如何在DataGridView中删除多行？ [英] How to delete multiple rows in DataGridView?

问题描述

我在winform上有一个DataGridView。下面是一个解决此问题的工作示例。网格有两列-复选框和文本框。我正在创建两行数据。

I have a DataGridView on a winform. Below is a working sample that repros the problem. The grid has two columns - checkbox and textbox. I'm creating two rows of data.

我遍历并获取任何选中的行。然后，我尝试将其删除。在我要删除行的循环中，所有操作在第一次迭代中都进展顺利。 r.Index 为0。

I loop through and get any checked row. Then I try to delete them. In the loop where I'm removing rows, all goes well on the first iteration. r.Index is 0.

进入第二次迭代是事物崩溃的地方。 r.Index 现在为-1， r.Cells [1] .Value 为空。

Coming into the second iteration is where things breakdown. r.Index is now -1 and r.Cells[1].Value is null.

为什么会这样，删除这些行的正确方法是什么？

Why is this happening and what is the right way to remove these rows?

public Form1() 
{
List<data> dataList = new List<data>();
dataList.Add(new data() {IsChecked=true, dept="dept1"});
dataList.Add(new data() {IsChecked=true, dept="dept2"});
BindingListView<data> view = new BindingListView<data>(dataList);
dataGridView1.DataSource = view;

var rows = SelectedRows();
foreach (DataGridViewRow r in rows) {
  var name = r.Cells[1].Value.ToString();
  dataGridView1.Rows.Remove(r);
}

List<DataGridViewRow> SelectedRows() {
  List<DataGridViewRow> rows = new List<DataGridViewRow>();
  foreach (DataGridViewRow row in dataGridView1.Rows) {
    if (Convert.ToBoolean(row.Cells[0].Value)) {
      rows.Add(row);
    }
   }
   return rows;
}

}


public class data 
{
  public bool IsChecked {get;set;}
  public string dept {get;set;}
}

BindingListView类来自这里： http://blw.sourceforge.net

BindingListView class comes from here: http://blw.sourceforge.net

推荐答案

您可以从 BindingListView< Data> 中删除​​选中的项目。更改将立即显示在 DataGridView 中。

You can remove checked item from the BindingListView<Data>. The changes will be shown in DataGridView immediately.

foreach (var item in view.ToList())
{
    if (item.IsChecked)
        view.Remove(item);
}

使用 ToList（）创建另一个在循环中使用的 List< Data> ，因此允许从原始列表中删除该项目，并且不会更改我们在循环中使用的列表。

Using ToList() creates a different List<Data> which is used in the loop, so removing the item from original list is allowed and doesn't change the list we used in the loop.

另外，您还可以通过这种方式从 DataGridView 中删除​​行。更改将立即在 BindingListView< Data> 中进行：

Also as another option, you can remove the row from DataGridView this way. The changes will be made in the BindingListView<Data> immediately:

dataGridView1.Rows.Cast<DataGridViewRow>()
    .Where(row => (bool?)row.Cells[0].Value == true)
    .ToList().ForEach(row =>
    {
        dataGridView1.Rows.Remove(row);
    });

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