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最近自己做項目的時候需要添加一個功能，上傳用戶的圖片，上傳用戶圖片其實涉及到很多東西，不只是一個html標簽<input id="File1" type="file" />或者asp.net封住好的FileUpload 控件，現在網站不再講究的是功能性，更多的是用戶體驗性，在這里上傳圖片就需要用到ajax無刷新上傳圖片，這里面包含的東西不是一點半點。這里用到的是一個插件swfupload 實現無刷新上傳圖片。直接上傳我的代碼供大家參考。

前臺代碼區：

復制代碼代碼如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ChangeAvatar.aspx.cs" Inherits="NovelChannel.ChangeAvatar" %>
<!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>
<link href="/CSS/jQueryUI/jquery-ui-1.10.2.custom.css" rel="stylesheet" type="text/css" />
<style type="text/css">
#draggable
{
width:50px;
height:50px;
padding:0.5em;
}
</style>
<script src="/JS/jQuery/jquery-1.9.1.js" type="text/javascript"></script>
<script src="/JS/jQuery/jquery-ui-1.10.2.custom.js" type="text/javascript"></script>
<script type="text/javascript" src="/JS/swf/swfupload.js"></script>
<script type="text/javascript" src="/JS/swf/handlers.js"></script>
<script type="text/javascript">
function uploadImgSuccess(file, response) {
//$("#imgAvatar").attr("src", response + "?ts=" + new Date());
//"url("+response + "?ts="+ new Date()+")")
var strs = $.parseJSON(response);
var imgPath = strs[0];
var imgWidth = strs[1];
var imgHeight = strs[2];
$("#avatarContainer").css("background-image", "url(" + imgPath + ")");
$("#avatarContainer").css("width", imgWidth + "px").css("height", imgHeight+"px");
};
$(function () {
var swfu;
swfu = new SWFUpload({
// Backend Settings
upload_url: "/Ajax/UploadAvatar.ashx",
post_params: {
"ASPSESSID": "<%=Session.SessionID %>"
},
// File Upload Settings
file_size_limit: "2 MB",
file_types: "*.jpg",
file_types_description: "JPG Images",
file_upload_limit: 0, // Zero means unlimited
// Event Handler Settings - these functions as defined in Handlers.js
// The handlers are not part of SWFUpload but are part of my website and control how
// my website reacts to the SWFUpload events.
swfupload_preload_handler: preLoad,
swfupload_load_failed_handler: loadFailed,
file_queue_error_handler: fileQueueError,
file_dialog_complete_handler: fileDialogComplete,
upload_progress_handler: uploadProgress,
upload_error_handler: uploadError,
upload_success_handler: uploadImgSuccess,
upload_complete_handler: uploadComplete,
// Button settings
button_image_url: "/JS/swf/images/XPButtonNoText_160x22.png",
button_placeholder_id: "btnUploadImgPlaceholder",
button_width: 160,
button_height: 22,
button_text: '<span class="button">選擇圖片（最大2MB）</span>',
button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',
button_text_top_padding: 1,
button_text_left_padding: 5,
// Flash Settings
flash_url: "/JS/swf/swfupload.swf", // Relative to this file
flash9_url: "/JS/swf/swfupload_FP9.swf", // Relative to this file
custom_settings: {
upload_target: "divFileProgressContainer"
},
// Debug Settings
debug: false
});
});
$(function () {
$("#draggable").draggable({ containment: "parent" },
{ cursor: "crosshair" });
$("#draggable").dblclick(function () {
var thisOffset = $(this).offset();//獲取改容器的坐標位置
var parentOffset = $(this).parent().offset(); //獲取父容器的坐標位置
var left = thisOffset.left - parentOffset.left;//得到相對于父窗體的相對位置
var top = thisOffset.top - parentOffset.top; //得到相對于父窗體的相對位置
alert(left+" "+top);
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<span id="btnUploadImgPlaceholder"></span>
<div id="divFileProgressContainer"></div>
<br />
<div id="avatarContainer" style="width:200px;height:300px">
<div id="draggable" style="background-color:transparent;border-width:1px;border-color:Black;border-style:solid;">
拖過
</div>
</div>
<img id="imgAvatar" style="display:none;"/>
</div>
</form>
</body>
</html>

后臺一般處理程序區：
（UploadAvatar.ashx）

復制代碼代碼如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Drawing;
using System.Web.Script.Serialization;
using System.Drawing.Drawing2D;
namespace NovelChannel.Ajax
{
/// <summary>
/// UploadAvatar 的摘要說明
/// </summary>
public class UploadAvatar : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
//context.Response.Write("Hello World");
HttpPostedFile uploadFile = context.Request.Files["FileData"];
string ext = Path.GetExtension(uploadFile.FileName);
if (ext != ".jpg")
{
context.Response.Write("非法的文件類型");
return;
}
string fileName = DateTime.Now.ToString("yyMMddhhMMss") + new Random().Next(1000, 9999) +".jpg";
string filePath = "/Images/UserImg/" + fileName;
string fullPath = HttpContext.Current.Server.MapPath("~" + filePath);
uploadFile.SaveAs(fullPath);
System.Drawing.Image img = Bitmap.FromFile(fullPath);
string[] strs={filePath,img.Size.Width.ToString(),img.Size.Height.ToString()};
JavaScriptSerializer jss=new JavaScriptSerializer ();
string json=jss.Serialize(strs);
context.Response.Write(json);
}
public bool IsReusable
{
get
{
return false;
}
}
}
}