我有一个包含四个ComboBoxint1, 2, 3, 4。在此之下,我有一个GroupBox。我想做的就是根据ComboBox的值在GroupBox中显示唯一的内容。即对于TextBlock可能是TextBox1,对于Button可能是2

当前,我有四个单独的GroupBoxes彼此叠放,并且将那些VisibilityGroupBoxes属性绑定(bind)到bool中的唯一ViewModel属性,该属性在SelectedItemComboBox更改时设置。但是我感觉有一种方法可以压缩它,只保留一个GroupBox并用正确的内容填充它,而不用拥有四个单独的IsVisible属性和四个单独的ojit_code属性。

<ComboBox ItemsSource="{Binding PackageTypes}" SelectedItem="{Binding SelectedType}" />
<GroupBox /><!--Change content of this based on combobox's selection-->

public class MainViewModel : ViewModelBase
{
    private PackageModel_selectedPackageModel;
    public PackageModel SelectedPackageModel
    {
        get => _selectedPackageModel;
        set
        {
            _selectedPackageModel = value;
        }
    }

    public ObservableCollection<int> PackageTypes { get; set; }

    public int SelectedType { get; set; }

    public MainViewModel()
    {
        PackageTypes = new ObservableCollection<int>() { 1, 2, 3, 4 };
    }
}

最佳答案

您可以将Style与触发器配合使用,例如:

<ComboBox x:Name="cmb" xmlns:s="clr-namespace:System;assembly=mscorlib">
    <s:Int32>1</s:Int32>
    <s:Int32>2</s:Int32>
    <s:Int32>3</s:Int32>
    <s:Int32>4</s:Int32>
</ComboBox>

<GroupBox Header="...">
    <GroupBox.Style>
        <Style TargetType="GroupBox">
            <Style.Triggers>
                <DataTrigger Binding="{Binding SelectedItem, ElementName=cmb}" Value="1">
                    <Setter Property="Content">
                        <Setter.Value>
                            <TextBlock Text="1..." />
                        </Setter.Value>
                    </Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding SelectedItem, ElementName=cmb}" Value="2">
                    <Setter Property="Content">
                        <Setter.Value>
                            <Button Content="2..." />
                        </Setter.Value>
                    </Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </GroupBox.Style>
</GroupBox>

当然,可以绑定(bind)到 View 模型的source属性,而不是绑定(bind)到SelectedItemComboBox属性:
<DataTrigger Binding="{Binding SelectedType}" Value="1">

确保 View 模型实现了INotifyPropertyChanged接口(interface)并引发更改通知。

关于c# - 根据组合框选择更改GroupBox的内容,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/53726027/

10-12 12:45
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