不按控制键就可以选择多行 [英] Select multiple Rows without pressing Control Key

问题描述

我有一个gridview，我可以通过按下一个控制键来选择多行。是否有可能在没有按下控制键的情况下实现同样的功能。

解决方案

由于.net默认动作也会更新<$ code> datagridview 您需要有一个数组来保留旧选择：

  DataGridViewRow [] old; 
  

将在 CellMouseDown 默认的.net动作修改你的选择）：
$ b $ pre $ code private void dataGridView1_CellMouseDown（object sender，DataGridViewCellMouseEventArgs e）
{
old = new DataGridViewRow [dataGridView1.SelectedRows.Count];
dataGridView1.SelectedRows.CopyTo（old，0）;
}

之后，您可以在 RowHeaderMouseClick （如 RowHeaderSelect 是默认的datagridview selectionmode ）或使用 CellMouseClick 用于 FullRowSelect 并重新选择那些旧的选定行：



  private void dataGridView1_RowHeaderMouseClick（object sender，DataGridViewCellMouseEventArgs e）
 {
 foreach（旧的DataGridViewRow gr）
 {
 if（gr == dataGridView1.CurrentRow）
 {
 gr.Selected = false; 
} 
 else 
 {
 gr.Selected = true; 
} 
} 
} 
  

编辑：更好解决方案：

您需要实现自己的 datagridview 从原始派生而来，并覆盖 OnCellMouseDown & OnCellMouseClick 取消默认的取消选择操作并使其平滑。使一个新的类如下所示：

 使用System; 
使用System.Windows.Forms; 
 
 public class myDataGridView：DataGridView 
 {
 protected override void OnCellMouseDown（DataGridViewCellMouseEventArgs e）
 {
 //base.OnCellMouseDown（e）; 
 this.Rows [e.RowIndex] .Selected =！this.Rows [e.RowIndex] .Selected; 
} 
 
保护覆盖无效OnCellMouseClick（DataGridViewCellMouseEventArgs e）
 {
 //base.OnCellMouseClick（）; 
 
 
 $ / code $ / pre 
 
 
并在Form.Designer.cs中更改 DataGridView  object  datagridview1 （如果这是名称）为 myDataGridView 对象...... 
 
 
 
例如：Change 
 
 
 
  private System.Windows .Forms.DataGridView dataGridView1;  to 
  private myDataGridView dataGridView1; 
  
并更改 
 
 
  this.dataGridView1 = new System.Windows.Forms.DataGridView（） to 
  this。 dataGridView1 = new myDataGridView（）
  
 
I have a gridview where I can select multiple rows by pressing a control key. Is it possible to achieve the same without pressing a control key.
解决方案
As the .net default action will also update the slectedrows of your datagridview you need to have an array to reserve the old selections:
DataGridViewRow[] old; 
which will be updated at CellMouseDown (before the default .net action modify your selections):
private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
{
    old = new DataGridViewRow[dataGridView1.SelectedRows.Count];
    dataGridView1.SelectedRows.CopyTo(old,0);  
}
after that, you can do your changes in RowHeaderMouseClick (as RowHeaderSelect is the default datagridview selectionmode) or use CellMouseClick for FullRowSelect and reselect those old selected rows: 
private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{    
    foreach (DataGridViewRow gr in old)
    {
        if (gr == dataGridView1.CurrentRow)
        {
            gr.Selected = false;
        }
        else
        {
            gr.Selected = true;
        }    
    }  
}
Edit: Better solution:

You need to implement your own datagridview derived from the original one and override OnCellMouseDown&OnCellMouseClick to cancel the default deselect action and make it smooth. make a new Class as something like this:
Using System;
Using System.Windows.Forms;

public class myDataGridView:DataGridView
{
    protected override void OnCellMouseDown(DataGridViewCellMouseEventArgs e)
    {
        //base.OnCellMouseDown(e);
        this.Rows[e.RowIndex].Selected = !this.Rows[e.RowIndex].Selected;
    }

    protected override void OnCellMouseClick(DataGridViewCellMouseEventArgs e)
    {
        //base.OnCellMouseClick(e);
    }
}
and in your Form.Designer.cs change DataGridView object datagridview1 (if that is the name) to myDataGridView object...... 


For example:Change 

private System.Windows.Forms.DataGridView dataGridView1; to
private myDataGridView dataGridView1;
and change

this.dataGridView1=new System.Windows.Forms.DataGridView() to
this.dataGridView1=new myDataGridView ()


                        
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