如果DataGrid列被排序（而不是排序），我如何被通知 [英] How can I be notified if a DataGrid column is sorted (and not sorting)

问题描述

我需要为排序事件。一个WPF应用程序中的aspxrel =noreferrer> DataGrid ，但找不到方法。

I need to have kind of an Sorted event for a DataGrid in a WPF application but cannot find a way to get it.

这是我试过的：

DataGrid 提供一个事件 排序 ，但是我不能使用它，因为它在排序完成之前被触发。 EventArgs 给我列出排序的列，而不是排序的方式，如果我将排序方向设置为旧值。当然，我可以猜测它会是什么，因为我知道它从没有升到升序，最后还是下降，但是如果控件的行为发生变化，那将不会解决。

The DataGrid provides an event Sorting, but I cannot use it as it is fired before the sorting is done. The EventArgs give me the column which is sorted but not the way it is sorted and if I get the sort direction it is set to the old value. Of course I could guess what it will be as I know that it flips from none to ascending and finally to descending but that would be no solution as it would fail if the behavior of the control changes.

第二次尝试：

DataGrid 具有默认视图，可以访问 SortDescriptionCollection 。这个集合包含所有的排序属性，但是我看不到有任何可能的通知我的更改。

The DataGrid has a default view which provides access to a SortDescriptionCollection. This collection holds all sorting properties but I don't see any possibility to let me inform about changes.

我不得不说，我正在寻找一个清洁的解决方案尽可能的，因为它将被用于一个大型项目，在这个大型项目中我无法使用可能会导致环境变化的解决方案。

I have to say that I'm looking for a solution as clean as possible as it will be used in a large project on which I can't use solutions which could fail if the environment changes.

有没有人从经验（或文档） ？）我如何解决这个问题？

Does anyone know from experience (or documentation?) how I could solve this problem?

编辑：要更清楚我想要实现的目标： code> DataGrid 列按用户排序列的方向进行排序。这个信息没有必要在排序本身之后，它只是必须是正确的;）

To make more clear what I want to achieve: I need to get informed which DataGrid column is sorted in which direction when a user sort a column. It is not necessary that this information comes after the sorting itself, it just has to be correct ;)

推荐答案

我实现了Sorted对于DataGrid事件，我自己通过覆盖DataGrid如下：

I implemented the Sorted for the DataGrid event myself by overriding the DataGrid as follows:

public class ValueEventArgs<T> : EventArgs
{
    public ValueEventArgs(T value)
    {
        Value = value;
    }

    public T Value { get; set; }

}

public class DataGridExt : DataGrid
{
    public event EventHandler<ValueEventArgs<DataGridColumn>> Sorted;

    protected override void OnSorting(DataGridSortingEventArgs eventArgs)
    {
        base.OnSorting(eventArgs);

        if (Sorted == null) return;
        var column = eventArgs.Column;
        Sorted(this, new ValueEventArgs<DataGridColumn>(column));
    }
}

为了使用它，所有你需要做的是这样的：

In order to use it then all you need to do is this:

    private void Initialize()
    {
            myGrid.Sorted += OnSorted;
    }
    private void OnSorted(object sender, ValueEventArgs<DataGridColumn> valueEventArgs)
    {
    // Persist Sort...
    }

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