/// <summary> /// 可進行范圍檢查的 數值單元格 /// </summary> public class DecimalCheckCell : DataGridViewTextBoxCell { private bool checkMaxValue = false; private bool checkMinValue = false; private decimal maxValue = 0; private decimal minValue = 0; public decimal MaxValue {  get { return maxValue; }  internal set { maxValue = value; } } public decimal MinValue {  get { return minValue; }  internal set { minValue = value; } } public bool CheckMaxValue {  get { return checkMaxValue; }  internal set { checkMaxValue = value; } }  public bool CheckMinValue {  get { return checkMinValue; }  internal set  {  checkMinValue = value;  } } public override object Clone() {  DecimalCheckCell c = base.Clone() as DecimalCheckCell;  c.checkMaxValue = this.checkMaxValue;  c.checkMinValue = this.checkMinValue;  c.maxValue = this.maxValue;  c.minValue = this.minValue;  return c; } protected override void Paint(Graphics graphics, Rectangle clipBounds,  Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState,  object value, object formattedValue, string errorText,  DataGridViewCellStyle cellStyle,  DataGridViewAdvancedBorderStyle advancedBorderStyle,  DataGridViewPaintParts paintParts) {  // Paint the base content  base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState,  value, formattedValue, errorText, cellStyle,  advancedBorderStyle, paintParts);  // 上下界限溢出判斷  if (this.RowIndex < 0 || this.OwningRow.IsNewRow) // 行序號不為-1，且不是新記錄行（貌似沒用）  return;  if (value == null) return;  decimal vCurValue = Convert.ToDecimal(value);  bool overValue = false;  Image img = null;  if (checkMaxValue)  {  overValue = vCurValue > maxValue;  img = VsTest.Properties.Resources.Undo; // 圖片來自 添加的資源文件  }  if (checkMinValue && !overValue)  {  overValue = vCurValue < minValue;  img = VsTest.Properties.Resources.Redo; // 圖片來自 添加的資源文件  }  // 將圖片繪制在 數值文本后面  if (overValue && img != null)  {  var vSize = graphics.MeasureString(vCurValue.ToString(), cellStyle.Font);  System.Drawing.Drawing2D.GraphicsContainer container = graphics.BeginContainer();  graphics.SetClip(cellBounds);  graphics.DrawImageUnscaled(img, new Point(cellBounds.Location.X + (int)vSize.Width, cellBounds.Location.Y));  graphics.EndContainer(container);  } } protected override bool SetValue(int rowIndex, object value) {  if (rowIndex >= 0)  {  try  {   decimal vdeci = Convert.ToDecimal(value); // 篩選非數字   base.ErrorText = string.Empty;  }  catch (Exception ex)  {   base.ErrorText = "輸入錯誤" + ex.Message;   return false;  }  }  return base.SetValue(rowIndex, value); }  }

 /// <summary> /// 可進行范圍檢查的 數值列 /// </summary> public class DecimalCheckColumn : DataGridViewColumn {  private bool checkMaxValue = false;  private bool checkMinValue = false;  private decimal maxValue = 0;  private decimal minValue = 0;  public decimal MaxValue  {   get { return maxValue; }   set   {    maxValue = value;    (base.CellTemplate as DecimalCheckCell).MaxValue = value;   }  }  public decimal MinValue  {   get { return minValue; }   set   {    minValue = value;    (base.CellTemplate as DecimalCheckCell).MinValue = value;   }  }  /// <summary>  /// 是否對值上界限進行檢查，與MaxValue配合使用  /// </summary>  public bool CheckMaxValue  {   get { return checkMaxValue; }   set   {    checkMaxValue = value;    (base.CellTemplate as DecimalCheckCell).CheckMaxValue = value;   }  }  /// <summary>  /// 是否對值下界限進行檢查，與MinValue配合使用  /// </summary>  public bool CheckMinValue  {   get { return checkMinValue; }   set   {    checkMinValue = value;    (base.CellTemplate as DecimalCheckCell).CheckMinValue = value;   }  }  public DecimalCheckColumn()   : base(new DecimalCheckCell())  {     }  public override object Clone()  {   DecimalCheckColumn c = base.Clone() as DecimalCheckColumn;   c.checkMaxValue = this.checkMaxValue;   c.checkMinValue = this.checkMinValue;   c.maxValue = this.maxValue;   c.minValue = this.minValue;   return c;  } }

 private void TestForm_Load(object sender, EventArgs e)  {   InitControlsProperties(); // 初始化   // 綁定數據   DataTable dTabel = new DataTable();   dTabel.Columns.Add("ID",typeof(int));   dTabel.Columns.Add("TestValue",typeof(decimal));   Random rnd = new Random();   for (int i = 0; i < 10; i++) // 隨機10個數   {    var vdr = dTabel.NewRow();    vdr[0] = i + 1;    vdr[1] = rnd.Next(50);    dTabel.Rows.Add(vdr);   }   this.dataGridView1.DataSource = dTabel;  }  private void InitControlsProperties()  {   DecimalCheckColumn ColumnRoleID = new DecimalCheckColumn();   ColumnRoleID.DataPropertyName = "ID";   ColumnRoleID.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft;   ColumnRoleID.Name = "ID";   ColumnRoleID.HeaderText = "序號";   ColumnRoleID.Width = 50;   this.dataGridView1.Columns.Add(ColumnRoleID);   DecimalCheckColumn ColumnRoleName = new DecimalCheckColumn();   ColumnRoleName.DataPropertyName = "TestValue";   ColumnRoleName.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft;   ColumnRoleName.Name = "TestValue";   ColumnRoleName.HeaderText = "測試數據";   ColumnRoleName.Width = 100;   ColumnRoleName.CheckMaxValue = true; // 進行最大值檢查   ColumnRoleName.MaxValue = 41;   ColumnRoleName.CheckMinValue = true; // 進行最小值檢查   ColumnRoleName.MinValue = 7;   this.dataGridView1.Columns.Add(ColumnRoleName);   //this.dataGridView1.AllowUserToAddRows = false;   //this.dataGridView1.AllowUserToDeleteRows = false;   //this.dataGridView1.ReadOnly = true;   this.dataGridView1.AutoGenerateColumns = false;  }