我在XAML定义如下一些排序一个DataGrid：

 ＆LT; CollectionViewSource X：关键=DefaultSort来源={结合的SearchResult}＆GT;
    ＆LT; CollectionViewSource.SortDescriptions＆GT;
        ＆LT; SCM：SortDescription属性名=ExternalOrgNo方向=升序/＆GT;
        ＆LT; SCM：SortDescription属性名=ExternalBranchNumber方向=升序/＆GT;
    ＆LT; /CollectionViewSource.SortDescriptions>
＆LT; / CollectionViewSource＆GT;
 

排序是正确应用到DataGrid，但没有迹象显示对电网的排序。

看着在code中的观点的背后，我看到的集合中的SortDescriptions，我已经试过刷新视图，但没有奏效。

我怎么能有箭头的columnHeader正确反映视图的SortDescription收集的状态开始？

更新：我找到了答案。我加入了SortDirection到DataGrid中的DataGridTextColumn。这增加了的columnHeader箭头。

 ＆LT; D​​ataGridTextColumn标题=外部事务所＃绑定={结合ExternalOrgNo}的DisplayIndex =4SortDirection =升序能见度=可见/＆GT;
＆LT; D​​ataGridTextColumn标题=外部分行＃绑定={结合ExternalBranchNumber}的DisplayIndex =5SortDirection =升序能见度=可见/＆GT;
 

解决方案

在OP不像是一个普通访客，直到那一刻，我发表了他的解决方案作为一个答案：

添加 SortDirection 的 DataGridTextColumn 中的 的DataGrid 。这增加了的columnHeader 箭头。

 ＆LT; D​​ataGridTextColumn标题=外部事务所＃
                    绑定={结合ExternalOrgNo}
                    的DisplayIndex =4
                    SortDirection =升序
                    能见度=可见/＆GT;
＆LT; D​​ataGridTextColumn标题=外部分行＃
                    绑定={结合ExternalBranchNumber}
                    的DisplayIndex =5
                    SortDirection =升序
                    能见度=可见/＆GT;
 

I have a DataGrid with some sorting defined in XAML like so:

<CollectionViewSource x:Key="DefaultSort" Source="{Binding SearchResults}">
    <CollectionViewSource.SortDescriptions>
        <scm:SortDescription PropertyName="ExternalOrgNo" Direction="Ascending"/>
        <scm:SortDescription PropertyName="ExternalBranchNumber" Direction="Ascending"/>
    </CollectionViewSource.SortDescriptions>
</CollectionViewSource>

The sorting is properly applied to the DataGrid but there is no indication of the sorting on the grid.

Looking at the view in the code behind I see the SortDescriptions in the collection and I've tried refreshing the view but it did not work.

How can I have the ColumnHeader arrows properly reflect the status of the view's SortDescription collection initially?

UPDATE: I found an answer. I added the SortDirection to the DataGridTextColumn in the DataGrid. This added the ColumnHeader arrows.

<DataGridTextColumn Header="Ext Firm #" Binding="{Binding ExternalOrgNo}" DisplayIndex="4" SortDirection="Ascending" Visibility="Visible" />
<DataGridTextColumn Header="Ext Branch #" Binding="{Binding ExternalBranchNumber}" DisplayIndex="5" SortDirection="Ascending" Visibility="Visible" />

The OP doesn't look like to be a regular visitor so until that moment I post his solution as an answer:

Add the SortDirection to the DataGridTextColumn in the DataGrid. This added the ColumnHeader arrows.

<DataGridTextColumn Header="Ext Firm #" 
                    Binding="{Binding ExternalOrgNo}" 
                    DisplayIndex="4" 
                    SortDirection="Ascending" 
                    Visibility="Visible" />
<DataGridTextColumn Header="Ext Branch #" 
                    Binding="{Binding ExternalBranchNumber}" 
                    DisplayIndex="5" 
                    SortDirection="Ascending" 
                    Visibility="Visible" />