Question

我在Uwp用户控件中有一个ComboBox，我想将SelectedValue属性直接绑定到控件的Dependency属性，所以我可以直接设置/获取值

这是用户控件的内容

<Grid>
    <ComboBox x:Name="clientiList" HorizontalAlignment="Left" Margin="10,10,0,0" 
        VerticalAlignment="Top" 
        Width="300"
        SelectedValuePath="ClienteNo" 
        DisplayMemberPath="Descrizione" 
        SelectedValue="{Binding idCliente, ElementName=userControl, Mode=TwoWay}" />
</Grid>

这是控件中的代码

public int ?idCliente {
    get { return IdCliente;  }
    set { IdCliente = value; }
}
public int ?IdCliente
{
    get { return (int?)GetValue(IdClienteProperty); }
    set { SetValue(IdClienteProperty, value); }
}

public static readonly DependencyProperty IdClienteProperty =
    DependencyProperty.Register("IdCliente", typeof(int?), typeof(ClientiAttiviSelect), new PropertyMetadata(null));

我看到如果我在列表中选择一个值时将SelectedValue属性绑定到 IdCliente 属性，我会在输出窗口中看到此错误

Error: Converter failed to convert value of type 'Windows.Foundation.Int32' to type 'IReference`1<Int32>'; BindingExpression: Path='IdCliente' DataItem='MyAttivita.Features.Cliente.Views.ClientiAttiviSelect'; target element is 'Windows.UI.Xaml.Controls.ComboBox' (Name='clientiList'); target property is 'SelectedValue' (type 'Object').

如果我将SelectedValue绑定到 idCliente 属性并使用它来更新 IdCliente 属性，则它可以正常工作。
为什么会这样？我怎样才能避免这种重复？

Uwp将组合框选择的值绑定到依赖属性

0 个答案: