写入和读取图片（c＃ asp.net sqlserver）
作者：木子? http://blog.csdn.net/derny/
首先要創建一個表包含自段image 和 type 類型各自為image 和 vnanchar
WebForm1.aspx
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="ReadAndWritePicFromDB.WebForm1" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <HTML> <HEAD> <title>WebForm1</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <FONT face="宋體"><INPUT id="File1" style="Z-INDEX: 101; LEFT: 112px; POSITION: absolute; TOP: 88px" type="file" name="File1" runat="server"></FONT> <asp:Button id="Button1" style="Z-INDEX: 102; LEFT: 400px; POSITION: absolute; TOP: 88px" runat="server" Text="Write" Width="104px"></asp:Button> <asp:Button id="Button2" style="Z-INDEX: 103; LEFT: 552px; POSITION: absolute; TOP: 88px" runat="server" Text="Read" Width="105px"></asp:Button> </form> </body> </HTML>
?
WebForm1.aspx.cs
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Data.SqlClient;
namespace ReadAndWritePicFromDB
{
?/// <summary>
?/// WebForm1 的摘要說明。
?/// </summary>
?public class WebForm1 : System.Web.UI.Page
?{
??protected System.Web.UI.HtmlControls.HtmlInputFile File1;
??protected System.Web.UI.WebControls.Button Button1;
??private string fileName = "" ;
??protected System.Web.UI.WebControls.Button Button2;
??private static SqlConnection conn? = null;
??
??private void Page_Load(object sender, System.EventArgs e)
??{
???// 在此處放置用戶代碼以初始化頁面
???ConnectDB();
??}
??//得到文件名
??private string GetFile()
??{
???HttpPostedFile file = File1.PostedFile;
???fileName = file.FileName;
???return fileName;
??}
??//讀取文件內容
??private byte[] ReadFile()
??{
???FileStream file = File.OpenRead(GetFile());
???byte[] content = new byte[file.Length];
???file.Read(content,0,content.Length);
???file.Close();
???
???return content;
??}
??//連接數據庫
??private void ConnectDB()
??{
???string connStr = "Initial Catalog=;Data Source=;User ID=;Password=;";
???conn = new SqlConnection(connStr);
???conn.Open();
??}
??//寫入圖片到數據庫中
??private void WriteImage()
??{
???SqlCommand comm = conn.CreateCommand();
???comm.CommandText = "insert into images(image,type) values(@image,@type)";
???comm.CommandType = CommandType.Text;
???SqlParameter param = comm.Parameters.Add("@image",SqlDbType.Image);
???param.Value = ReadFile();
???param = comm.Parameters.Add("@type",SqlDbType.NVarChar);
???param.Value = GetContentType(new FileInfo(fileName).Extension.Remove(0,1));
???if(comm.ExecuteNonQuery() == 1)
????Response.Write("Successful");
???else
????Response.Write("Fail");
???
???conn.Close();
??}
??//獲取圖片的后綴名
??private string GetContentType(string extension)
??{
???string type = "";
???if(extension.Equals("jpg") || extension.Equals("JPG"))
????type = "jpeg";
???else
????type = extension;
???return "image/"+type;
??}
??//從數據庫中讀取圖片
??private void ReadImage()
??{
???SqlCommand comm = conn.CreateCommand();
???comm.CommandText = "select image,type from images";
???comm.CommandType = CommandType.Text;
???SqlDataReader reader = comm.ExecuteReader();
???while(reader.Read())
???{
????Response.ContentType = reader["type"].ToString();//讀寫類型? 一定要設置 否則瀏覽器會當作文本輸出
????Response.BinaryWrite((byte[])reader["image"]);//圖片數據
???}
???Response.Write("Successful");
???Response.End();
???conn.Close();
??}
??#region Web 窗體設計器生成的代碼
??override protected void OnInit(EventArgs e)
??{
???//
???// CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
???//
???InitializeComponent();
???base.OnInit(e);
??}
??
??/// <summary>
??/// 設計器支持所需的方法 - 不要使用代碼編輯器修改
??/// 此方法的內容。
??/// </summary>
??private void InitializeComponent()
??{???
???this.Button1.Click += new System.EventHandler(this.Button1_Click);
???this.Button2.Click += new System.EventHandler(this.Button2_Click);
???this.Load += new System.EventHandler(this.Page_Load);
??}
??#endregion
??private void Button1_Click(object sender, System.EventArgs e)
??{
???WriteImage();
??}
??private void Button2_Click(object sender, System.EventArgs e)
??{
???try
???{
????ReadImage();
???}
???catch(Exception ep)
???{
????conn.Close();
????Response.End();
???}
??}
?}
}
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