从 WPF 数据网格中删除行
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/14031814/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Removing rows from a WPF datagrid
提问by Thomas
I have a WPF DataGrid theDataGridbound to a DataSet dscontaining a table. I want to enable the user to remove lines by first selecting them in the grid and then pressing a button (positioned somwhere outside of the datagrid). I finally arrived at the following lines of code which do what I want, but which I consider rather ugly:
我有一个 WPFDataGrid theDataGrid绑定到一个DataSet ds包含表的。我想让用户通过首先在网格中选择它们然后按下按钮（位于数据网格之外的某个位置）来删除线。我终于得到了以下代码行，它们可以满足我的要求，但我认为它们相当丑陋：
DataSet ds = new DataSet();
...
// fill ds somehow
...
private void ButtonClickHandler(object Sender, RoutedEventArgs e)
{
List<DataRow> theRows = new List<DataRow>();
for (int i = 0; i < theDataGrid.SelectedItems.Count; ++i)
{
// o is only introduced to be able to inspect it during debugging
Object o = theDataGrid.SelectedItems[i];
if (o != CollectionView.NewItemPlaceholder)
{
DataRowView r = (DataRowView)o;
theRows.Add(r.Row);
}
}
foreach(DataRow r in theRows)
{
int k = ds.Tables["producer"].Rows.IndexOf(r);
// don't remove() but delete() cause of update later on
ds.Tables[0].Rows[k].Delete();
}
}
Is there a better way to do this? E.g. one which needs only one loop and without having to check for the NewItemPlaceHolderexplicitly, or possible a more efficient way to access the rows which are to be deleted?
有一个更好的方法吗？例如，只需要一个循环而无需NewItemPlaceHolder显式检查的，或者可能是一种更有效的方式来访问要删除的行？
(I already figured out that I must not remove anything from the ds in the first loop, since then theDataGrid.SelectedItems.Countchanges everytime the loop is executed...)
（我已经发现我不能在第一个循环中从 ds 中删除任何内容，因为theDataGrid.SelectedItems.Count每次执行循环时都会发生变化......）
回答by apomene
In order to remove row selected on button click you can try:
为了删除按钮单击时选择的行，您可以尝试：
private void ButtonClickHandler(object sender, RoutedEventArgs e)//Remove row selected
{
DataRowView dataRow = (DataRowView)dataGridCodes.SelectedItem; //dataRow holds the selection
dataRow.Delete();
}
回答by Ramin
I think it works by just one loop:
我认为它只通过一个循环起作用：
int count=theDataGrid.SelectedItems.Count;
int removedCount=0;
while (removedCount < count)
{
try{
Object o = theDataGrid.SelectedItems[0];
}
catch{ break;}
if (o == CollectionView.NewItemPlaceholder)
continue;
DataRowView r = (DataRowView)o;
r.Row.Delete();
removedCount++;
}
回答by John B
You can remove the double loop by iterating backwards :
您可以通过向后迭代来删除双循环：
private void ButtonClickHandler(object Sender, RoutedEventArgs e) {
for (int i = theDataGrid.SelectedItems.Count-1; i>=0; --i)
if (theDataGrid.SelectedItems[i] != CollectionView.NewItemPlaceholder)
ds.Tables[0].Rows[i].Delete();
}
