不按控制键选择多行 [英] Select multiple Rows without pressing Control Key

问题描述

我有一个 gridview，我可以通过按控制键来选择多行.是否可以在不按控制键的情况下实现相同的效果.

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.

推荐答案

由于 .net 默认操作也会更新 datagridview 的 slectedrows，因此您需要有一个保留旧选择的数组:

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; 

将在 CellMouseDown 更新(在默认 .net 操作修改您的选择之前):

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);  
}

之后，您可以在 RowHeaderMouseClick 中进行更改(因为 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:

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;
        }    
    }  
}

更好的解决方案:
您需要实现自己的 datagridview 派生自原始代码并覆盖 OnCellMouseDown&OnCellMouseClick 以取消默认取消选择操作并使其平滑.像这样创建一个新类:

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);
    }
}

并在您的 Form.Designer.cs 中将 DataGridView 对象 datagridview1(如果这是名称)更改为 myDataGridView 对象......

and in your Form.Designer.cs change DataGridView object datagridview1 (if that is the name) to myDataGridView object......

例如:更改

私有 System.Windows.Forms.DataGridView dataGridView1; to

private myDataGridView dataGridView1;

和改变

this.dataGridView1=new System.Windows.Forms.DataGridView() 到

this.dataGridView1=new myDataGridView ()

这篇关于不按控制键选择多行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！