datagridview - 如何在datagridview的同一个单元格中添加复选框和标签？

Question

嗨程序员，我需要在同一个单元格中添加复选框和标签。我知道该怎么做。我可以将datagridviewcolumn设置为复选框，但它只显示复选框，没有显示标签的地方。谁能把我从噩梦中唤醒？提前致谢。

Answer 1

我不相信开箱即用的 CheckBoxCell 不可能做到这一点。

这是一个实现复选框列的子类并进行一些自定义绘画以绘制标签。可以通过各种方式扩展它，例如为标签文本提供绑定（目前需要直接设置标签文本）。我的代码大量借鉴了这个论坛帖子。

using System;
using System.Windows.Forms;
using System.Drawing;

public class MyDGVCheckBoxColumn : DataGridViewCheckBoxColumn
{
    private string label;

    public string Label
    {
        get
        {
            return label;
        }
        set
        {
            label = value;
        }
    }

    public override DataGridViewCell CellTemplate
    {
        get
        {
            return new MyDGVCheckBoxCell();
        }
    }
}

public class MyDGVCheckBoxCell : DataGridViewCheckBoxCell
{
    private string label;

    public string Label
    {
        get
        {
            return label;
        }
        set
        {
            label = value;
        }

    }

    protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates elementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
    {

        // the base Paint implementation paints the check box
        base.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);

        // Get the check box bounds: they are the content bounds
        Rectangle contentBounds = this.GetContentBounds(rowIndex);

        // Compute the location where we want to paint the string.
        Point stringLocation = new Point();

        // Compute the Y.
        // NOTE: the current logic does not take into account padding.
        stringLocation.Y = cellBounds.Y + 2;


        // Compute the X.
        // Content bounds are computed relative to the cell bounds
        // - not relative to the DataGridView control.
        stringLocation.X = cellBounds.X + contentBounds.Right + 2;


        // Paint the string.
        if (this.Label == null)
        {
            MyDGVCheckBoxColumn col = (MyDGVCheckBoxColumn)this.OwningColumn;
            this.label = col.Label;
        }

        graphics.DrawString(
        this.Label, Control.DefaultFont, System.Drawing.Brushes.Red, stringLocation);

    }

}

这是显示用法的代码：

private void Form1_Load(object sender, EventArgs e)
{
    MyDGVCheckBoxColumn col = new MyDGVCheckBoxColumn();
    col.Label = "hippo";
    col.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft;
    this.dataGridView1.Columns.Add(col);
    this.dataGridView1.RowCount = 5;

    foreach (DataGridViewRow row in this.dataGridView1.Rows)
    {
        if (row.Index % 2 == 0)
        {
            ((MyDGVCheckBoxCell)row.Cells[0]).Label = "kitten";
        }
    }
}