WPF MVVM ComboBox标签选择

Question

我有一个ComboBox,它有一个声明的ComboBox.Items列表(换句话说,不是通过ItemsSource动态绑定).我使用ComboBoxItem.Content作为显示名称,使用ComboBoxItem.Tag作为相应的Id,如下所示.

如何获取所选项目的标签而不是内容？我试过了SelectedItemValuePath="Tag",但那不起作用.

    <ComboBox Visibility="{Binding Path=ShowOutpatientFields, Converter=   
        {StaticResource   
            boolTovisConverter}}" Grid.Row="5" Grid.Column="2" Margin="0,2,0,2"  
        Text="{Binding Path=NewCase.ServiceType, ValidatesOnDataErrors=true,  
        NotifyOnValidationError=true}" SelectedValuePath="Tag">
          <ComboBox.Items>
             <ComboBoxItem Content="Hospice" Tag="33" />
             <ComboBoxItem Content="Hospital Outpatient" Tag="36" />
             <ComboBoxItem Content="Hospital Inpatient Extension" Tag="128" />
             <ComboBoxItem Content="Maternity" Tag="52" />
          </ComboBox.Items>
    </ComboBox>

Answer 1

如果您在ViewModel类中具有此属性:

 private string _serviceType;
 public string ServiceType
 {
     get { return _serviceType; }
     set { _serviceType = value; }
 }

当然你可以拥有int类型的属性,它也会工作.

试试这个绑定:

<ComboBox VerticalAlignment="Center" Margin="0,2,0,2"  
                SelectedValue="{Binding ServiceType}"
                SelectedValuePath="Tag">
            <ComboBox.Items>
                <ComboBoxItem Content="Hospice" Tag="33" />
                <ComboBoxItem Content="Hospital Outpatient" Tag="36" />
                <ComboBoxItem Content="Hospital Inpatient Extension" Tag="128" />
                <ComboBoxItem Content="Maternity" Tag="52" />
            </ComboBox.Items>
        </ComboBox>