VS2005中使用FileUpload控件上传图片并自动生成缩略图(原创)
2006-05-05 19:03
736 查看
本文借助vs2005中自带的FileUpload控件实现图片文件的上传并生成缩略图。
实现过程:选择图片上传成功后,取得已经存在服务器的文件生成缩略图,并且判断是否是图片类型的文件,这个的判断可以在程序中修改,本程序只是判断了“image/bmp”、“image/gif”、“image/pjpeg”三种类型。
代码如下:
upfile.aspx文件
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
<%
![](http://www.cnblogs.com/Images/dot.gif)
@ Page Language="C#" AutoEventWireup="true" CodeFile="upfile.aspx.cs" Inherits="upfile_upfile" %>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<html xmlns="http://www.w3.org/1999/xhtml" >
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<head runat="server">
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<title>无标题页</title>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</head>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<body>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<form id="form1" runat="server">
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<div>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<asp:FileUpload ID="FileUpload1" runat="server" />
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<asp:Label ID="Label1" runat="server"></asp:Label></div>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</form>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</body>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</html>
upfile.aspx.cs文件
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.Security;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI.WebControls;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI.WebControls.WebParts;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI.HtmlControls;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.IO;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
public partial class upfile_upfile : System.Web.UI.Page
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected void Page_Load(object sender, EventArgs e)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected void Button1_Click(object sender, EventArgs e)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (FileUpload1.HasFile)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileContentType = FileUpload1.PostedFile.ContentType;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
FileInfo file = new FileInfo(name);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileName = file.Name; // 文件名称
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileName_s = "s_" + file.Name; // 缩略图文件名称
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string webFilePath = Server.MapPath("file/" + fileName); // 服务器端文件路径
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string webFilePath_s = Server.MapPath("file/" + fileName_s); // 服务器端缩略图路径
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (!File.Exists(webFilePath))
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成缩略图方法
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件“" + fileName + "”成功上传,并生成“" + fileName_s + "”缩略图,文件类型为:" + FileUpload1.PostedFile.ContentType + ",文件大小为:" + FileUpload1.PostedFile.ContentLength + "B";
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件上传失败,失败原因:" + ex.Message;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件已经存在,请重命名后上传";
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件类型不符";
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 生成缩略图
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="originalImagePath">源图路径(物理路径)</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="thumbnailPath">缩略图路径(物理路径)</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="width">缩略图宽度</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="height">缩略图高度</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <param name="mode">生成缩略图的方式</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int towidth = width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int toheight = height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int x = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int y = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int ow = originalImage.Width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int oh = originalImage.Height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
switch (mode)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "HW"://指定高宽缩放(可能变形)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "W"://指定宽,高按比例
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
toheight = originalImage.Height * width / originalImage.Width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "H"://指定高,宽按比例
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
towidth = originalImage.Width * height / originalImage.Height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "Cut"://指定高宽裁减(不变形)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
oh = originalImage.Height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ow = originalImage.Height * towidth / toheight;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
y = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
x = (originalImage.Width - ow) / 2;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ow = originalImage.Width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
oh = originalImage.Width * height / towidth;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
x = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
y = (originalImage.Height - oh) / 2;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
default:
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//新建一个bmp图片
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//新建一个画板
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//设置高质量插值法
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//设置高质量,低速度呈现平滑程度
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//清空画布并以透明背景色填充
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.Clear(System.Drawing.Color.Transparent);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//在指定位置并且按指定大小绘制原图片的指定部分
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
new System.Drawing.Rectangle(x, y, ow, oh),
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.GraphicsUnit.Pixel);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//以jpg格式保存缩略图
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (System.Exception e)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
throw e;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
finally
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
originalImage.Dispose();
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bitmap.Dispose();
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.Dispose();
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
实现过程:选择图片上传成功后,取得已经存在服务器的文件生成缩略图,并且判断是否是图片类型的文件,这个的判断可以在程序中修改,本程序只是判断了“image/bmp”、“image/gif”、“image/pjpeg”三种类型。
代码如下:
upfile.aspx文件
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
<%
![](http://www.cnblogs.com/Images/dot.gif)
@ Page Language="C#" AutoEventWireup="true" CodeFile="upfile.aspx.cs" Inherits="upfile_upfile" %>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<html xmlns="http://www.w3.org/1999/xhtml" >
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<head runat="server">
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<title>无标题页</title>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</head>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<body>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<form id="form1" runat="server">
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<div>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<asp:FileUpload ID="FileUpload1" runat="server" />
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
<asp:Label ID="Label1" runat="server"></asp:Label></div>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</form>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</body>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
</html>
upfile.aspx.cs文件
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.Security;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI.WebControls;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI.WebControls.WebParts;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web.UI.HtmlControls;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.IO;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
public partial class upfile_upfile : System.Web.UI.Page
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected void Page_Load(object sender, EventArgs e)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected void Button1_Click(object sender, EventArgs e)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (FileUpload1.HasFile)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileContentType = FileUpload1.PostedFile.ContentType;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
FileInfo file = new FileInfo(name);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileName = file.Name; // 文件名称
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileName_s = "s_" + file.Name; // 缩略图文件名称
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string webFilePath = Server.MapPath("file/" + fileName); // 服务器端文件路径
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string webFilePath_s = Server.MapPath("file/" + fileName_s); // 服务器端缩略图路径
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (!File.Exists(webFilePath))
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成缩略图方法
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件“" + fileName + "”成功上传,并生成“" + fileName_s + "”缩略图,文件类型为:" + FileUpload1.PostedFile.ContentType + ",文件大小为:" + FileUpload1.PostedFile.ContentLength + "B";
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件上传失败,失败原因:" + ex.Message;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件已经存在,请重命名后上传";
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Label1.Text = "提示:文件类型不符";
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 生成缩略图
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="originalImagePath">源图路径(物理路径)</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="thumbnailPath">缩略图路径(物理路径)</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="width">缩略图宽度</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="height">缩略图高度</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <param name="mode">生成缩略图的方式</param>
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int towidth = width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int toheight = height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int x = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int y = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int ow = originalImage.Width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int oh = originalImage.Height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
switch (mode)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "HW"://指定高宽缩放(可能变形)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "W"://指定宽,高按比例
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
toheight = originalImage.Height * width / originalImage.Width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "H"://指定高,宽按比例
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
towidth = originalImage.Width * height / originalImage.Height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "Cut"://指定高宽裁减(不变形)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
oh = originalImage.Height;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ow = originalImage.Height * towidth / toheight;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
y = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
x = (originalImage.Width - ow) / 2;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ow = originalImage.Width;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
oh = originalImage.Width * height / towidth;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
x = 0;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
y = (originalImage.Height - oh) / 2;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
default:
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//新建一个bmp图片
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//新建一个画板
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//设置高质量插值法
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//设置高质量,低速度呈现平滑程度
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//清空画布并以透明背景色填充
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.Clear(System.Drawing.Color.Transparent);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//在指定位置并且按指定大小绘制原图片的指定部分
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
new System.Drawing.Rectangle(x, y, ow, oh),
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.GraphicsUnit.Pixel);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//以jpg格式保存缩略图
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (System.Exception e)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
throw e;
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
finally
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
originalImage.Dispose();
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bitmap.Dispose();
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.Dispose();
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://weekzero.cnblogs.com/Images/OutliningIndicators/None.gif)
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