如何从DataGridColumn获取DataGridColumnHeader？

问题描述

我的代码如下::::

My code is as follows ::::

 void mainDataContextObj_CutSelectedColumnEvent(string columnId)
    {
        IList<DataGridColumn> columns = dg.Columns;

        for(int i=2; i<dg.Columns.Count; i++)
        {
            DataGridColumnHeader headerObj = dg.Columns[i].Header as DataGridColumnHeader;

             //This always returns headerObj as null!!!

        }
    }

我需要从列中DataGridColumnHeader。我哪里错了？请帮助!!

I need DataGridColumnHeader from column. Where am I going wrong?? Please help!!

推荐答案

DataGridColumn的Header对象实际上是该列的可见头，无论您设置为。 DataGridColumn不是Visual Tree的一部分，所以没有直接方法来访问DataGridColumnHeader（我们甚至不能确定它存在）。但是你可以这样做来尝试访问它。

The Header object of the DataGridColumn is actually the visible header of that column, whatever you set it to be. DataGridColumn is not part of the Visual Tree so there is not direct way to access the DataGridColumnHeader for it (we can't even be sure it exists yet). But you can do something like this to try and access it

DataGridColumnHeader headerObj = GetColumnHeaderFromColumn(column);

private DataGridColumnHeader GetColumnHeaderFromColumn(DataGridColumn column)
{
    // dataGrid is the name of your DataGrid. In this case Name="dataGrid"
    List<DataGridColumnHeader> columnHeaders = GetVisualChildCollection<DataGridColumnHeader>(dataGrid);
    foreach (DataGridColumnHeader columnHeader in columnHeaders)
    {
        if (columnHeader.Column == column)
        {
            return columnHeader;
        }
    }
    return null;
}

public List<T> GetVisualChildCollection<T>(object parent) where T : Visual
{
    List<T> visualCollection = new List<T>();
    GetVisualChildCollection(parent as DependencyObject, visualCollection);
    return visualCollection;
}

private void GetVisualChildCollection<T>(DependencyObject parent, List<T> visualCollection) where T : Visual
{
    int count = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < count; i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(parent, i);
        if (child is T)
        {
            visualCollection.Add(child as T);
        }
        else if (child != null)
        {
            GetVisualChildCollection(child, visualCollection);
        }
    }
}

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