自定义针对Product Key处理的TextBox

代码：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Windows.Controls;
 using System.Windows.Input;

 namespace DriverEasyWPF.Utils
 {
     public class LicenseTextBox : TextBox
     {
         private bool isDelete = false;
         public int BasicLength { get; set; }//每段长度
         public int SumCount { get; set; }//总共几段
         public String SpChar { get; set; }//分隔的符号
         public bool ShowSpCharFirst { get; set; }
         protected override void OnTextChanged(TextChangedEventArgs e)
         {
             base.OnTextChanged(e);

             if (ShowSpCharFirst)
                 Do();
             else
                 Do2();

         }

         private void Do()
         {
             //SetCaretIndex();
             CheckWhetherDelete();

             InitData();
             /*
              *   eg:   12345-12345-12345-12345-12345
              */
             if (!isDelete)
             {
                 for (int i = ; i < SumCount - ; i++)
                 {
                     int length = BasicLength * (i + );
                     AppendSubtractByLength(length + i);
                     IgnoreInputSubtract(length + (i + ), SpChar);
                 }
                 int maxLength = BasicLength * SumCount + (SumCount - );
                 if (Text.Length >= maxLength || (Text.Length >= SumCount*BasicLength && Text.IndexOf(SpChar)<=))
                 {
                     //Text = Text.Substring(0, maxLength);//旧代码
                     //Regex reg = new Regex("[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}");
                     //原型是:^([A-Z0-9]{{0}}-){4}[A-Z0-9]{{5}}$
                     String regPattern = "^([A-Z0-9]{"+BasicLength+"}-){"+(SumCount-)+"}[A-Z0-9]{"+BasicLength+"}$";
                     Regex reg = new Regex(regPattern);
                     if (!reg.IsMatch(Text))
                     {
                         String content = Text.Replace(SpChar, String.Empty);
                         Text = content.Substring(, BasicLength) + SpChar
                             + content.Substring(BasicLength, BasicLength) + SpChar
                             + content.Substring(BasicLength * , BasicLength) + SpChar
                             + content.Substring(BasicLength * , BasicLength) + SpChar
                             + content.Substring(BasicLength * , BasicLength);
                     }
                     SetCaretIndex();
                 }
             }
         }

         private void Do2()
         {
             //SetCaretIndex();
             CheckWhetherDelete();

             InitData();
             /*
              *   eg:   12345-12345-12345-12345-12345
              */
             if (!isDelete)
             {
                 for (int i = ; i < SumCount - ; i++)
                 {
                     int length = BasicLength * (i + );
                     EqualsWithoutSpChar(length + i);
                     EqualsWithSpChar(length + i);
                 }

                 #region old logic
                 /*
                 if (Text.Length == 6 && Text[5].ToString().Equals(SpChar))
                     Text = Text;
                 if (Text.Length == 6 && !Text[5].ToString().Equals(SpChar))
                 {
                     Text = Text.Substring(0, 5) + SpChar + Text.Substring(5);
                     SetCaretIndex();
                 }

                 if (Text.Length == 12 && Text[11].ToString().Equals(SpChar))
                     Text = Text;
                 if (Text.Length == 12 && !Text[11].ToString().Equals(SpChar))
                 {
                     Text = Text.Substring(0, 11) + SpChar + Text.Substring(11);
                     SetCaretIndex();
                 }

                 if (Text.Length == 18 && Text[17].ToString().Equals(SpChar))
                     Text = Text;
                 if (Text.Length == 18 && !Text[17].ToString().Equals(SpChar))
                 {
                     Text = Text.Substring(0, 17) + SpChar + Text.Substring(17);
                     SetCaretIndex();
                 }

                 if (Text.Length == 24 && Text[23].ToString().Equals(SpChar))
                     Text = Text;
                 if (Text.Length == 24 && !Text[23].ToString().Equals(SpChar))
                 {
                     Text = Text.Substring(0, 23) + SpChar + Text.Substring(23);
                     SetCaretIndex();
                 }
 */
                 #endregion

                 int maxLength = BasicLength * SumCount + (SumCount - );
                 if (Text.Length > maxLength)
                 {
                     Text = Text.Substring(, maxLength);
                     SetCaretIndex();
                 }
             }
         }

         private void EqualsWithSpChar(int length)
         {
             if (Text.Length == (length+) && !Text[length].ToString().Equals(SpChar))
             {
                 Text = Text.Substring(, length) + SpChar + Text.Substring(length);
                 SetCaretIndex();
             }
         }

         private void EqualsWithoutSpChar(int length)
         {
             if (Text.Length == (length+) && Text[length].ToString().Equals(SpChar))
                 Text = Text;
         }

         /// <summary>
         /// 默认是 5段，每段5个长度
         /// </summary>
         private void InitData()
         {
             if (BasicLength <= )
                 BasicLength = ;

             if (SumCount <= )
                 SumCount = ;

             if (String.IsNullOrEmpty(SpChar))
                 SpChar = "-";

         }

         private void CheckWhetherDelete()
         {
             if (Keyboard.IsKeyDown(Key.Delete) || Keyboard.IsKeyDown(Key.Back))
                 isDelete = true;
             else
                 isDelete = false;
         }

         private void SetCaretIndex()
         {
             //this.CaretIndex = Text.Length;
             this.Focus();
             this.SelectionStart = Text.Length;
         }

         private void IgnoreInputSubtract(int length, String subChar)
         {
             if (Text.Length == length && Text[length - ].ToString() == subChar)
             {
                 Text = Text.Substring(, length - );
                 SetCaretIndex();
             }
         }

         private void AppendSubtractByLength(int length)
         {
             if (Text.Length == length)
             {
                 Text += SpChar;
                 SetCaretIndex();
             }
         }

     }
 }

使用：

  <!--现在xaml的文件头，添加相应的命名空间-->
  xmlns:model="clr-namespace:LicenseKeyTextBoxDemo.Model"

  <!--用法如下-->
  <model:LicenseTextBox Margin="88,220,70,255" BasicLength="5" SumCount="5" SpChar="-" IsMSMode="true"/>

想法：

改进：