我使用此代碼向datagrid添加或刪除列。每個列標題我有鼠標進入和離開事件。對於新列,我也想在插入到datagrid後添加相同的事件處理程序。Datagrid Column Collection更改事件
private void Columns_CollectionChanged(object sender, System.ComponentModel.CollectionChangeEventArgs e)
{
if (e.Action == CollectionChangeAction.Add)
{
int columnPosition = (this.Columns.Count - 1);
DataGridTextColumn column = new DataGridTextColumn();
column.Header = (e.Element as DataColumn).ColumnName;
column.Binding = new Binding(string.Format("[{0}]", column.Header.ToString()));
this.Columns.Insert(columnPosition, column);
DataGridColumnHeader columnHeader = DataGridHelper.GetColumnHeader(this, columnPosition);
if (columnHeader != null)
{
columnHeader.MouseEnter += new MouseEventHandler(ColumnHeader_MouseEnter);
columnHeader.MouseLeave += new MouseEventHandler(ColumnHeader_MouseLeave);
}
SetAutomappingOnOff = false;
}
else if (e.Action == CollectionChangeAction.Remove)
{
DataColumn column = e.Element as DataColumn;
DataGridColumn toRemove = (from DataGridColumn dc in this.Columns
where dc.Header != null && dc.Header.ToString() == column.ColumnName
select dc).First();
this.Columns.Remove(toRemove);
SetAutomappingOnOff = false;
}
}
<編輯>
DataGridHelper
public static class DataGridHelper
{
public static DataGridColumnHeader GetColumnHeader(DataGrid dataGrid, int index)
{
DataGridColumnHeadersPresenter presenter = FindVisualChild<DataGridColumnHeadersPresenter>(dataGrid);
if (presenter != null) {
return (DataGridColumnHeader)presenter.ItemContainerGenerator.ContainerFromIndex(index);
}
return null;
}
}
< /編輯>
不過的columnHeader始終返回null,即使我可以看到該對象被創建並添加到datagrid。
請幫我。
感謝 迪
什麼是DataGridHelper,它是如何獲得列標題的? –
公共靜態類DataGridHelper { 公共靜態DataGridColumnHeader GetColumnHeader(數據網格的數據網格,INT指數) { DataGridColumnHeadersPresenter演示= FindVisualChild(的數據網格); if(presenter!= null) { return(DataGridColumnHeader)presenter.ItemContainerGenerator.ContainerFromIndex(index); } return null; }} –