Question

这是我到目前为止所做的（这不起作用）。在这一点上，我认为我的目标是Ansi编码，但我真的不想在此时知道。我的浏览器似乎能够确定要使用的编码，我该怎么办？

static void GetUrl(Uri uri, string localFileName)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    HttpWebResponse response;

    response = (HttpWebResponse)request.GetResponse();

    // Save the stream to file
    Stream responseStream = response.GetResponseStream();
    StreamReader reader = new StreamReader(responseStream, Encoding.Default);
    Stream fileStream = File.OpenWrite(localFileName);
    using (StreamWriter sw = new StreamWriter(fileStream, Encoding.Default))
    {
        sw.Write(reader.ReadToEnd());
        sw.Flush();
        sw.Close();
     }
}

答案后（目前仅在UTF-8网站上测试）：

static void GetUrl(Uri uri, string localFileName)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    try
    {
        // Hope GetEncoding() knows how to parse the CharacterSet
        Encoding encoding = Encoding.GetEncoding(response.CharacterSet);
        StreamReader reader = new StreamReader(response.GetResponseStream(), encoding);
        using (StreamWriter sw = new StreamWriter(localFileName, false, encoding))
        {
            sw.Write(reader.ReadToEnd());
            sw.Flush();
            sw.Close();
        }
    }
    finally
    {
        response.Close();
    }
}

Answer 1

网络浏览器尝试检测字符编码的方式有三种。

查找（如果是HTML）：

<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">

或（对于XHTML）

<?xml version="1.0" encoding="ISO-8859-1"?>

或有时它甚至在http header

中指定

Content-Type: text/html; charset=ISO-8859-1

Answer 2

您应该查找服务器发送响应的编码。Encoding.Default此处不会切断芥末。： - ）

Stream responseStream = response.GetResponseStream();
Encoding enc = Encoding.GetEncoding(response.CharacterSet);
StreamReader reader = new StreamReader(responseStream, enc);
Stream fileStream = File.OpenWrite(localFileName);
using (StreamWriter sw = new StreamWriter(fileStream, enc))
{  /* ... */ }

可以肯定的是，您可以将所有内容转换为UTF-8并始终将文件存储为UTF-8。这样，在阅读文件时，您永远不需要猜测编码。

在C＃中，如何在不破坏编码的情况下将网页保存到文件中？

2 个答案: