要求：文本框中能手动输入数字，向上箭头根据鼠标位置给年月日递增，向下箭头递减

一：页面加载时：

  1. private void FlatDatePicker_Load(object sender, EventArgs e)
  2. {
  3.     txtMain.Text = DateTime.Now.ToString("MM/dd/yyyy");
  4.     txtMain.Location = new Point(,);
  5.     txtMain.Width = ;
  6.     btnUp.Width = ;
  7.     btnUp.Height = txtMain.Height / ;
  8.     btnDown.Width = ;
  9.     btnDown.Height = txtMain.Height / ;
  10.     this.Width = txtMain.Width + ;
  11.     this.Height = txtMain.Height;
  12.     btnUp.Location = new Point(txtMain.Width, );
  13.     btnDown.Location = new Point(txtMain.Width, btnUp.Height);
  14. }

二、按下Delete键时不允许删除"/"

  1. private void txtMain_KeyDown(object sender, KeyEventArgs e)
  2. {
  3.     switch (e.KeyCode)
  4.     {
  5.         //不允许Delete键删除'/'
  6.         case Keys.Delete:
  7.             int selectIndex = txtMain.SelectionStart;
  8.             int selectLength = txtMain.SelectionLength;
  9.             int xiegangIndex1 = txtMain.Text.IndexOf('/');
  10.             int xiegangIndex2 = txtMain.Text.LastIndexOf('/');
  11.             bool condition1 = selectLength == 0 && (selectIndex == xiegangIndex1 || selectIndex == xiegangIndex2);
  12.             bool condition2 = selectLength > 0 && txtMain.Text.Substring(selectIndex, selectLength).Contains("/");
  13.             if (condition1 || condition2)
  14.             {
  15.                 e.Handled = true;
  16.             }
  17.             break;
  18.         default:
  19.             break;
  20.     }
  21. }

三、按下键时排除不合适字符

  1. private void txtMain_KeyPress(object sender, KeyPressEventArgs e)
  2. {
  3.     #region 不合适字符
  4.     if (!Char.IsNumber(e.KeyChar) && !Char.IsPunctuation(e.KeyChar) && !Char.IsControl(e.KeyChar))
  5.     {
  6.         e.Handled = true;//消除不合适字符
  7.     }
  8.     else if (Char.IsPunctuation(e.KeyChar))
  9.     {
  10.         if (e.KeyChar != '.' || this.Text.Length == )//小数点
  11.         {
  12.             e.Handled = true;
  13.         }
  14.         if (this.Text.LastIndexOf('.') != -)
  15.         {
  16.             e.Handled = true;
  17.         }
  18.     }
  19.     else if (txtMain.Text == "")
  20.     {
  21.         e.Handled = true;
  22.     }
  23.     #endregion
  24.     #region 按下数字键 数字超过指定的年月日则无效
  25.     if (Char.IsNumber(e.KeyChar))//按下数字键
  26.     {
  27.         int selectedIndex = txtMain.SelectionStart;
  28.         int selectedLength = txtMain.SelectionLength;
  29.         int monthLength = txtMain.Text.Split('/')[].Length;
  30.         int dayLength = txtMain.Text.Split('/')[].Length;
  31.         int yearLength = txtMain.Text.Split('/')[].Length;
  32.         int monthIndex = txtMain.Text.IndexOf('/', , );
  33.         int dayIndex = txtMain.Text.IndexOf('/', );
  34.  
  35.         int month = DateTime.Now.Month;
  36.         int day = DateTime.Now.Day;
  37.         int year = DateTime.Now.Year;
  38.         if (txtMain.SelectedText.Contains("/"))
  39.         {
  40.             e.Handled = true;
  41.         }
  42.         else if (selectedIndex <= monthIndex)
  43.         {//修改月份
  44.             #region 修改月份
  45.             if (selectedIndex == )
  46.             {
  47.                 if (selectedLength == )
  48.                 {
  49.                     if (monthLength == )
  50.                     {
  51.                         int.TryParse(e.KeyChar.ToString() + txtMain.Text.Substring(, ), out month);
  52.                     }
  53.                     else if (monthLength == )
  54.                     {
  55.                         e.Handled = true;
  56.                     }
  57.                 }
  58.                 else if (selectedLength == )
  59.                 {
  60.                     if (monthLength == )
  61.                     {
  62.                         int.TryParse(e.KeyChar.ToString(), out month);
  63.                     }
  64.                     else if (monthLength == )
  65.                     {
  66.                         int.TryParse(e.KeyChar.ToString() + txtMain.Text.Substring(, ), out month);
  67.                     }
  68.                 }
  69.                 else if (selectedLength == )
  70.                 {
  71.                     int.TryParse(e.KeyChar.ToString(), out month);
  72.                 }
  73.             }
  74.             else if (selectedIndex == )
  75.             {
  76.                 if (selectedLength == )
  77.                 {
  78.                     if (monthLength == )
  79.                     {
  80.                         int.TryParse(txtMain.Text.Substring(, ) + e.KeyChar.ToString(), out month);
  81.                     }
  82.                     else if (monthLength == )
  83.                     {
  84.                         e.Handled = true;
  85.                     }
  86.                 }
  87.                 else if (selectedLength == )
  88.                 {
  89.                     int.TryParse(txtMain.Text.Substring(, ) + e.KeyChar.ToString(), out month);
  90.                 }
  91.             }
  92.             else if (selectedIndex == )
  93.             {
  94.                 e.Handled = true;
  95.             }
  96.  
  97.             if (month <=  || month >= )
  98.             {
  99.                 e.Handled = true;
  100.             }
  101.             #endregion
  102.         }
  103.         else if (selectedIndex <= dayIndex)
  104.         {//修改日期
  105.             #region 修改日期
  106.             if (selectedIndex == )
  107.             {
  108.                 if (selectedLength == )
  109.                 {
  110.                     if (dayLength == )
  111.                     {
  112.                         int.TryParse(e.KeyChar.ToString() + txtMain.Text.Substring(, ), out day);
  113.                     }
  114.                     else if (dayLength == )
  115.                     {
  116.                         e.Handled = true;
  117.                     }
  118.                 }
  119.                 else if (selectedLength == )
  120.                 {
  121.                     if (dayLength == )
  122.                     {
  123.                         int.TryParse(e.KeyChar.ToString(), out day);
  124.                     }
  125.                     else if (dayLength == )
  126.                     {
  127.                         int.TryParse(e.KeyChar.ToString() + txtMain.Text.Substring(, ), out day);
  128.                     }
  129.                 }
  130.                 else if (selectedLength == )
  131.                 {
  132.                     int.TryParse(e.KeyChar.ToString(), out day);
  133.                 }
  134.             }
  135.             else if (selectedIndex == )
  136.             {
  137.                 if (selectedLength == )
  138.                 {
  139.                     if (dayLength == )
  140.                     {
  141.                         int.TryParse(txtMain.Text.Substring(, ) + e.KeyChar.ToString(), out day);
  142.                     }
  143.                     else if (dayLength == )
  144.                     {
  145.                         e.Handled = true;
  146.                     }
  147.                 }
  148.                 else if (selectedLength == )
  149.                 {
  150.                     int.TryParse(txtMain.Text.Substring(, ) + e.KeyChar.ToString(), out day);
  151.                 }
  152.             }
  153.             else if (selectedIndex == )
  154.             {
  155.                 e.Handled = true;
  156.             }
  157.  
  158.             int.TryParse(txtMain.Text.Split('/')[], out month);
  159.             int.TryParse(txtMain.Text.Split('/')[], out year);
  160.             if ((month ==  || month ==  || month ==  || month ==  || month ==  || month ==  || month == ) && day > )
  161.             {
  162.                 e.Handled = true;
  163.             }
  164.             else if ((month ==  || month ==  || month ==  || month == ) && day > )
  165.             {
  166.                 e.Handled = true;
  167.             }
  168.             if (DateTime.IsLeapYear(year) && month ==  && day > )
  169.             {
  170.                 e.Handled = true;
  171.             }
  172.             else if (!DateTime.IsLeapYear(year) && month ==  && day > )
  173.             {
  174.                 e.Handled = true;
  175.             }
  176.             #endregion
  177.         }
  178.         else
  179.         {//修改年份
  180.             #region 修改年份
  181.             if (yearLength == )
  182.             {
  183.                 int.TryParse(txtMain.Text.Substring(, ) + e.KeyChar.ToString(), out year);
  184.                 if (year < )
  185.                 {
  186.                     e.Handled = true;
  187.                     //txtMain.Text = txtMain.Text.Split('/')[0] + "/" + txtMain.Text.Split('/')[1] + "/" + DateTime.Now.Year;
  188.                 }
  189.             }
  190.             else if (yearLength >  && selectedLength <= )
  191.             {
  192.                 e.Handled = true;
  193.             }
  194.             #endregion
  195.         }
  196.     }
  197.     #endregion
  198.     #region 按下BackSpcae键 不允许删除"/"
  199.     if (e.KeyChar == '\b')
  200.     {
  201.         int selectIndex = txtMain.SelectionStart;
  202.         int selectlength = txtMain.SelectionLength;
  203.         if (selectlength ==  && selectIndex > )
  204.         {
  205.             string delStr = txtMain.Text.Substring(selectIndex - , );
  206.             if (delStr == "/")
  207.             {
  208.                 e.Handled = true;
  209.             }
  210.         }
  211.         if (selectlength > )
  212.         {
  213.             string delStr = txtMain.Text.Substring(selectIndex, selectlength);
  214.             if (delStr.Contains("/"))
  215.             {
  216.                 e.Handled = true;
  217.             }
  218.         }
  219.     }
  220.     #endregion
  221. }

四、

  1. private void txtMain_KeyUp(object sender, KeyEventArgs e)
  2. {
  3.     int selectIndex = txtMain.SelectionStart;
  4.     int month = ;
  5.     int.TryParse(txtMain.Text.Split('/')[], out month);
  6.     int day = ;
  7.     int.TryParse(txtMain.Text.Split('/')[], out day);
  8.     int year = ;
  9.     int.TryParse(txtMain.Text.Split('/')[], out year);
  10.     int xiegangIndex1 = txtMain.Text.IndexOf('/');//第一个'/'的位置
  11.     int xiegangIndex2 = txtMain.Text.LastIndexOf('/');//第二个'/'的位置
  12.     switch (e.KeyCode)
  13.     {
  14.         #region 松开左右键
  15.         case Keys.Left:
  16.             if (selectIndex <= xiegangIndex1)
  17.             {
  18.                 FillDay();
  19.                 Fillyear();
  20.             }
  21.             else if (selectIndex <= xiegangIndex2)
  22.             {
  23.                 FillMonth();
  24.                 Fillyear();
  25.             }
  26.             else
  27.             {
  28.                 FillMonth();
  29.                 FillDay();
  30.             }
  31.             txtMain.SelectionStart = selectIndex;
  32.             break;
  33.         case Keys.Right:
  34.             if (selectIndex <= xiegangIndex1)
  35.             {
  36.                 FillDay();
  37.                 Fillyear();
  38.             }
  39.             else if (selectIndex <= xiegangIndex2)
  40.             {
  41.                 FillMonth();
  42.                 Fillyear();
  43.             }
  44.             else
  45.             {
  46.                 FillMonth();
  47.                 FillDay();
  48.             }
  49.             break;
  50.         #endregion
  51.         case Keys.End:
  52.             break;
  53.         case Keys.Home:
  54.             break;
  55.         #region 上下键增减年月日
  56.         case Keys.Up:
  57.             selectIndex++;
  58.             if (selectIndex < )
  59.             {
  60.                 if (month < )
  61.                 {
  62.                     month++;
  63.                     FillMonth(month);
  64.                 }
  65.                 txtMain.Select(, );
  66.             }
  67.             else if (selectIndex < )
  68.             {
  69.                 bool condition1 = (month ==  || month ==  || month ==  || month ==  || month ==  || month ==  || month == ) && day < ;
  70.                 bool condition2 = (month ==  || month ==  || month ==  || month == ) && day < ;
  71.                 bool condition3 = month ==  && (DateTime.IsLeapYear(year) && day <  || !DateTime.IsLeapYear(year) && day < );
  72.                 if (condition1 || condition2 || condition3)
  73.                 {
  74.                     day++;
  75.                     FillDay(day);
  76.                 }
  77.                 txtMain.Select(, );
  78.             }
  79.             else
  80.             {
  81.                 if (year < )
  82.                 {
  83.                     year++;
  84.                     Fillyear(year);
  85.                 }
  86.                 txtMain.Select(, );
  87.             }
  88.             break;
  89.         case Keys.Down:
  90.             selectIndex--;
  91.             if (selectIndex < )
  92.             {
  93.                 if (month > )
  94.                 {
  95.                     month--;
  96.                     FillMonth(month);
  97.                 }
  98.                 txtMain.SelectionStart = ;
  99.                 txtMain.Select(, );
  100.             }
  101.             else if (selectIndex < )
  102.             {
  103.                 if (day > )
  104.                 {
  105.                     day--;
  106.                     FillDay(day);
  107.                 }
  108.                 txtMain.SelectionStart = ;
  109.                 txtMain.Select(, );
  110.             }
  111.             else
  112.             {
  113.                 if (year > )
  114.                 {
  115.                     year--;
  116.                     Fillyear(year);
  117.                 }
  118.                 txtMain.SelectionStart = ;
  119.                 txtMain.Select(, );
  120.             }
  121.             break;
  122.         #endregion
  123.         case Keys.Delete:
  124.             break;
  125.         #region 松开数字键
  126.         case Keys.D0:
  127.         case Keys.D1:
  128.         case Keys.D2:
  129.         case Keys.D3:
  130.         case Keys.D4:
  131.         case Keys.D5:
  132.         case Keys.D6:
  133.         case Keys.D7:
  134.         case Keys.D8:
  135.         case Keys.D9:
  136.         case Keys.NumPad0:
  137.         case Keys.NumPad1:
  138.         case Keys.NumPad2:
  139.         case Keys.NumPad3:
  140.         case Keys.NumPad4:
  141.         case Keys.NumPad5:
  142.         case Keys.NumPad6:
  143.         case Keys.NumPad7:
  144.         case Keys.NumPad8:
  145.         case Keys.NumPad9:
  146.             if ((month >  || selectIndex > ) && txtMain.Text.Split('/')[].Length <  || (selectIndex ==  && txtMain.Text.Split('/')[].Length == ))
  147.             {
  148.                 EidtDay(month);
  149.                 FillMonth();
  150.                 txtMain.Select(, );
  151.             }
  152.  
  153.             if ((month ==  && day >  || month !=  && day >  || (selectIndex <  || selectIndex > )) && txtMain.Text.Split('/')[].Length <  || (selectIndex ==  && txtMain.Text.Split('/')[].Length == ))
  154.             {
  155.                 FillDay();
  156.                 txtMain.Select(, );
  157.             }
  158.  
  159.             if (selectIndex >  && txtMain.Text.Split('/')[].Length >= )
  160.             {
  161.                 EidtDay(month, year);
  162.                 Fillyear();
  163.             }
  164.             break;
  165.         #endregion
  166.         default:
  167.             break;
  168.     }
  169. }

