c# 文件上传下载

1. 介绍

C#文件上传下载用WebClient类实现

微软官方使用Demo

https://docs.microsoft.com/en-us/dotnet/api/system.net.webclient.downloadfile?view=netframework-4.7.2

架构为B/S

模板

服务器: WebForm

客户端:ConsoleApplication

2. 代码

2.1 客户端

解决方案:

WebClientOper.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;

namespace WebClientOperation
{
class WebClientOper
{
public bool UploadFile(string address, string fileName)
{
if (!File.Exists(fileName))
return false;

using (WebClient client = new WebClient())
{
client.UploadProgressChanged += Client_UploadProgressChanged; ;
client.UploadFileCompleted += Client_UploadFileCompleted; ;
client.UploadFileAsync(new Uri(address), fileName);

Console.ReadKey();
}

return true;
}

private void Client_UploadFileCompleted(object sender, UploadFileCompletedEventArgs e)
{
Console.WriteLine("Upload Completed...");
}

private void Client_UploadProgressChanged(object sender, UploadProgressChangedEventArgs e)
{
Console.WriteLine($"{e.ProgressPercentage}:{e.BytesReceived}/{e.TotalBytesToReceive}");
}

public bool DownloadFile(string address, string fileName)
{
using (WebClient client = new WebClient())
{
client.DownloadProgressChanged += Client_DownloadProgressChanged; ;
client.DownloadFileCompleted += Client_DownloadFileCompleted;
client.DownloadFileAsync(new Uri(address), fileName);

Console.ReadKey();
}

return true;
}

private void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
Console.WriteLine("Download Completed...");
}

private void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
Console.WriteLine($"{e.ProgressPercentage}:{e.BytesReceived}/{e.TotalBytesToReceive}");
}

public void DisplayImage()
{

}
}
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WebClientOperation
{
class Program
{
static void Main(string[] args)
{
Test();
}

static void Test()
{
string filePath = @"E:\sky.jpg";

// IIS Upload
// string address = @"http://localhost:22903/WebServer.aspx";
// IIS Download
// pic path = "C:\Users\Irvin\source\repos\WebServer\WebServer\sky.jpg"
string address = @"http://localhost:22903/WebServer.aspx/sky.jpg";

WebClientOper webClientOper = new WebClientOper();
// webClientOper.UploadFile(address, filePath);
webClientOper.DownloadFile(address, filePath);
}
}
}

2.2 服务器:

创建空web项目

添加网站WebServer

解决方案

WebServer.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="WebServer.aspx.cs" Inherits="WebServer" %>

<!DOCTYPE html>

WebServer.aspx.cs

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

public partial class WebServer : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
foreach (string f in Request.Files.AllKeys)
{
HttpPostedFile file = Request.Files[f];
file.SaveAs("E:\\UploadedFiles\\" + file.FileName);
}
}
}

3. 测试

3.1 上传测试

修改上传URL为服务器主页URL, 启动服务器,拷贝并修改address