摘要:[ASP.NET] 在頁面上顯示上傳的圖片
這幾天同事剛好遇到一個問題
想要讀取圖片並顯示在頁面上
因此小弟做了一個範例
順便做個紀錄
#前台程式碼...建立上傳檔案頁面
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="A3.aspx.cs" Inherits="A3" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload runat="server" ID="filMyFile" />
<asp:Button Text="Click" ID="btn_Go" UseSubmitBehavior="false" runat="server" OnClick="btn_Go_Click" />
<br />
<asp:Image runat="server" ID="img" />
</div>
</form>
</body>
</html>
// 後台程式碼
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class A3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btn_Go_Click(object sender, EventArgs e)
{
if (filMyFile.PostedFile != null)
{
////1. 圖片直接顯示在本頁面上
//// File was sent
//HttpPostedFile myFile = filMyFile.PostedFile;
//// 抓取上傳檔案的大小
//int nFileLen = myFile.ContentLength;
//// 設定buffer大小
//byte[] myData = new byte[nFileLen];
//myFile.InputStream.Read(myData, 0, nFileLen);
//Response.Clear();
//Response.ContentType = "image/jpeg";
//Response.BinaryWrite(myData);
//2. 圖片顯示在IMAGE的控件上
// File was sent
HttpPostedFile myFile = filMyFile.PostedFile;
Session["myFile"] = myFile;
// Set ImageUrl
img.ImageUrl = "showImage.ashx";
}
}
}
// 建立showImage.ashx
<%@ WebHandler Language="C#" Class="showImage" %>
using System;
using System.Web;
using System.Web.SessionState;
public class showImage : IHttpHandler, IRequiresSessionState
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
context.Response.Write("Hello World");
if (context.Session["myFile"] != null)
{
HttpPostedFile myFile = (HttpPostedFile)context.Session["myFile"];
int nFileLen = myFile.ContentLength;
// Allocate a buffer for reading of the file
byte[] myData = new byte[nFileLen];
myFile.InputStream.Read(myData, 0, nFileLen);
context.Response.Clear();
context.Response.ContentType = "image/jpeg";
context.Response.BinaryWrite(myData);
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
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