ASP.NET NeatUpload是一个用于实现大文件上传的组件,它支持各种文件上传场景,并提供了丰富的API以适应不同的需求。下面将详细讲解如何使用该组件实现大文件上传的完整攻略。
1. 安装和配置
首先需要将NeatUpload组件添加到项目中。可使用NuGet安装或者手动下载添加。
Nuget安装:
Install-Package NeatUpload
手动添加:
从GitHub下载NeatUpload,将解压后的文件复制到项目目录中。在Web.config中添加以下节点:
<configuration>
<configSections>
<sectionGroup name="neatUpload">
<section name="uploadHttpModule"
type="Brettle.Web.NeatUpload.UploadHttpModuleSectionHandler,
Brettle.Web.NeatUpload" requirePermission="false" />
</sectionGroup>
</configSections>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true">
<add type="Brettle.Web.NeatUpload.UploadHttpModule,
Brettle.Web.NeatUpload" name="UploadHttpModule"/>
</modules>
</system.webServer>
<system.web>
<httpHandlers>
<add verb="POST" path="UploadHandler.axd"
type="Brettle.Web.NeatUpload.UploadHttpHandler,
Brettle.Web.NeatUpload"/>
</httpHandlers>
<httpModules>
<add type="Brettle.Web.NeatUpload.UploadHttpModule,
Brettle.Web.NeatUpload" name="UploadHttpModule"/>
</httpModules>
</system.web>
<neatUpload>
<uploadHttpModule maxRequestLength="10485760"/>
</neatUpload>
</configuration>
注:以上配置为ASP.NET 4.0。
2. 页面进行文件上传
在需要上传文件的页面中添加文件上传表单,如下所示:
<form action="~/Upload.aspx" method="post" enctype="multipart/form-data">
<input type="file" name="FileUpload1"/>
<input type="submit" value="Upload" />
</form>
其中action
属性指定提交表单时的处理页面,enctype
属性指定表单数据的编码格式, method
属性指定表单提交的方法。
3. 文件上传处理页面
在上一步中将表单提交到一个页面进行处理,下面是一个示例的处理逻辑:
<%@ Page Language="C#" %>
<%@ Import Namespace="System.IO" %>
<%@ Register TagPrefix="upload" Namespace="Brettle.Web.NeatUpload"
Assembly="Brettle.Web.NeatUpload" %>
<!DOCTYPE html>
<html>
<head runat="server">
<meta charset="utf-8" />
<title>Upload</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<upload:FileUpload ID="FileUpload1" runat="server" />
<asp:Button Text="Upload" runat="server" OnClick="UploadBtn_Click" />
</div>
</form>
</body>
</html>
using System;
using Brettle.Web.NeatUpload;
public partial class Upload : System.Web.UI.Page
{
protected void UploadBtn_Click(object sender, EventArgs e)
{
HttpPostedFile file = FileUpload1.PostedFile;
if (file.ContentLength > 0)
{
string fileName = Path.GetFileName(file.FileName);
string fileSavePath = Server.MapPath("~/UploadedFiles/") + fileName;
file.SaveAs(fileSavePath);
Response.Write("Upload Success!");
}
}
}
其中,<upload:FileUpload>
标签用于将表单数据绑定到服务器控件上,FileUpload1.PostedFile
获取上传的文件流,通过SaveAs()
方法保存至指定路径中。
示例2:通过Web API上传文件
using Brettle.Web.NeatUpload;
public class UploadController : ApiController
{
[HttpPost]
public async Task<HttpResponseMessage> Upload()
{
if (!Request.Content.IsMimeMultipartContent())
{
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
var provider = new MultipartMemoryStreamProvider();
await Request.Content.ReadAsMultipartAsync(provider);
foreach (var file in provider.Contents)
{
var fileName = file.Headers.ContentDisposition.FileName.Trim('\"');
var buffer = await file.ReadAsByteArrayAsync();
// Save file to disk
var path = Path.Combine("~/UploadedFiles/", fileName);
File.WriteAllBytes(path, buffer);
}
return Request.CreateResponse(HttpStatusCode.OK, "Upload Success!");
}
}
在Web API中使用MultipartMemoryStreamProvider
来处理上传的文件,可以同时读取并保存多个文件。根据请求的Content-Type判断是否为上传文件的请求,然后提取文件流并获取文件名,最后保存至指定路径。
总结
通过以上示例,我们可以使用ASP.NET NeatUpload组件实现大文件上传。无论是通过页面POST请求上传到处理页面,还是通过Web API方式上传文件,都可以使用该组件轻松实现。
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