DataGridComboBoxColumn 初始值不显示

DataGridComboBoxColumn initial value not displaying

我有一个绑定到枚举的 DataGridComboBoxColumn。下拉列表正确显示枚举的值,但组合框最初不显示任何值。我正在尝试将所选值绑定到作为我的 DataGrid 源的 DataTable 的性别 属性。我已经在 SelectedItemBinding="{Binding Gender}"SelectedValueBinding="{Binding Gender}" 等类似问题中尝试过这些方法,但它们对我不起作用。

我也曾尝试在 DataGridTemplateColumn 中放置一个组合框,但它最初不显示性别值我已尝试 SelectedValue="{Binding Gender}"SelectedValuePath="{Binding Gender}" 但无济于事。 SelectedIndex = "0" 有效,但它对我没有用,因为我希望初始值来自 属性。

当我将 属性 绑定到 DataGridTextColumn 时绑定有效,因为它显示正确的值,即 male/female.

XAML:

<ObjectDataProvider x:Key="genderEnum" xmlns:sys="clr-namespace:System;assembly=mscorlib" MethodName="GetValues" ObjectType="{x:Type sys:Enum}">
    <ObjectDataProvider.MethodParameters>
        <x:Type TypeName="enumLoc:Gender"/>
    </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<Grid DataContext="ViewMembers.xaml.cs">
    <DataGrid x:Name="memberDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding Path=memberTable, Mode=TwoWay}" RowDetailsVisibilityMode="VisibleWhenSelected" Width="1200" Height="600" GridLinesVisibility="None" >
        <DataGrid.Columns>                
            <DataGridComboBoxColumn x:Name="memberGenderColumn" SelectedItemBinding="{Binding Gender}" ItemsSource="{Binding Source={StaticResource genderEnum}}"  Header="Gender" Width="60">
            <DataGridTemplateColumn Header="Gender">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox ItemsSource="{Binding Source={StaticResource genderEnum}}" SelectedValue="{Binding Gender}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>

XAML.cs:

    DataTable memberTable = new DataTable();
    MemberDatabase members = MemberDatabase.GetApplicationDatabase();

    public ViewMembers()
    {
        InitializeComponent();
        memberTable = members.GetAllMembers();
        memberTable.AsEnumerable().ToList().ForEach(row =>
        {
            var cellList = row.ItemArray.ToList();
            row.ItemArray = cellList.Select(x => x.ToString().Trim()).ToArray();
        });
        this.DataContext = memberTable;
        memberDataGrid.ItemsSource = memberTable.DefaultView;
    }

您可以通过创建一个非常简单的转换器 class 来完成这项工作,该转换器从 int 转换为您的枚举:

public class EnumConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (Gender)value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value;
    }
}

XAML:

<DataGrid x:Name="memberDataGrid" ...>
    <DataGrid.Resources>
        <local:EnumConverter x:Key="EnumConverter" />
    </DataGrid.Resources>
    <DataGrid.Columns>
        <DataGridComboBoxColumn x:Name="memberGenderColumn" 
                                SelectedItemBinding="{Binding Gender, Converter={StaticResource EnumConverter}}" 
                                ItemsSource="{Binding Source={StaticResource genderEnum}}" Header="Gender" Width="60">
        </DataGridComboBoxColumn>
    </DataGrid.Columns>
</DataGrid>