C# ASP.NET使用ashx一般处理程序实现上传文件功能-C/S开发框架

原来以为文件上传是一个比较简单的功能，结果搞了一个晚上才搞定~这里主要介绍两种方法实现。

方法一：Form表单提交

html代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>上传文件</title>
    <script src="Scripts/jquery-1.11.3.min.js"></script>
</head>
<body>
    <form action="UploadHandler.ashx" method="post" enctype="multipart/form-data">
        <input id="file_upload" name="file_upload" type="file" />
        <input id="btn_upload" type="submit" value="上传" />
    </form>
</body>
</html>

UploadHandler.ashx代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApplication1
{
    /// <summary>
    /// UploadHandler 的摘要说明
    /// </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("上传文件成功");
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

该方法虽然能够实现文件的上传，但是form表单提交之后整个页面就刷新了，如果要无刷新上传文件的话，就要使用ajax了。

方法二：jquery + ajax无刷上传

html代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>上传文件</title>
    <script src="Scripts/jquery-1.11.3.min.js"></script>
</head>
<body>
    <input id="file_upload" name="file_upload" type="file" />
    <input id="btn_upload" type="button" value="上传" />

    <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('文件上传成功');
                        }
                        else
                        {
                            alert('文件上传失败');
                        }
                    }
                })
            });
        });
    </script>
</body>
</html>

UploadHandler.ashx代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApplication1
{
    /// <summary>
    /// UploadHandler 的摘要说明
    /// </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;
            }
        }
    }
}

个人更推荐方法二，运行结果如下图所示：

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