扩展 DataGridView 控件中单元格和列

扩展 DataGridView 控件中单元格和列

实现功能：在自定义列的单元格中，显示 图像+文字功能。即在一个cell中显示图像+文字

DataGridView实现了6种列和Cell。分别如下
==列=
System.Windows.Forms.DataGridViewButtonColumn
System.Windows.Forms.DataGridViewCheckBoxColumn
System.Windows.Forms.DataGridViewComboBoxColumn
System.Windows.Forms.DataGridViewImageColumn
System.Windows.Forms.DataGridViewLinkColumn
System.Windows.Forms.DataGridViewTextBoxColumn

Cell
System.Windows.Forms.DataGridViewButtonCell
System.Windows.Forms.DataGridViewCheckBoxCell
System.Windows.Forms.DataGridViewComboBoxCell
System.Windows.Forms.DataGridViewHeaderCell
System.Windows.Forms.DataGridViewImageCell
System.Windows.Forms.DataGridViewLinkCell
System.Windows.Forms.DataGridViewTextBoxCell

备注：
当从 DataGridViewCell 或 DataGridViewColumn 进行派生并将新属性添加到派生的类时，请确保重写 Clone 方法以在克隆操作过程中复制新属性。 还应调用基类的 Clone 方法，以便将基类的属性复制到新的单元格或列

单元格中要显示的数据类

 public class TextAndImgData
 {
     public string CellText { get; set; }

     public Image CellImage { get; set; }
 }

扩展DataGridViewTextBoxCell

public class MyTextAndImageCell : DataGridViewTextBoxCell
 {
     private Size imgSize;
     public MyTextAndImageCell() : base()
     {
         imgSize = new Size(21, 21);
     }

     private TextAndImgData _cellData;

     public TextAndImgData CellData
     {
         get { return _cellData; }
         set
         {
             _cellData = value;
             //Padding inheritedPadding = this.InheritedStyle.Padding;
             //让文字与cell左边相距 imgSize.Width + 10 个像素
             this.Style.Padding = new Padding(imgSize.Width + 10, 0, 0, 0);
         }
     }

     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
         if (value is TextAndImgData)
         {
             TextAndImgData cellData = value as TextAndImgData;
             this.CellData = cellData;
         }
         else
         {
             base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
             return;
         }

         if (this.CellData != null)
         {
             formattedValue = CellData.CellText;
             base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, CellData.CellText, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
             //绘制图片
             if (this.CellData.CellImage != null)
             {
                 // Draw the image clipped to the cell.
                 System.Drawing.Drawing2D.GraphicsContainer container = graphics.BeginContainer();
                 graphics.SetClip(cellBounds);

                 Rectangle destImgRec = new Rectangle();
                 destImgRec.X = cellBounds.Left + 5;
                 destImgRec.Y = cellBounds.Y + (cellBounds.Height - imgSize.Height) / 2;
                 destImgRec.Width = imgSize.Width;
                 destImgRec.Height = imgSize.Height;
                 graphics.DrawImage(this.CellData.CellImage, destImgRec);
                 //graphics.DrawImageUnscaled(this.CellData.CellImage, cellBounds.Location);
                 graphics.EndContainer(container);
             }
         }

     }

     public override object Clone()
     {
         MyTextAndImageCell c = base.Clone() as MyTextAndImageCell;
         c.CellData = this.CellData;
         return c;
     }
 }

扩展DataGridViewColumn

    public class MyTextAndImageColumn : DataGridViewColumn
    {
        public MyTextAndImageColumn()
        {
            //通过CellTemplate来设置该列要显示的单元格内容
            this.CellTemplate = new MyTextAndImageCell();
        }

        public override object Clone()
        {
            MyTextAndImageColumn c = base.Clone() as MyTextAndImageColumn;
            return c;
        }
    }

虚拟模式下使用方式

this.dataGridView1.VirtualMode = true;
this.dataGridView1.ColumnCount = 1;
this.this.dataGridView1.RowCount = FileDataSource.Files.Count;

//虚拟模式下处理CellValueNeeded事件来显示数据
this.dataGridView1.CellValueNeeded += DataGridView1_CellValueNeeded;

private void DataGridView1_CellValueNeeded(object? sender, DataGridViewCellValueEventArgs e)
{
    int colIndex = e.ColumnIndex;
    int rowIndex = e.RowIndex;
    if (rowIndex == -1) return;
    if (rowIndex < FileDataSource.QueryResultFiles.Count)
    {
        string colName = dataGridView1.Columns[e.ColumnIndex].DataPropertyName;
        switch (colIndex)
        {
            case 0:
                {
                    TextAndImgData imgData = new TextAndImgData();
                    imgData.CellText = EnrichFileModelMethod(FileDataSource.QueryResultFiles[e.RowIndex]).FileName;
                    imgData.CellImage = ImgHelper.GetIcon(EnrichFileModelMethod(FileDataSource.QueryResultFiles[e.RowIndex]).FilePath).ToBitmap();
                    e.Value = imgData;
                    break;
                }
        }

        //dataGridView1.Rows.Add();这一行不需要
    }


    // 从记录集中读取数据   

}

非虚拟模式-数据源绑定方式使用

public class MyFileInfo
{
    public TextAndImgData FileName { get; set; }
}
    

 this.dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
 this.dataGridView1.RowTemplate.Height = 55;
 //this.dataGridView1.ColumnHeadersHeight = 30;


 MyTextAndImageColumn column = new MyTextAndImageColumn();
 column.Name = "FileName";
 column.HeaderText = "Name";
 column.DataPropertyName = "FileName"; //设置数据源名称
 column.AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
 column.Width = 300;

// column.DefaultCellStyle.Padding = new System.Windows.Forms.Padding(32,0,0,0);

 this.dataGridView1.Columns.Add(column);

 this.dataGridView1.AutoGenerateColumns = false;

List<MyFileInfo> data = new List<MyFileInfo>();

 MyFileInfo f1 = new MyFileInfo();
 TextAndImgData cd1 = new TextAndImgData();
 cd1.CellText = @"E:\tools\MicrosoftVisualStudio10.0\Samples\2052";
 cd1.CellImage = ImgHelper.GetIcon(cd1.CellText).ToBitmap();
 f1.FileName = cd1;
 data.Add(f1);

 MyFileInfo f2 = new MyFileInfo();
 TextAndImgData cd2 = new TextAndImgData();
 cd2.CellText = @"E:\tools\MicrosoftVisualStudio10.0\Samples\2052\CSharpSamples.zip";
 cd2.CellImage = ImgHelper.GetIcon(cd2.CellText).ToBitmap();
 f2.FileName = cd2;
 data.Add(f2);
 this.dataGridView1.DataSource = data;