C# winform 上传图片 显示图片

原创作品，允许转载，转载时请务必以超链接形式标明文章
原始出处 、作者信息和本声明。否则将追究法律责任。http://long7s.blog.51cto.com/2889364/587090

最近正在用C#做一个小的程序，其中用涉及到了照片的存取与显示，在网上搜索了很多有关的代码，但是几乎没有完整，大部分只是其中的存取或者显示代码，笔者将其整理了一下，形成了一个集照片上传到数据库、照片显示于一体的小模块。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Data.SqlClient;

namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//选择按钮事件处理
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.InitialDirectory = "C:\\";
openFileDialog1.Filter = "图片文件 (*.jpg)|*.jpg";
openFileDialog1.FilterIndex = 1;
openFileDialog1.RestoreDirectory = true;
openFileDialog1.Multiselect = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
textBox1.Text = openFileDialog1.FileName;
}
}
//上传按钮事件处理
private void button2_Click(object sender, EventArgs e)
{
Save(PhotoToArray(textBox1.Text.ToString()));
}
//将图片信息转换成二进制信息
private byte[] PhotoToArray(string path)
{
FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read);
byte[] bufferPhoto = new byte[stream.Length];
stream.Read(bufferPhoto, 0, Convert.ToInt32(stream.Length));
stream.Flush();
stream.Close();
return bufferPhoto;
}
//把二进制的图片插到数据库
private void Save(byte[] image)
{
string sql = "insert into Photo(photo_Info) values(@photo)";
SqlParameter param = new SqlParameter();
param = new SqlParameter("@photo", SqlDbType.Image);
param.Value = image;
SqlCommand commd = new SqlCommand(sql, DBhelper.con);
commd.Parameters.Add(param);
try
{
DBhelper.con.Open();
commd.ExecuteNonQuery();
MessageBox.Show("您已经把图片成功的插入数据库！");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
DBhelper.con.Close();
}
}
//显示图片按钮事件处理
private void button3_Click(object sender, EventArgs e)
{
string strSQL = "Select   [photo_Info]   From   [Photo]   Where   [photo_Id]=(@photo)";
SqlParameter param = new SqlParameter();
param = new SqlParameter("@photo", SqlDbType.Int);
param.Value = comboBox1.Text.ToString();
SqlCommand cmd = new SqlCommand(strSQL, DBhelper.con);
cmd.Parameters.Add(param);
DBhelper.con.Open();
System.Data.SqlClient.SqlDataReader reader = cmd.ExecuteReader();
try
{
reader.Read();
MemoryStream ms = new MemoryStream((byte[])reader["photo_Info"]);
System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
this.pictureBox1.Image = image;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
DBhelper.con.Close();
}
}
private void Form1_Load(object sender, EventArgs e)
{
// TODO: 这行代码将数据加载到表“myPhotoDataSet.Photo”中。您可以根据需要移动或移除它。
this.photoTableAdapter.Fill(this.myPhotoDataSet.Photo);
}
}
}