为什么我的 DataGridView 中的这个按钮没有点击？

Question

我在 DataGridView 中添加了一个按钮，当鼠标悬停在一行上时，用户可以删除该行。我以前将此作为一个额外的列，但现在我只想在悬停时显示该按钮。该按钮将自身移动到悬停在最后一列末尾的行。

为什么按钮不允许我点击它（事件永远不会触发）？

public class CustomDataGridView : DataGridView
{
    private Button deleteButton = new Button();

    public CustomDataGridView()
    {
        this.Columns.Add("Column1", "Column1");
        this.Columns.Add("Column2", "Column2");
        this.Columns.Add("Column3", "Column3");

        this.CellMouseEnter += this_CellMouseEnter;
        this.CellMouseLeave += this_CellMouseLeave;

        deleteButton.Height = this.RowTemplate.Height - 1;
        deleteButton.Width = this.RowTemplate.Height - 1;
        deleteButton.Text = "";
        deleteButton.Visible = false;

        deleteButton.MouseClick += (s, e) =>
            MessageBox.Show("Delete Button Clicked!", "", MessageBoxButtons.OK);

        this.Controls.Add(deleteButton);
    }

    private void this_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
    {
        if (e.RowIndex != -1)
        {
            deleteButton.Visible = true;
            Rectangle rect = this.GetCellDisplayRectangle(2, e.RowIndex, true);
            deleteButton.Location = new Point(rect.Right - deleteButton.Width - 1, rect.Top);
        }
    }

    private void this_CellMouseLeave(object sender, DataGridViewCellEventArgs e) {
        if (e.RowIndex != -1)
            deleteButton.Visible = false;
    }
}

我尝试添加其他 Click 事件以查看它们如何与之交互，并且它们似乎工作正常。

this.Click += (s, e) =>
    MessageBox.Show("DataGridView Clicked!", "", MessageBoxButtons.OK);
this.CellClick += (s, e) => 
    MessageBox.Show("Cell Clicked!", "", MessageBoxButtons.OK);
this.MouseClick += (s, e) =>
    MessageBox.Show("DataGridView Mouse Clicked!", "", MessageBoxButtons.OK);
this.CellContentClick += (s, e) =>
    MessageBox.Show("Cell Content Clicked!", "", MessageBoxButtons.OK);

CustomDataGridView的创建：

public partial class MainForm : Form {      
    public MainForm() {
        InitializeComponent();

        CustomDataGridView dgv = new CustomDataGridView();
        dgv.Location = new Point(100, 100);
        dgv.Width = 500;
        dgv.Height = 300;
        this.Controls.Add(dgv);

        dgv.Rows.Add("text1", "", "");
        dgv.Rows.Add("text2", "", "");
        dgv.Rows.Add("text3", "", "");
        dgv.Rows.Add("text4", "", "");
        dgv.Rows.Add("text5", "", "");
    }
}

Answer 1

尽量不要在CellMouseLeave事件处理程序中设置Button的Visible属性。

由于您正在为整个DataGridView 控件创建一个使用单个Button 并简单地更改它的位置，因此您不需要处理CellMouseLeave 事件。这对我有用：

public class CustomDataGridView : DataGridView
{
    private Button deleteButton = new Button();

    public CustomDataGridView()
    {
        this.Columns.Add("Column1", "Column1");
        this.Columns.Add("Column2", "Column2");
        this.Columns.Add("Column3", "Column3");

        this.CellMouseEnter += this_CellMouseEnter;

        deleteButton.Height = this.RowTemplate.Height - 1;
        deleteButton.Width = this.RowTemplate.Height - 1;
        deleteButton.Text = "";
        deleteButton.Visible = false;

        deleteButton.MouseClick += (s, e) =>
            MessageBox.Show("Delete Button Clicked!", "", MessageBoxButtons.OK);

        this.Controls.Add(deleteButton);
    }

    private void this_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
    {
        if (e.RowIndex != -1)
        {
            deleteButton.Visible = true;
            Rectangle rect = this.GetCellDisplayRectangle(2, e.RowIndex, true);
            deleteButton.Location = new Point(rect.Right - deleteButton.Width - 1, rect.Top);
        }
    }
}