从URL路径下载文件的简单方法是什么?
当前回答
根据我的研究,我发现WebClient。DownloadFileAsync是下载文件的最佳方式。可以在系统中找到。Net命名空间,它也支持。Net core。
下面是下载该文件的示例代码。
using System;
using System.IO;
using System.Net;
using System.ComponentModel;
public class Program
{
public static void Main()
{
new Program().Download("ftp://localhost/test.zip");
}
public void Download(string remoteUri)
{
string FilePath = Directory.GetCurrentDirectory() + "/tepdownload/" + Path.GetFileName(remoteUri); // path where download file to be saved, with filename, here I have taken file name from supplied remote url
using (WebClient client = new WebClient())
{
try
{
if (!Directory.Exists("tepdownload"))
{
Directory.CreateDirectory("tepdownload");
}
Uri uri = new Uri(remoteUri);
//password username of your file server eg. ftp username and password
client.Credentials = new NetworkCredential("username", "password");
//delegate method, which will be called after file download has been complete.
client.DownloadFileCompleted += new AsyncCompletedEventHandler(Extract);
//delegate method for progress notification handler.
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgessChanged);
// uri is the remote url where filed needs to be downloaded, and FilePath is the location where file to be saved
client.DownloadFileAsync(uri, FilePath);
}
catch (Exception)
{
throw;
}
}
}
public void Extract(object sender, AsyncCompletedEventArgs e)
{
Console.WriteLine("File has been downloaded.");
}
public void ProgessChanged(object sender, DownloadProgressChangedEventArgs e)
{
Console.WriteLine($"Download status: {e.ProgressPercentage}%.");
}
}
以上代码文件将下载到项目目录下的tepdownload文件夹中。请阅读代码中的注释以了解以上代码的功能。
其他回答
在.NET Core MVC中,你有时可以简单地这样做:
public async Task<ActionResult> DownloadUrl(string url) {
return Redirect(url);
}
这可能假设您正在尝试下载的MIME类型被浏览器设置为可下载(例如.mp4),因此它不会尝试重定向到网页。
使用GetIsNetworkAvailable()检查网络连接,以避免在未连接到网络时创建空文件。
if (System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
{
using (System.Net.WebClient client = new System.Net.WebClient())
{
client.DownloadFileAsync(new Uri("http://www.examplesite.com/test.txt"),
"D:\\test.txt");
}
}
下面的代码包含下载文件的逻辑与原始名称
private string DownloadFile(string url)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
string filename = "";
string destinationpath = Environment;
if (!Directory.Exists(destinationpath))
{
Directory.CreateDirectory(destinationpath);
}
using (HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result)
{
string path = response.Headers["Content-Disposition"];
if (string.IsNullOrWhiteSpace(path))
{
var uri = new Uri(url);
filename = Path.GetFileName(uri.LocalPath);
}
else
{
ContentDisposition contentDisposition = new ContentDisposition(path);
filename = contentDisposition.FileName;
}
var responseStream = response.GetResponseStream();
using (var fileStream = File.Create(System.IO.Path.Combine(destinationpath, filename)))
{
responseStream.CopyTo(fileStream);
}
}
return Path.Combine(destinationpath, filename);
}
根据我的研究,我发现WebClient。DownloadFileAsync是下载文件的最佳方式。可以在系统中找到。Net命名空间,它也支持。Net core。
下面是下载该文件的示例代码。
using System;
using System.IO;
using System.Net;
using System.ComponentModel;
public class Program
{
public static void Main()
{
new Program().Download("ftp://localhost/test.zip");
}
public void Download(string remoteUri)
{
string FilePath = Directory.GetCurrentDirectory() + "/tepdownload/" + Path.GetFileName(remoteUri); // path where download file to be saved, with filename, here I have taken file name from supplied remote url
using (WebClient client = new WebClient())
{
try
{
if (!Directory.Exists("tepdownload"))
{
Directory.CreateDirectory("tepdownload");
}
Uri uri = new Uri(remoteUri);
//password username of your file server eg. ftp username and password
client.Credentials = new NetworkCredential("username", "password");
//delegate method, which will be called after file download has been complete.
client.DownloadFileCompleted += new AsyncCompletedEventHandler(Extract);
//delegate method for progress notification handler.
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgessChanged);
// uri is the remote url where filed needs to be downloaded, and FilePath is the location where file to be saved
client.DownloadFileAsync(uri, FilePath);
}
catch (Exception)
{
throw;
}
}
}
public void Extract(object sender, AsyncCompletedEventArgs e)
{
Console.WriteLine("File has been downloaded.");
}
public void ProgessChanged(object sender, DownloadProgressChangedEventArgs e)
{
Console.WriteLine($"Download status: {e.ProgressPercentage}%.");
}
}
以上代码文件将下载到项目目录下的tepdownload文件夹中。请阅读代码中的注释以了解以上代码的功能。
using (var client = new WebClient())
{
client.DownloadFile("http://example.com/file/song/a.mpeg", "a.mpeg");
}
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