C # Replaces all Chinese, punctuation, full-width turning half-width

  　　　　 Private voidbtnStart_Click (Objectsender, EventArgs e) {            varSrcwords =Todbc (TxtSrc.Text.Trim ()); varPlacestr = Regex.Replace (Srcwords,@"([\p{p}*])"," "); Placestr= Regex.Replace (Placestr,@"([\u4e00-\u9fa5])",""); varSplitwords = Placestr.split (New string[] {" "}, Stringsplitoptions.removeemptyentries); varWords = Splitwords.tolist (). Select (item =            {                if(item. Length >0)                {                    varFirst = Item. Substring (0,1).                    ToUpper (); varLast =""; if(item. Length >2) { last= Item. Substring (1, item. length-1); }                    returnFirst +Last ; }                return "";            }); varJoinwords =string. Join (" ", words);            Clipboard.settext (joinwords); Txtdes.text=appendwords (joinwords); MessageBox.Show ("copied the replaced string to the Pasteboard"); }        /// <summary>        ///Replace all Chinese and punctuation marks./// </summary>        /// <param name= "str" ></param>        /// <returns></returns>        stringRemoveallchineseandsymbol (stringstr) {            varPLACESTR = Regex.Replace (str,@"([\p{p}*])"," "); Placestr= Regex.Replace (Placestr,@"([\u4e00-\u9fa5])",""); returnPlacestr; }        /// <summary>        ///Append and replace content/// </summary>        /// <param name= "str" ></param>        /// <returns></returns>        stringAppendwords (stringstr) {            varAppend = Regex.Replace (Todbc (TxtAppend.Text.Trim ()),@"[\p{p}*]"," "); if(string. IsNullOrEmpty (Append)) {returnstr; }            varI=Combselect.selectedindex; if(i==0)            {                returnStr. Trim () +" "+append; }Else if(i==1)            {                returnAppend +" "+Str.            Trim (); }Else if(i==2)            {                varReplaceto=regex.replace (Todbc (TxtToReplace.Text.Trim ()),@"[\p{p}*]"," "); returnStr. Trim ().            Replace (Append, Replaceto); }            Else            {                returnstr; }        }        /// <summary>        ///full angle turning half angle/// </summary>        /// <param name= "input" ></param>        /// <returns></returns>         Public stringTODBC (stringinput) {            Char[] C =input.            ToCharArray ();  for(inti =0; i < c.length; i++)            {                if(C[i] = =12288) {C[i]= (Char) +; Continue; }                if(C[i] >65280&& C[i] <65375) C[i]= (Char) (C[i]-65248); }            return NewString (c); }        Private voidCombselect_selectedindexchanged (Objectsender, EventArgs e) {            varcb=(ComboBox) sender; Txttoreplace.visible= cb. selectedindex==2; }

C # Replaces all Chinese, punctuation, full-width turning half-width