如何从URL中获取数据并将其保存到C#.NET中的二进制文件中,而不会出现编码问题？

Question

在C#.NET中,我想从URL获取数据并将其保存为二进制文件.

使用的HttpWebRequest/StreamReader的读入一个字符串,并使用StreamWriter的节能工作正常ASCII,但非ASCII字符得到错位,因为系统认为它有担心编码,编码为Unicode或或什么的.

从URL获取数据并将其保存到文件二进制文件的最简单方法是什么？

// This code works, but for ASCII only
String url = "url...";
HttpWebRequest  request  = (HttpWebRequest)
WebRequest.Create(url);

// execute the request
HttpWebResponse response = (HttpWebResponse)
request.GetResponse();

// we will read data via the response stream
Stream ReceiveStream = response.GetResponseStream();
StreamReader readStream = new StreamReader( ReceiveStream );
string contents = readStream.ReadToEnd();

string filename = @"...";

// create a writer and open the file
TextWriter tw = new StreamWriter(filename);
tw.Write(contents.Substring(5));
tw.Close();

Answer 1

极简主义回答:

using (WebClient client = new WebClient()) {
    client.DownloadFile(url, filePath);
}

或者在PowerShell中(在匿名编辑中建议):

[System.Net.WebClient]::WebClient
$client = New-Object System.Net.WebClient
$client.DownloadFile($URL, $Filename)

Answer 2

只是不要使用任何StreamReader或TextWriter.使用原始FileStream保存到文件中.

String url = ...;
HttpWebRequest  request  = (HttpWebRequest) WebRequest.Create(url);

// execute the request
HttpWebResponse response = (HttpWebResponse) request.GetResponse();

// we will read data via the response stream
Stream ReceiveStream = response.GetResponseStream();

string filename = ...;

byte[] buffer = new byte[1024];
FileStream outFile = new FileStream(filename, FileMode.Create);

int bytesRead;
while((bytesRead = ReceiveStream.Read(buffer, 0, buffer.Length)) != 0)
    outFile.Write(buffer, 0, bytesRead);

// Or using statement instead
outFile.Close()