MahApps.Metro SplitButton SelectedItem 数据绑定

MahApps.Metro SplitButton SelectedItem Databinding

视图是:

  <Controls:SplitButton Margin="217,409.75,56,185" Name="SplitButton1"
                              Width="384"
                              HorizontalAlignment="Center"
                              HorizontalContentAlignment="Center"
                              VerticalContentAlignment="Center"
                              Orientation="Vertical" 
                              DisplayMemberPath ="UserName"
                              SelectedItem="{Binding SelectedUser,UpdateSourceTrigger=PropertyChanged,Mode=OneWay}"
                              ItemsSource="{Binding Users, Mode=TwoWay}" />

ViewModel 是:

        public string SelectedUser 
    {
        get { return selectedUser; }
        set
        {
            selectedUser = value;
            RaisePropertyChanged("SelectedUser");
        }
    }

    public ObservableCollection<UserModel> Users
    {
        get
        {
            return users;
        }
        set
        {
            users = value;
        }
    }

型号是:

public class UserModel
{
    private int id;
    private string userName;
    private int groupId;
    private string deviceMacAddress;

    public int Id { get; set; }
    public string UserName { get; set; }
    public int GroupId { get; set; }
    public string DeviceMacAddress { get; set; }
}

我在xaml中使用上面的代码将splitbutton中的selectedItem绑定到ViewModel->属性--SelectedUser.
但它不起作用。有人知道为什么吗?

SelectedUser 作为模型名称 (PresentationLayer.Model.UserModel) 而不是 UserName 属性返回。

因为根据您的定义,您的绑定是 OneWay

将绑定设置为 TwoWay

<Controls:SplitButton SelectedItem="{Binding SelectedUser,Mode=TwoWay}"/>

而且,在这种情况下不需要设置UpdateSourceTrigger=PropertyChanged,因为UpdateSourceTrigger默认为PropertyChanged SelectedItem 属性 .