C # 3 ways to intercept string string lengths

/// <summary>        ///intercepts a string of a specified length/// </summary>        /// <param name= "str" >the string to intercept</param>        /// <param name= "Len" >the length to intercept</param>        /// <param name= "Flag" >whether to add ellipses after interception (true Plus, false not added)</param>        /// <returns></returns>         Public Static stringCutstring (stringStrintLenBOOLflag) {            string_outstring =""; int_len =0;  for(inti =0; I < Str. Length; i++)            {                if(Char.converttoutf32 (str, i) >= Convert.ToInt32 ("4e00", -) && char.converttoutf32 (str, i) <= Convert.ToInt32 ("9fff", -) ) {_len+=2; if(_len > Len)//the length of the Intercept, if the last two bytes, does not intercept                    {                         Break; }                }                Else{_len++; }                Try{_outstring+ = str. Substring (I,1); }                Catch                {                     Break; }                if(_len >=Len) {                     Break; }            }            if(str! = _outstring && Flag = =true)//determine if ellipses are added{_outstring+="..."; }            return_outstring; }

/// <summary>        ///intercepts a string of a specified length/// </summary>        /// <param name= "str" >the string to intercept</param>        /// <param name= "Len" >the length to intercept</param>        /// <param name= "Flag" >whether to add ellipses after interception (true Plus, false not added)</param>        /// <returns></returns>         Public Static stringCutstring (stringStrintLenBOOLflag) {System.Text.ASCIIEncoding ASCII=NewSystem.Text.ASCIIEncoding (); byte[] BTS =ASCII.            GetBytes (str); int_len =0; string_outstring ="";  for(inti =0; I < BTS. Length; i++)            {                if((int) Bts[i] = = the)//two characters{len+=2; if(_len > Len)//the length of the Intercept, if the last two bytes, does not intercept                    {                         Break; }                }                Else{len+=1; }                Try{_outstring+ = str. Substring (I,1); }                Catch                {                     Break; }                if(_len >=Len) {                     Break; }            }            if(str! = _outstring && Flag = =true)//determine if ellipses are added{_outstring+="..."; }            return_outstring; }

/// <summary>        ///intercepts a string of a specified length/// </summary>        /// <param name= "str" >the string to intercept</param>        /// <param name= "Len" >the length to intercept</param>        /// <param name= "Flag" >whether to add ellipses after interception (true Plus, false not added)</param>        /// <returns></returns>         Public Static stringCutstring (stringStrintLenBOOLflag) {            if(str = =NULL|| Str. Length = =0|| Len <=0)            {                return string.            Empty; }            intL =Str.            Length; #regionCalculate lengthintClen =0;  while(Clen < len && Clen <l) {//for each encounter with a Chinese, reduce the target length by one.                 if((int) Str[clen] > -) {len--; } Clen++; }            #endregion            if(Clen <l) {returnFlag? Str. Substring (0, Clen) +"...": Str. Substring (0, Clen); }            Else            {                returnstr; }        }

C # 3 ways to intercept string string lengths