About asp.net HttpUtility.UrlDecode decoding problem

Author：Eve Cole Update Time：2013-03-21 16:24:56

I recently made a payment interface, and the other party used gb2312 encoding when calling back.

Asp.net default request parameters are UTF-8 encoding

In this way, when I get the value, setting Request.ContentEncoding = Encoding.GetEncoding("gb2312") in the page_load event or preint event is invalid.

Test case: Build an asp.net web application, drag a button and a textbox control

Page_Load event code:

 protected void Page_Load( object sender, EventArgs e)
{
     Response.ContentEncoding = Encoding.GetEncoding( " gb2312 " );
     // Request.ContentEncoding = Encoding.GetEncoding("gb2312"); // The setting is invalid
}

In this way, we use gb2312 for every response. According to the asp.net default requset object, the encoding is utf-8 when initialized. When we enter Chinese in the text box and click the button button, the request encoding is utf-8 and the response encoding is gb2312. , so the text box data becomes garbled when sent back (the Chinese part of the text box displays a string of question marks)

The method that is always given on the Internet is to modify the configuration file <globalization requestEncoding= "gb2312 " />. This is global and is not recommended. What we need is to modify the request response encoding of a certain page without affecting other pages.

Solution 1 is given now: just rewrite the InitializeCulture method and add the setting of Request.ContentEncoding

 protected override void InitializeCulture()
{
       base .InitializeCulture();
       Request.ContentEncoding = Encoding.GetEncoding( " gb2312 " );
}

Solution 2: Get the form data string and parse it yourself

Encoding encoding = Encoding.GetEncoding( " gb2312 " ); // Select the decoding method
Stream resStream = Request.InputStream; // The received forms are placed here
byte [] content = new byte [resStream.Length];
resStream.Read(content, 0 , content.Length);
string postQuery = encoding.GetString(content);
// NameValueCollection resDic = HttpUtility.ParseQueryString(postQuery, encoding); // Solve the encoding problem, it will still decode automatically by default

A simple analysis method is given below:

    /// <summary>
    /// Parse query string /// </summary>
    /// <param name="postQuery"></param>
    /// <returns></returns>
    private NameValueCollection GetFormParams( string postQuery)
    {
        NameValueCollection result = new NameValueCollection();
        string [] nameValueList = postQuery.Split( ' & ' );
        foreach ( string item in nameValueList)
        {
            if (item.Contains( ' = ' ))
            {
                string [] nameValue = item.Split( ' = ' );
                result.Add(nameValue[ 0 ], nameValue[ 1 ]);
            }
        }
        return result;
    }