C#文件上传类

using System;

namespace UpFile
{
/// <summary>
/// upfile 的摘要说明。
/// </summary>
public class upfile
{
private string path = null;
private string fileType = null;
private int sizes = 0;
/// <summary>
/// 初始化变量
/// </summary>
public upfile()
{
path = @"/uploadimages/"; //上传路径
fileType = "jpg|gif|bmp";
sizes = 200; //传文件的大小,默认200KB
}

/// <summary>
/// 设置上传路径,如:uploadimages/
/// </summary>
public string Path
{
set
{
path = @"/" + value + @"/";
}
}

/// <summary>
/// 设置上传文件大小,单位为KB
/// </summary>
public int Sizes
{
set
{
sizes = value * 1024;
}
}

/// <summary>
/// 设置上传文件的类型,如:jpg|gif|bmp
/// </summary>
public string FileType
{
set
{
fileType = value;
}
}

/// <summary>
/// 上传图片
/// </summary>
/// <param name="name">上传控件名称</param>
/// <param name="creatDirectory">true则以当前时间创建文件夹,false则为设置的文件夹</param>
/// <returns>返回上传图片的相对路径</returns>
public string fileSaveAs(System.Web.UI.HtmlControls.HtmlInputFile name,bool creatDirectory)
{
try
{
string filePath=null;
//以当前时间修改图片的名字或创建文件夹的名字
string modifyFileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString();
//获得站点的物理路径
string uploadFilePath = null;
//如果为true则以当前时间创建文件夹,否则为设置的文件夹
if(creatDirectory)
{
uploadFilePath = System.Web.HttpContext.Current.Server.MapPath(".") + @"/" + DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + @"/";
}
else
{
uploadFilePath = System.Web.HttpContext.Current.Server.MapPath(".") + path;
}
//获得文件的上传的路径
string sourcePath=name.Value.Trim();
//判断上传文件是否为空
if(sourcePath == "" || sourcePath == null)
{
message("您没有上传数据呀，是不是搞错了呀!");
return null;
}
//获得文件扩展名
string tFileType = sourcePath.Substring(sourcePath.LastIndexOf(".")+1);
//获得上传文件的大小
long strLen = name.PostedFile.ContentLength;
//分解允许上传文件的格式
string[] temp = fileType.Split('|');
//设置上传的文件是否是允许的格式
bool flag = false;
//判断上传文件大小
if(strLen >= sizes)
{

message("上传的图片不能大于" + sizes + "KB");
return null;
}
//判断上传的文件是否是允许的格式
foreach(string data in temp)
{
if(data == tFileType)
{
flag = true ;
break;
}
}
//如果为真允许上传,为假则不允许上传
if(!flag)
{
message("目前本系统支持的格式为:"+fileType);
return null;
}
System.IO.DirectoryInfo dir=new System.IO.DirectoryInfo(uploadFilePath);
//判断文件夹否存在,不存在则创建
if(!dir.Exists)
{
dir.Create();
}
filePath = uploadFilePath + modifyFileName + "." + tFileType;
name.PostedFile.SaveAs(filePath);
filePath = path + modifyFileName + "." + tFileType;

return filePath;

}
catch
{
//异常
message("出现未知错误！");
return null;
}
}

private void message(string msg,string url)
{
System.Web.HttpContext.Current.Response.Write("<script language=javascript>alert('"+msg+"');window.location='"+url+"'</script>");
}

private void message(string msg)
{
System.Web.HttpContext.Current.Response.Write("<script language=javascript>alert('"+msg+"');</script>");
}
}
}