Question

我需要在我的代码中添加一些逻辑，它将BooleanToVisibilityConverter设置为true或false，具体取决于我的MVVM模型中的XAML组合框中的选定值。更复杂的是，我实际上有2个组合框。组合框2中显示的列表取决于在组合框1中选择的值

组合框1 XAML

<ComboBox Margin="103,6,0,24" 
     x:Name="FirstOne" 
     Grid.Column="1" 
     DisplayMemberPath="SetCriteria" 
     ItemsSource="{Binding CriteriaList}" 
     SelectedItem="{Binding SelectedCriteriaLists, Mode=TwoWay}"/>

组合框1，代码隐藏

public void SearchViewModel()
    {
        this.CriteriaList = new ObservableCollection<SearchCriteriaList> 
        {
            new SearchCriteriaList {SetCriteria = "Date Range"},
            new SearchCriteriaList {SetCriteria = "Gateway"},
            new SearchCriteriaList {SetCriteria = "Direction"}
        };

              this.OperatorList = new ObservableCollection<SearchOperatorLists>();        
        }

组合框2 XAML

 <ComboBox Margin="103,41,1,40" 
                          x:Name="SecondOne" 
                          Grid.Column="1" 
                          Grid.RowSpan="2" 
                          DisplayMemberPath="OperatorName" 
                          ItemsSource="{Binding OperatorList}"/>

组合框2，代码隐藏

private readonly List<SearchOperatorLists> dateOperatorList = new List<SearchOperatorLists>
    {
        new SearchOperatorLists {OperatorName = "Today"},
        new SearchOperatorLists {OperatorName = "Between"},
        new SearchOperatorLists {OperatorName = "Last Month"}
    };

    private readonly List<SearchOperatorLists> gatewayOperatorList = new List<SearchOperatorLists>
    {
        new SearchOperatorLists {OperatorName = "CCSUK"},
        new SearchOperatorLists {OperatorName = "MCP"},
        new SearchOperatorLists {OperatorName = "CNS"},
        new SearchOperatorLists {OperatorName = "Email"}
    };

    private readonly List<SearchOperatorLists> directionOperatorList = new List<SearchOperatorLists>
    {
        new SearchOperatorLists {OperatorName = "In"},
        new SearchOperatorLists {OperatorName = "Out"}
    };

    private SearchCriteriaList selectedCriteriaList;

确定如此，只要在FirstOne组合框（日期范围，网关或方向）中选择了一个值，就会使用onPropertyChanged事件组合框2显示相应的列表（dateOperatorList，gatewayOperatorList，directionOperatorList）

我的要求是在组合框2中捕获一个值，说“Between”，然后将我的BooleanToVisibilityConverter设置为true。在这种情况下，将显示2个日期选择器。

非常感谢任何指针。

Answer 1

而是使用对象模型，其中主要项目（第一个组合）具有Children属性，其中包含第二个Combobox的项目。

这会使您的第二个Combobox Binding成为：

<ComboBox Margin="103,41,1,40" 
                      x:Name="SecondOne" 
                      Grid.Column="1" 
                      Grid.RowSpan="2" 
                      DisplayMemberPath="OperatorName" 
                      ItemsSource="{Binding SelectedCriteriaLists.Children}"/>

如果依赖对象列表发生变化，从长远来看，更简单，更少维护问题。

根据选定的组合框值将BooleanToVisibilityConverter设置为true

1 个答案: