MahApps.Metro SplitButton SelectedItem数据绑定

时间:2015-02-13 20:14:52

标签: wpf split-button

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;
        }
    }

模型是:

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-&gt;属性 - SelectedUser。 但它不起作用。有谁知道为什么?

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

1 个答案:

答案 0 :(得分:2)

因为您的定义绑定为OneWay

将绑定设置为TwoWay

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

并且,在这种情况下无需设置UpdateSourceTrigger=PropertyChanged,因为UpdateSourceTrigger属性PropertyChanged默认为SelectedItem