如何：对 DataGrid 的项目进行排序

Question

如何：使用 C#/WPF 对 DataGrid 的项目进行排序

我确实有以下代码sn-ps（不重要的代码已被删除）：

C#：

lastName.SortDirection = ListSortDirection.Ascending;

XAML：

<DataGrid AutoGenerateColumns="False" Name="dataGrid_Content">
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding lastName}" Header="Nachname" x:Name="lastName" />
    </DataGrid.Columns>
</DataGrid>

不幸的是，C# 代码被忽略了 - 没有升序排序，它只创建显示的小箭头，但项目没有排序。我的错误是什么？

编辑我：

public void SetItemsToDataContext()
    {
        dataGrid_Content.Items.Clear();

        foreach (string s in Directory.GetFiles(@"C:\Users\...", "*.txt"))
        {
            StreamReader streamReader = new StreamReader(s);

            int i = 1;
            string line = streamReader.ReadToEnd().Replace("\n", "");
            string[] t = line.Split('\r');

            BusinessContact businessContact = new BusinessContact();
            businessContact.firstName = t[i + 2];
            businessContact.lastName = t[i + 3];

            dataGrid_Content.Items.Add(businessContact);

            streamReader.Close();
        }

        applySortDescriptions(lastName, ListSortDirection.Ascending);
    }

编辑二：

public string getSortPropertyName(DataGridColumn col)
{
    return "Content";
}

Answer 1

嗯，有一种方法可以让它正常工作。在这里。

    private void applySortDescriptions(DataGridColumn col, ListSortDirection listSortDirection)
    {
        //Clear current sort descriptions
        MyDataGrid.Items.SortDescriptions.Clear();

        //Get property name to apply sort based on desired column
        string propertyName = getSortPropertyName(col);           

        //Add the new sort description
        MyDataGrid.Items.SortDescriptions.Add(new SortDescription(propertyName, listSortDirection));

        //apply sort
        applySortDirection(col, listSortDirection);           

        //refresh items to display sort
        MyDataGrid.Items.Refresh();
    }

    private string getSortPropertyName(DataGridColumn col)
    {
        //place logic in here that will return the name of the property to sort by (ex: return “name”; if you are sorting by the name property)

        return string.Empty;
    }

    private void applySortDirection(DataGridColumn col, ListSortDirection listSortDirection)
    {
        foreach (DataGridColumn c in PatientsViewDatGrid.Columns)
        {
            c.SortDirection = null;
        }
        col.SortDirection = listSortDirection;
    }

应该这样做。现在您可以进行排序，列标题将适当地显示排序指示符