asp.NetUpdatePanel更新なしアップロード画像を実現
4885 ワード
1)フロント
<br/>
<br/>
<br/><form id="form1" runat="server">
<br/><div>
<br/><updatepanel id="UpdatePanel1" runat="server" updatemode="Conditional">
<br/><contenttemplate>
<br/><scriptmanager id="ScriptManager1" runat="server">
<br/></scriptmanager>
<br/><button id="Button1" runat="server" onclick="Button1_Click" text="Button"/>
<br/><fileupload id="File1" runat="server" width="200px"/>
<br/></contenttemplate>
<br/><triggers>
<br/><postbacktrigger controlid="Button1"/>
<br/></triggers>
<br/></updatepanel>
<br/><image id="image1" imageurl="http://images.cnblogs.com/nopic.gif" height="115px" width="108px" runat="server"/>
<br/></div>
<br/></form>
<br/>
<br/>
<br/>
</code></pre>
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<strong>2） </strong>
<br/>
<pre><code>
<br/>using System;
<br/>using System.Collections.Generic;
<br/>using System.Linq;
<br/>using System.Web;
<br/>using System.Web.UI;
<br/>using System.Web.UI.WebControls;
<br/>using System.IO;
<br/>using System.Data.SqlClient;
<br/>using System.Data;
<br/>public partial class _Default:baseClass
<br/>{
<br/>protected void Page_Load(object sender, EventArgs e)
<br/>{
<br/>}
<br/>protected void Button1_Click(object sender, EventArgs e)
<br/>{
<br/>HttpPostedFile upFile = File1.PostedFile;
<br/>int iFileLength = upFile.ContentLength;
<br/>try
<br/>{
<br/>if (iFileLength == 0)
<br/>{
<br/>MessageBox(" ！");
<br/>}
<br/>else
<br/>{
<br/>Byte[] FileByteArray = new Byte[iFileLength];
<br/>Stream StreamObject = upFile.InputStream;
<br/>StreamObject.Read(FileByteArray, 0, iFileLength);
<br/>SqlConnection conn = new SqlConnection("server=.;database=Test;uid=sa;pwd=1234;");
<br/>ExecuteBySQLNonQuery("delete from imageTable");
<br/>SqlCommand cmd = new SqlCommand("insert into [imageTable] values(@image)", conn);
<br/>cmd.Parameters.Add("@Image", SqlDbType.Binary, iFileLength).Value = FileByteArray;
<br/>conn.Open();
<br/>cmd.ExecuteNonQuery();
<br/>conn.Close();
<br/>MessageBox(" !");
<br/>}
<br/>image1.ImageUrl = "displayempphoto.ashx";
<br/>}
<br/>catch (Exception ex)
<br/>{
<br/>MessageBox(ex.Message);
<br/>}
<br/>}
<br/>}
<br/>
</code></pre>
<br/>
<strong>3） displayempphoto.ashx</strong>
<br/>
<pre><code>
<br/>
<br/>using System;
<br/>using System.Web;
<br/>using System.Data.SqlClient;
<br/>using System.Web.Configuration;
<br/>using System.Data;
<br/>public class DisplayEmpPhoto : IHttpHandler
<br/>{
<br/>public void ProcessRequest(HttpContext context)
<br/>{
<br/>using (SqlConnection cn = new SqlConnection(WebConfigurationManager.ConnectionStrings["CONNECTIONSQL"].ConnectionString))
<br/>{
<br/>SqlCommand SQLCmd = cn.CreateCommand();
<br/>SQLCmd.CommandText = "SELECT imagedata FROM imageTable";
<br/>cn.Open();
<br/>using (SqlDataReader dr = SQLCmd.ExecuteReader(CommandBehavior.SingleRow))
<br/>{
<br/>if (dr.Read())
<br/>{
<br/>// HTTP ， JPEG 。
<br/>context.Response.ContentType = "Image/JPEG";
<br/>context.Response.Clear();
<br/>context.Response.BufferOutput = true;
<br/>context.Response.BinaryWrite(dr.GetSqlBytes(0).Value);
<br/>}
<br/>}
<br/>}
<br/>}
<br/>public bool IsReusable
<br/>{
<br/>get
<br/>{
<br/>return false;
<br/>}
<br/>}
<br/>}
<br/>
</code></pre>
<div class="clearfix">
<span id="art_bot" class="jbTestPos"/>
</div>
</div>
</div>
</div>