五、

  1. private void txtMain_Leave(object sender, EventArgs e)
  2. {
  3.     FillMonth();
  4.     FillDay();
  5.     Fillyear();
  6. }

六、

  1. private void txtMain_MouseDown(object sender, MouseEventArgs e)
  2. {
  3.     FillMonth();
  4.     FillDay();
  5.     Fillyear();
  6. }

七、

  1. private void btnUp_Click(object sender, EventArgs e)
  2. {
  3.     int selectIndex = txtMain.SelectionStart;
  4.     int month = ;
  5.     int.TryParse(txtMain.Text.Split('/')[], out month);
  6.     int day = ;
  7.     int.TryParse(txtMain.Text.Split('/')[], out day);
  8.     int year = ;
  9.     int.TryParse(txtMain.Text.Split('/')[], out year);
  10.     if (selectIndex < )
  11.     {
  12.         if (month < )
  13.         {
  14.             month++;
  15.             FillMonth(month);
  16.         }
  17.         txtMain.Select();
  18.         txtMain.Select(, );
  19.     }
  20.     else if ( <= selectIndex && selectIndex < )
  21.     {
  22.         bool condition1 = (month ==  || month ==  || month ==  || month ==  || month ==  || month ==  || month == ) && day < ;
  23.         bool condition2 = (month ==  || month ==  || month ==  || month == ) && day < ;
  24.         bool condition3 = month ==  && (DateTime.IsLeapYear(year) && day <  || !DateTime.IsLeapYear(year) && day < );
  25.         if (condition1 || condition2 || condition3)
  26.         {
  27.             day++;
  28.             FillDay(day);
  29.         }
  30.         txtMain.Select();
  31.         txtMain.Select(, );
  32.     }
  33.     else if (selectIndex >= )
  34.     {
  35.         if (year < )
  36.         {
  37.             year++;
  38.             Fillyear(year);
  39.         }
  40.         txtMain.Select();
  41.         txtMain.Select(, );
  42.     }
  43. }
  44. private void btnDown_Click(object sender, EventArgs e)
  45. {
  46.     int selectIndex = txtMain.SelectionStart;
  47.     int month = ;
  48.     int.TryParse(txtMain.Text.Split('/')[], out month);
  49.     int day = ;
  50.     int.TryParse(txtMain.Text.Split('/')[], out day);
  51.     int year = ;
  52.     int.TryParse(txtMain.Text.Split('/')[], out year);
  53.     if (selectIndex < )
  54.     {
  55.         if (month > )
  56.         {
  57.             month--;
  58.             FillMonth(month);
  59.         }
  60.         txtMain.Select();
  61.         txtMain.Select(, );
  62.     }
  63.     else if ( <= selectIndex && selectIndex < )
  64.     {
  65.         if (day > )
  66.         {
  67.             day--;
  68.             FillDay(day);
  69.         }
  70.         txtMain.Select();
  71.         txtMain.Select(, );
  72.     }
  73.     else if (selectIndex >= )
  74.     {
  75.         if (year > )
  76.         {
  77.             year--;
  78.             Fillyear(year);
  79.         }
  80.         txtMain.Select();
  81.         txtMain.Select(, );
  82.     }
  83. }

