Datagridgridview拖放事件

Question

我想写一个拖放功能，我只是有点困难。

我的问题如下：

1）在reguards所附的代码，应该Load_Load事件被称为第一或不要紧，它是按什么顺序（你可以看到，它的最后一个事件称为在这组代码中）。

2.）拖/放事件工作，但是当我点击一个单元格或列标题，在网格二我得到：类型'System.ArgumentOutOfRangeException'的未处理的异常发生在mscorlib.dll中。我该如何解决这个问题？

3.）在数据网格2中，单元格0和单元格1编号为单元格0和单元格1.当我将鼠标悬停在两个单元格上时，单元格0的值为0-1，单元格1的值为1-2，其余单元格没有编号或有工具提示。这是如何修复的？

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 

namespace Suite_Estimation 
{ 
public partial class Form1 : Form 
{ 
    public Form1() 
    { 
     InitializeComponent(); 
    } 

    private void dataGridView1_DragDrop(object sender, DragEventArgs e) 
    { 
     if (e.Data.GetDataPresent(typeof(System.String))) 
     { 
      Point clientPoint = dataGridView1.PointToClient(new Point(e.X, e.Y));    
      dataGridView1.Rows[dataGridView1.HitTest(clientPoint.X,  clientPoint.Y).RowIndex].Cells[dataGridView1.HitTest(clientPoint.X, clientPoint.Y).ColumnIndex].Value = (System.String)e.Data.GetData(typeof(System.String)); 

     } 
} 

    private void dataGridView1_DragEnter(object sender, DragEventArgs e) 
    { 
    if (e.Data.GetDataPresent(typeof(System.String))) 
      e.Effect = DragDropEffects.Copy; 
     else 
      e.Effect = DragDropEffects.None; 
    } 

    private void dataGridView2_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e) 
    { 
    dataGridView2.DoDragDrop(dataGridView2.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString(), DragDropEffects.Copy); 

    } 

    private void Form1_Load(object sender, EventArgs e) 
    { 
     DataGridViewRow dr = new DataGridViewRow(); 

     dataGridView2.Rows.Add(5); 
     dataGridView2.Rows[0].Cells[0].Value = "00000000"; 
     dataGridView2.Rows[1].Cells[0].Value = "11111111"; 
     dataGridView2.Rows[2].Cells[0].Value = "22222222"; 
     dataGridView2.Rows[3].Cells[0].Value = "33333333"; 
     dataGridView2.Rows[4].Cells[0].Value = "44444444"; 
     dataGridView2.Rows[0].HeaderCell.Value = "0 - 1"; 
     dataGridView2.Rows[1].HeaderCell.Value = "1 - 2"; 
    } 
} 

}

Answer 1

试试这个

private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e) 
     { 
      if (e.RowIndex > -1 && e.ColumnIndex > -1) 
       dataGridView1.DoDragDrop(
        dataGridView1.Rows[e.RowIndex] 
           .Cells[e.ColumnIndex] 
           .Value.ToString(), 
        DragDropEffects.Copy); 
     } 

private void dataGridView1_DragDrop(object sender, DragEventArgs e) 
{ 
    if (e.Data.GetDataPresent(typeof(System.String))) 
    { 
     Point clientPoint = dataGridView1.PointToClient(new Point(e.X, e.Y)); 
     int rowIndex = dataGridView1.HitTest(clientPoint.X, clientPoint.Y).RowIndex; 
     int colIndex = dataGridView1.HitTest(clientPoint.X, clientPoint.Y).ColumnIndex; 
     if (rowIndex > -1 && colIndex > -1) 
      dataGridView1.Rows[rowIndex].Cells[colIndex].Value = 
          (System.String)e.Data.GetData(typeof(System.String)); 
    } 
}