c# - 使用c#使下载可恢复

Question

我正在使用此方法(WebClient 类)从 Internet 下载文件:

private Task DownloadUpdate(string url, string fileName)
{
       var wc = new WebClient();
       return wc.DownloadFileTaskAsync(new Uri(url), @"c:\download" + fileName);
}

如何使用上述代码使下载可恢复？

Answer 1

来自 HttpWebRequest or WebRequest - Resume Download ASP.NET :

Resuming files is done by specifying the byte range of the file you would like to download using the Range HTTP header. This can be done in .NET with the HttpWebRequest.AddRange function.

例如:

request.AddRange(1000);