這篇文章主要介紹DataGridView如何實現(xiàn)帶圖標(biāo)的單元格，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
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目的：
擴展 C# WinForm 自帶的表格控件，使其可以自動判斷數(shù)據(jù)的上下界限值，并標(biāo)識溢出。
這里使用的方法是：擴展 表格的列 對象：DataGridViewColumn。
1.創(chuàng)建類：DecimalCheckCell
////// 可進行范圍檢查的 數(shù)值單元格 /// 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(shù)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(shù)字 base.ErrorText = string.Empty; } catch (Exception ex) { base.ErrorText = "輸入錯誤" + ex.Message; return false; } } return base.SetValue(rowIndex, value); } }
2.創(chuàng)建類：DecimalCheckColumn
////// 可進行范圍檢查的 數(shù)值列 /// 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; } } ////// 是否對值上界限進行檢查，與MaxValue配合使用 /// public bool CheckMaxValue { get { return checkMaxValue; } set { checkMaxValue = value; (base.CellTemplate as DecimalCheckCell).CheckMaxValue = value; } } ////// 是否對值下界限進行檢查，與MinValue配合使用 /// 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; } }
3.現(xiàn)在就可以使用了，在窗體上拖一個 dataGridView 控件，添加如下代碼：
重慶分公司
重慶分公司
private void TestForm_Load(object sender, EventArgs e)
{
InitControlsProperties(); // 初始化
// 綁定數(shù)據(jù)
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(shù)
{
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(shù)據(jù)";
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;
}運行效果如下圖左所示
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