c# - OnPropertyChanged 上的 "Property Get method was not found"错误

Question

我得到了错误

Additional information: Property Get method was not found when invoking OnPropertyChanged.

我的想法是我有一个 ListView有多个项目可供选择和SelectionMode="Multiple" .每次在 ListView 中单击一个项目我想将它添加到 ObservableCollection<Inspection> .

目前我是这样做的:

Xaml:

<ListView x:Name="Reports"
                  Margin="0,5,0,0"
                  RelativePanel.Below="ListViewHeader"
                  SelectionMode="Multiple"
                  ItemsSource="{Binding inspectionCatalogSingleton.Inspections}"
                  SelectedItem="{Binding SelectedInspections, Mode=TwoWay}">
</ListView>

View 模型:

public ReportViewModel()
{
    _selectedInspections = new ObservableCollection<Inspection>();
}

private ObservableCollection<Inspection> _selectedInspections; 
public Inspection SelectedInspections
{
    set
    {
        _selectedInspections.Add(value);
        OnPropertyChanged();
    }
} 

/*....*/

public event PropertyChangedEventHandler PropertyChanged;

[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

我在属性的 set 部分设置了一个断点，它进入正常但是当我单击继续时错误在这一行上升:

PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

我在这里做错了什么？

Answer 1

由于 OnPropertyChanged 将指示 wpf 更新所有引用的绑定(bind)，因此它需要一种获取属性值的方法。

您的 Property SelectedInspections 缺少 Getter。这就是您收到此异常/错误消息的原因。