The Server. UrlEncode function in ASP.net is different from the Server. URLEncode function in ASP !!!!

Call a download program today. When the downloaded URL contains Chinese characters, it cannot be downloaded, for example:

Http://www.huachu.com.cn/itbook/booklist.asp? Tsmc = assembly

I will use the Server. UrlEncode function in. net for conversion. However, this still does not work. The reason was not found after the experiment for a long time. Later I suspect that the Server. UrlEncode function in ASP.net is different from the value returned by the Server. URLEncode function in ASP. 1. Experiment. Actually, it is.

Test code:

What is the following code in ASP.net? Response. Write (Server. UrlEncode ("assembly "));? Return Value: % e6 % b1 % 87% e7 % bc % 96

The following code in ASP: Response. Write Server. URLEncode ("assembly ")?? Return Value: % BB % E3 % B1 % E0

Cause of this problem: Server. UrlEncode in ASP.net is handled by UTF-8 encoding by default. In ASP, the encoding method is set locally.

If you use the following encoding in ASP.net: ASP and ASP.net, the results will be the same:

Response. Write (HttpUtility. UrlEncode ("assembly", Encoding. Default ));

Use: Response. Write (HttpUtility. UrlEncode ("assembly", Encoding. UTF8 ));? Response. Write (Server. UrlEncode ("assembly "));?? Returned results.

 

 

 

 

HttpUtility. UrlEncode method:
Encode the URL string to implement reliable HTTP transmission from the Web server to the client.
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Converts byte arrays to encoded URL strings for reliable HTTP transmission from the Web server to the client.
[C #] public static string UrlEncode (byte []);
Encode the URL string to implement reliable HTTP transmission from the Web server to the client.
[C #] public static string UrlEncode (string );
The URL string is encoded using the specified encoding object to implement reliable HTTP transmission from the Web server to the client.
[C #] public static string UrlEncode (string, Encoding );
From the specified position in the array to the specified number of bytes, the byte array is converted into a URL-encoded string to implement reliable HTTP transmission from the Web server to the client.
[C #] public static string UrlEncode (byte [], int, int );
HttpUtility. UrlDecode method:
Converts a string that has been encoded for transmission in a URL into a decoded string.
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Converts a string that has been encoded for transmission in a URL into a decoded string.
[C #] public static string UrlDecode (string );
Use the specified decoded object to convert the URL-encoded byte array to a decoded string.
[C #] public static string UrlDecode (byte [], Encoding );
Use the specified encoding object to convert a URL-encoded string to a decoded string.
[C #] public static string UrlDecode (string, Encoding );
Use the specified encoding object to convert the URL encoded byte array to a decoded string starting from the specified position in the array to the specified number of bytes.
[C #] public static string UrlDecode (byte [], int, int, Encoding );

Server is an instance of the HttpServerUtility class and a property of System. Web. UI. Page.
HttpServerUtility. UrlEncode method:
Encode the string for reliable HTTP transmission from the Web server to the client through the URL.
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Encode the string and return the encoded string.
[C #] public string UrlEncode (string );
The URL encodes the string and sends the result output to the TextWriter output stream.
[C #] public void UrlEncode (string, TextWriter );
Example:
String TestString = "This is a <Test String> .";
StringWriter writer = new StringWriter ();
Server. UrlEncode (TestString, writer );
String EncodedString = writer. ToString ();
HttpServerUtility. UrlDecode method:
Decodes a string that is encoded for HTTP transmission and sent to the server in the URL.
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Perform URL Decoding on the string and return the decoded string.
[C #] public string UrlDecode (string );
Decodes the HTML string received in the URL and sends the result output to the TextWriter output stream.
[C #] public void UrlDecode (string, TextWriter );

Notes:
1. HttpUtility. UrlEncode and HttpUtility. UrlDecode are static methods, while Server. UrlEncode and Server. UrlDecode are instance methods.
2. Server is an instance of the HttpServerUtility class and a property of System. Web. UI. Page.
3. the string encoded with HttpUtility. UrlEncode is different from the string object encoded with Server. UrlEncode:
For example:
String url = "http://search.99read.com/index.aspx? Book_search = all & main_str = omyr ";
Response. Write (HttpUtility. UrlEncode (url ));
Response. Write ("<br> ");
Response. Write (Server. UrlEncode (url ));
The output result is:
Http % 3a % 2f % 2fsearch.99read.com % 2findex. aspx % 3fbook_search % 3 dall % 26main_str % 3d % e5 % a5 % a5 % e8 % bf % b7 % e5 % b0 % 94
Http % 3a % 2f % 2fsearch.99read.com % 2findex. aspx % 3fbook_search % 3 dall % 26main_str % 3d % b0 % c2 % c3 % d4 % b6 % fb

Cause: the Server. UrlEncode encoding method is based on the encoding method set by the local program, while HttpUtility. UrlEncode is encoded in. net UTF-8 format by default.
If you change the program:
String url1 = "http://search.99read.com/index.aspx? Book_search = all & main_str = omyr ";
Response. Write (HttpUtility. UrlEncode (url1, System. Text. Encoding. GetEncoding ("GB2312 ")));
Response. Write ("<br> ");
Response. Write (Server. UrlEncode (url1 ));
The output result is:
Http % 3a % 2f % 2fsearch.99read.com % 2findex. aspx % 3fbook_search % 3 dall % 26main_str % 3d % b0 % c2 % c3 % d4 % b6 % fb
Http % 3a % 2f % 2fsearch.99read.com % 2findex. aspx % 3fbook_search % 3 dall % 26main_str % 3d % b0 % c2 % c3 % d4 % b6 % fb
3. Sometimes the URLs transmitted by other systems are encoded in other encoding methods.
This section describes a self-written method to obtain the QueryString of the specified encoding format.
Public string GetNonNullQueryString (string key, Encoding encoding)
{
// Reference the System. Collections. Specialized and System. Text namespaces.
String stringValue;
System. Collections. Specialized. NameValueCollection encodingQueryString;
// This method is added in 2.0.
EncodingQueryString = HttpUtility. ParseQueryString (Request. Url. Query, encoding );
// The key in 'is the Key of the parameter you submitted
Return encodingQueryString [key]! = Null? EncodingQueryString [key]. Trim ():"";
}
Call:
String url = GetNonNullQueryString ("url", Encoding. UTF8). Trim ();