DataGridColumnHeader ContextMenu以编程方式 [英] DataGridColumnHeader ContextMenu programmatically

问题描述

我在View.cs中有这个代码

I have this code in View.cs

var contextMenu = this.dataGridFacade.GiveContextMenuForDataGrid(this.DataGridAllJobs);

this.DataGridAllJobs.ContextMenu = contextMenu;

但是我想为标题添加这个上下文菜单。可以吗？

But I want to add this context menu for header only. Is it possible?

推荐答案

你只需要检索 DataGridColumnHeadersPresenter 并设置其ContextMenu。

You just have to retrieve the DataGridColumnHeadersPresenter of your DataGrid and set its ContextMenu.

var contextMenu = this.dataGridFacade.GiveContextMenuForDataGrid(this.DataGridAllJobs);
var columnHeadersPresenter = this.DataGridAllJobs.SafeFindDescendant<DataGridColumnHeadersPresenter>(ip => ip.Name == "PART_ColumnHeadersPresenter");
if (columnHeadersPresenter != null)
{
    columnHeadersPresenter.ContextMenu = contextMenu;
}

这里是SafeFindDescendant扩展方法：

And here is the SafeFindDescendant extension method :

public static class Visual_ExtensionMethods
{
    /// <summary>
    /// Retrieves the first Descendant of the currren Visual in the VisualTree matching the given predicate
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="this">The current Visual.</param>
    /// <param name="predicate">An optional predicate that the descendant have to satisfy.</param>
    /// <returns></returns>
    public static T SafeFindDescendant<T>(this Visual @this, Predicate<T> predicate = null) where T : Visual
    {
        T result = null;
        if (@this == null)
        {
            return null;
        }

        // iterate on VisualTree children thanks to VisualTreeHelper
        int childrenCount = VisualTreeHelper.GetChildrenCount(@this);
        for (int i = 0; i < childrenCount; i++)
        {
            var currentChild = VisualTreeHelper.GetChild(@this, i);

            var typedChild = currentChild as T;
            if (typedChild == null)
            {
                // recursive search
                result = ((Visual)currentChild).SafeFindDescendant<T>(predicate);
                if (result != null)
                {
                    break;
                }
            }
            else
            {
                if (predicate == null || predicate(typedChild))
                {
                    result = typedChild;
                    break;
                }
            }
        }

        return result;
    }
}

这篇关于DataGridColumnHeader ContextMenu以编程方式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！