从URL路径下载文件的简单方法是什么?
当前回答
您可能需要在文件下载期间了解状态并更新ProgressBar,或者在发出请求之前使用凭据。
下面是一个包含这些选项的示例。Lambda符号和字符串插值已被使用:
using System.Net;
// ...
using (WebClient client = new WebClient()) {
Uri ur = new Uri("http://remotehost.do/images/img.jpg");
//client.Credentials = new NetworkCredential("username", "password");
String credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes("Username" + ":" + "MyNewPassword"));
client.Headers[HttpRequestHeader.Authorization] = $"Basic {credentials}";
client.DownloadProgressChanged += (o, e) =>
{
Console.WriteLine($"Download status: {e.ProgressPercentage}%.");
// updating the UI
Dispatcher.Invoke(() => {
progressBar.Value = e.ProgressPercentage;
});
};
client.DownloadDataCompleted += (o, e) =>
{
Console.WriteLine("Download finished!");
};
client.DownloadFileAsync(ur, @"C:\path\newImage.jpg");
}
其他回答
有很多答案,但这是我最近使用的。net 6或更高版本的解决方案。
using var httpClient = new HttpClient();
var tempPath = Path.GetTempFileName();
await using var s = await HttpClient.GetStreamAsync(pdfFilePath);
await using var fs = File.OpenWrite(tempPath);
await s.CopyToAsync(fs);
使用System.Net.WebClient.DownloadFile:
string remoteUri = "http://www.contoso.com/library/homepage/images/";
string fileName = "ms-banner.gif", myStringWebResource = null;
// Create a new WebClient instance.
using (WebClient myWebClient = new WebClient())
{
myStringWebResource = remoteUri + fileName;
// Download the Web resource and save it into the current filesystem folder.
myWebClient.DownloadFile(myStringWebResource, fileName);
}
这是我的解决方案,效果很好:
public static void DownloadFile(string url, string pathToSaveFile)
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
// or: ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
using (WebDownload client = new WebDownload())
{
client.Headers["User-Agent"] = "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36";
client.DownloadFile(new Uri(url), pathToSaveFile);
}
}
public class WebDownload : WebClient
{
protected override WebRequest GetWebRequest(Uri address)
{
HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);
if (request != null)
{
request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
}
return request;
}
}
static void Main(string[] args)
{
DownloadFileAsync().GetAwaiter();
Console.WriteLine("File was downloaded");
Console.Read();
}
private static async Task DownloadFileAsync()
{
WebClient client = new WebClient();
await client.DownloadFileTaskAsync(new Uri("http://somesite.com/myfile.txt"), "mytxtFile.txt");
}
using (var client = new WebClient())
{
client.DownloadFile("http://example.com/file/song/a.mpeg", "a.mpeg");
}
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