asp.net 中使用JQuery Ajax 上传文件

<

h3

>Upload
File using Jquery AJAX in Asp.net</

h3

> 

<

table

> 

<

tr

> 

<

td

>File:</

td

> 

<

td

> 

<

asp:FileUpload

ID="fupload"
runat="server"  onchange='prvimg.UpdatePreview(this)' /></

td

> 

<

td

><

asp:Image

ID="imgprv"
runat="server" Height="90px" Width="75px"  /></

td

> 

</

tr

> 

<

tr

> 

<

td

></

td

> 

<

td

><

asp:Button

ID="btnUpload"
runat="server" cssClass="button" Text="Upload Selected File" /></

td

> 

</

tr

> 

</

table

> 

$("#btnUpload").click(function (evt) {
var fileUpload = $("#fupload").get(0);
var files = fileUpload.files;

var data = new FormData();
for (var i = 0; i < files.length; i++) {
data.append(files[i].name, files[i]);
}

$.ajax({
url: "FileUploadHandler.ashx",
type: "POST",
data: data,
contentType: false,
processData: false,
dataType: "json",
success: function (rs)
{
var t = eval(rs);
alert(t.msg);
}
});

evt.preventDefault();
});

<%@ WebHandler Language="C#" Class="FileUploadHandler" %>

using System;
using System.Web;

public class FileUploadHandler : IHttpHandler
{

public void ProcessRequest (HttpContext context)
{
if (context.Request.Files.Count > 0)
{
HttpFileCollection files = context.Request.Files;
for (int i = 0; i < files.Count; i++)
{
HttpPostedFile file = files[i];
string fname = context.Server.MapPath("/") + file.FileName;
file.SaveAs(fname);
}
context.Response.ContentType = "text/plain";    

string json = "{\"success\":\"true\",\"result\":\"success\",\"msg\":\"上传成功\"}";
context.Response.Write(json );
}

}

public bool IsReusable
{
get
{
return false;
}
}

}