Asp.net string truncation method

Public partial class substring: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
This. lblsub. Text = getfirststring ("Chinese", 7 );
This. lblsub2.text = getfirststring ("afafaf hello", 7 );
}

Public String getstr (string strinput, int intlen)
{
Strinput = strinput. Trim ();
Byte [] mybyte = system. Text. encoding. Default. getbytes (strinput );
Response. Write ("getstr function is:" + mybyte. length. tostring ());
If (mybyte. length> intlen)
{
// Screenshot operation
String resultstr = "";
For (INT I = 0; I <strinput. length; I ++)
{
Byte [] tempbyte = system. Text. encoding. Default. getbytes (resultstr );
If (tempbyte. Length <intlen)
{
Resultstr + = strinput. substring (I, 1 );
}
Else
{
Break;
}
}
Return resultstr + "...";
}
Else
{
Return strinput;
}
}

Public String cutstring (string strinput, int intlen)
{
Strinput = strinput. Trim ();
Byte [] mybyte = system. Text. encoding. Default. getbytes (strinput );
Response. Write ("cutstring function is:" + mybyte. length. tostring ());
If (mybyte. length> intlen)
{
// Screenshot operation
String resultstr = "";
For (INT I = 0; I <strinput. length; I ++)
{
Byte [] tempbyte = system. Text. encoding. Default. getbytes (resultstr );
If (tempbyte. Length <intlen)
{

Resultstr + = strinput. substring (I, 1 );
}
Else
{
Break;
}
}
Return resultstr + "...";
}
Else
{
Return strinput;
}
}

Public static string fix (string S, int Len)
{
String result = ""; // The final returned result.
Int bytelen = system. Text. encoding. Default. getbytecount (s); // the length of a single byte
Int charlen = S. length; // String Length when the characters are treated equally
Int bytecount = 0; // record the read progress {Chinese is calculated in two units}
Int Pos = 0; // record truncation position {Chinese is calculated in two units}
If (bytelen> Len)
{
For (INT I = 0; I <charlen; I ++)
{
If (convert. toint32 (S. tochararray () [I])> 255) // In case of Chinese Character Count plus 2
Bytecount + = 2;
Else // Add 1 to the English character
Bytecount + = 1;
If (bytecount> = Len) // when the specified length is reached, record the pointer position and stop
{
Pos = I;
Break;
}
}
Result = S. substring (0, POS) + "...";
}
Else
Result = s;

Return result;
}

# Region functions for truncating strings. partitions are in Chinese and English.
/// <Summary>
/// Functions for truncating strings
/// </Summary>
/// <Param name = "mtext"> string to be processed </param>
/// <Param name = "bytecount"> length </param>
/// <Returns> processed strings </returns>
Public String left (string mtext, int bytecount)
{
If (bytecount <1) return mtext;

If (system. Text. encoding. Default. getbytecount (mtext) <= bytecount)
{
Return mtext;
}
Else
{
Byte [] txtbytes = system. Text. encoding. Default. getbytes (mtext );
Byte [] newbytes = new byte [bytecount-4];

For (INT I = 0; I <bytecount-4; I ++)
{
Newbytes [I] = txtbytes [I];
}

Return System. Text. encoding. Default. getstring (newbytes) + "...";
}
}
# Endregion

Public static string getfirststring (string stringtosub, int length)
{
RegEx = new RegEx ("[\ u4e00-\ u9fa5] +", regexoptions. Compiled );
Char [] stringchar = stringtosub. tochararray ();
Stringbuilder sb = new stringbuilder ();
Int nlength = 0;
Bool iscut = false;
For (INT I = 0; I <stringchar. length; I ++)
{
If (RegEx. ismatch (stringchar [I]). tostring ()))
{
SB. append (stringchar [I]);
Nlength + = 2;
}
Else
{
SB. append (stringchar [I]);
Nlength = nlength + 1;
}

If (nlength> length)
{
Iscut = true;
Break;
}
}
If (iscut)
Return sb. tostring () + "...";
Else
Return sb. tostring ();
}
}

 

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