C # How to set a field number how to cover several special symbols in the middle

To achieve the mobile phone number, ID card number, mail, and other special signs such as the star cover function for privacy protection, the effect is as follows 136****0000 322300*******32432143

Ditto (24TT lottery software setup and operation):

1   /// <summary>2         ///generate a cover field by length such as * * *3         /// </summary>4         /// <param name= "Program_starlen" >length as 4</param>5         /// <param name= "Program_starchar" >cover symbols such as *</param>6         /// <returns></returns>7          Public Static stringStarcharshow (intProgram_starlen,stringProgram_starchar)8         {9             stringProgram_starcharshow ="";Ten              for(inti =0; i < Program_starlen; i++) One             { AProgram_starcharshow = Program_starcharshow +Program_starchar; -             } -             returnprogram_starcharshow; the         } -         /// <summary> -         ///Special Sign Cover -         /// </summary> +         /// <param name= "str" >pseudo-obscure word embox field</param> -         /// <param name= "Program_starbegin" >Start bit</param> +         /// <param name= "Program_starend" >End Bit</param> A         /// <param name= "Program_starcharshow" >Masking combination Symbols</param> at         /// <returns></returns> -          Public Static stringStrreplacebystar (stringStrintProgram_starbegin,intProgram_starend,stringProgram_starchar) -         { -             stringNewstr =""; -             stringA =""; -             stringb =""; in             intstarlen=program_starend-program_starbegin+1; -             if(Starlen <=0) to             { +                 returnstr; -             } the             stringprogram_starcharshow=starcharshow (Starlen, Program_starchar); *             if(str. Length <=program_starend) $             {Panax Notoginseng                 if(str. Length <program_starbegin) -                 { theA =str; +                 } A                 Else the                 { +A = str. Substring (0, Program_starbegin-1); -                 } $             } $             Else -             { -A = str. Substring (0, Program_starbegin-1); theb = str. Substring (Program_starend, str. Length-program_starend); -             }WuyiNewstr = a + Program_starcharshow +b; the             returnNewstr; -         } Wu         /// <summary> -         ///Special Sign Cover About         /// </summary> $         /// <param name= "str" >pseudo-obscure word embox field</param> -         /// <param name= "Program_starbegin" >Start bit</param> -         /// <param name= "Program_starend" >End Bit</param> -         /// <param name= "Program_starchar" >Mask Symbol Single</param> A         /// <returns></returns> +          Public Static stringStrreplacebystars (stringStrintProgram_starbegin,intProgram_starend,stringprogram_starcharshow) the         { -             stringNewstr =""; $             stringA =""; the             stringb =""; the             if(str. Length <=program_starend) the             { the                 if(str. Length <program_starbegin) -                 { inA =str; the                 } the                 Else About                 { theA = str. Substring (0, Program_starbegin-1); the                 } the             } +             Else -             { theA = str. Substring (0, Program_starbegin-1);Bayib = str. Substring (Program_starend, str. Length-program_starend); the             } theNewstr = a + Program_starcharshow +b; -             returnNewstr; -}

C # How to set a field number how to cover several special symbols in the middle