为什么我的DataGridView中的按钮没有点击？

Question

当我将一行按钮移动到允许用户删除行时，向DataGridView添加一个按钮。我之前把它作为一个额外的列，但现在我只想让按钮在悬停时显示出来。该按钮将自身移动到悬停的行，并放置在最后一列的末尾。

为什么按钮不能让我点击它（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; 
    } 
} 

我试过在其他点击事件中添加它们，看它们如何与它们进行交互，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的创作：

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

尽量不要设置Button的Visible财产在CellMouseLeave事件处理程序。

由于您使用的是单Button整个DataGridView控制和简单地改变它的位置创建一个，你不需要处理CellMouseLeave事件。这适用于我：

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); 
     } 
    } 
}