八、

  1. private bool Fillyear(int year = )
  2. {
  3.     bool editBool = false;
  4.     if (year == )
  5.     {
  6.         int.TryParse(txtMain.Text.Split('/')[], out year);
  7.         if (year == )
  8.         {
  9.             year = DateTime.Now.Year;
  10.             editBool = true;
  11.         }
  12.     }
  13.     if (year <  && year > )
  14.     {
  15.         txtMain.Text = txtMain.Text.Split('/')[] + "/" + txtMain.Text.Split('/')[] + "/" + DateTime.Now.Year;
  16.         editBool = true;
  17.     }
  18.     else
  19.     {
  20.         txtMain.Text = txtMain.Text.Split('/')[] + "/" + txtMain.Text.Split('/')[] + "/" + year;
  21.         editBool = true;
  22.     }
  23.     return editBool;
  24.     //txtMain.Select(0, 2);
  25. }
  26.  
  27. private bool FillMonth(int month = )
  28. {
  29.     bool editBool = false;
  30.     if (month == )
  31.     {
  32.         int.TryParse(txtMain.Text.Split('/')[], out month);//txtMain.Text.Substring(0, 2)
  33.         if (month == )
  34.         {
  35.             month = DateTime.Now.Month;
  36.             editBool = true;
  37.         }
  38.     }
  39.     if ( >= month && month > )
  40.     {
  41.         txtMain.Text = "" + month.ToString() + "/" + txtMain.Text.Split('/')[] + "/" + txtMain.Text.Split('/')[];
  42.         editBool = true;
  43.     }
  44.     else
  45.     {
  46.         txtMain.Text = month + "/" + txtMain.Text.Split('/')[] + "/" + txtMain.Text.Split('/')[];
  47.         editBool = true;
  48.     }
  49.     return editBool;
  50.     //txtMain.Select(3, 2);
  51. }
  52.  
  53. private bool FillDay(int day = )
  54. {
  55.     bool editBool = false;
  56.     if (day == )
  57.     {
  58.         int.TryParse(txtMain.Text.Split('/')[], out day);//txtMain.Text.Substring(0, 2)
  59.         if (day == )
  60.         {
  61.             day = DateTime.Now.Day;
  62.             editBool = true;
  63.         }
  64.     }
  65.     if ( >= day && day > )
  66.     {
  67.         txtMain.Text = txtMain.Text.Split('/')[] + "/" + "" + day.ToString() + "/" + txtMain.Text.Split('/')[];
  68.         editBool = true;
  69.     }
  70.     else
  71.     {
  72.         txtMain.Text = txtMain.Text.Split('/')[] + "/" + day.ToString() + "/" + txtMain.Text.Split('/')[];
  73.         editBool = true;
  74.     }
  75.     return editBool;
  76.     //txtMain.Select(6, 4);
  77. }

九、

  1. /// <summary>
  2. /// 根据年月判断日期是否超出范围 是则修改
  3. /// </summary>
  4. private void EidtDay(int month = , int year = )
  5. {
  6.     if (month == )
  7.     {
  8.         int.TryParse(txtMain.Text.Split('/')[], out month);
  9.     }
  10.     int day = ;
  11.     int.TryParse(txtMain.Text.Split('/')[], out day);
  12.     if (year == )
  13.     {
  14.         int.TryParse(txtMain.Text.Split('/')[], out year);
  15.     }
  16.     if (month == )
  17.     {
  18.         month = DateTime.Now.Month;
  19.     }
  20.     if (day == )
  21.     {
  22.         day = DateTime.Now.Day;
  23.     }
  24.     if (year == )
  25.     {
  26.         year = DateTime.Now.Year;
  27.     }
  28.     if ((month ==  || month ==  || month ==  || month == ) && day > )
  29.     {
  30.         if (month < )
  31.         {
  32.             txtMain.Text = "" + month + "/30/" + year;
  33.         }
    　　　　 else
    　　　　 {
    　　　　 　　 txtMain.Text = month + "/30/" + year;
    　　　　 }
        }
  1. 　　 if (DateTime.IsLeapYear(year) && month ==  && day > )
  2.     {
  3.         txtMain.Text = "" + month + "/29/" + year;
  4.     }
  5.     if (!DateTime.IsLeapYear(year) && month ==  && day > )
  6.     {
  7.         txtMain.Text = "" + month + "/28/" + year;
  8.     }
  9. }

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