原來以為文件上傳是一個比較簡單的功能，結果搞了一個晚上才搞定~這里主要介紹兩種方法實現。
方法一：Form表單提交
html代碼：
<!DOCTYPE html><html><head> <meta charset="utf-8" /> <title>上傳文件</title> <script src="Scripts/jquery-1.11.3.min.js"></script></head><body> <form action="UploadHandler.ashx" method="post" enctype="multipart/form-data"> <input name="file_upload" type="file" /> <input type="submit" value="上傳" /> </form></body></html>
UploadHandler.ashx代碼：
using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace WebApplication1{ /// <summary> /// UploadHandler 的摘要說明 /// </summary> public class UploadHandler : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; HttpPostedFile file = context.Request.Files["file_upload"]; string filePath = context.Server.MapPath("~/UploadFiles/") + System.IO.Path.GetFileName(file.FileName); file.SaveAs(filePath); context.Response.Write("上傳文件成功"); } public bool IsReusable { get { return false; } } }}該方法雖然能夠實現文件的上傳，但是form表單提交之后整個頁面就刷新了，如果要無刷新上傳文件的話，就要使用ajax了。
方法二：jquery + ajax無刷上傳
html代碼：
<!DOCTYPE html><html><head> <meta charset="utf-8" /> <title>上傳文件</title> <script src="Scripts/jquery-1.11.3.min.js"></script></head><body> <input name="file_upload" type="file" /> <input type="button" value="上傳" /> <script> $(document).ready(function () { $('#btn_upload').bind('click', function () { var formData = new FormData(); formData.append('upload_file', $('#file_upload')[0].files[0]); $.ajax({ url: 'UploadHandler.ashx', type: 'post', data: formData, contentType: false, processData: false, success: function (msg) { if (msg == "Yes") { alert('文件上傳成功'); } else { alert('文件上傳失敗'); } } }) }); }); </script></body></html>UploadHandler.ashx代碼：
using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace WebApplication1{ /// <summary> /// UploadHandler 的摘要說明 /// </summary> public class UploadHandler : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; if (context.Request.Files.Count > 0) { HttpPostedFile file = context.Request.Files["upload_file"]; string filePath = context.Server.MapPath("~/UploadFiles/") + System.IO.Path.GetFileName(file.FileName); file.SaveAs(filePath); context.Response.Write("Yes"); } else { context.Response.Write("No"); } } public bool IsReusable { get { return false; } } }}
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