将多个元素值绑定到视图模型中的单个属性

本文关键字：模型 单个 属性 视图 元素 绑定 | 更新日期: 2023-09-27 18:03:40

如何将多个控件值绑定到视图模型中的单个属性

NOT VALID CODE: 

        <MultiBinding Converter="{StaticResource myMultiConverter}">
            <!--Convert From these element-->
            <From ElementName="check1" Path="IsChecked" />
            <From ElementName="check2" Path="IsChecked" />
            <From ElementName="check3" Path="IsChecked" />
            <From ElementName="check4" Path="IsChecked" />
            <!--To Viewmodel Property-->
            <To ElementName="myViewModelProperty" />
        </MultiBinding>
        <CheckBox Name="check1"></CheckBox>
        <CheckBox Name="check2"></CheckBox>
        <CheckBox Name="check3"></CheckBox>
        <CheckBox Name="check4"></CheckBox>

将多个元素值绑定到视图模型中的单个属性

按惯例绑定属性

<CheckBox Name="check1" IsChecked="{Binding Path=myViewModelProperty}" />
<CheckBox Name="check2" IsChecked="{Binding Path=myViewModelProperty}" />
<CheckBox Name="check3" IsChecked="{Binding Path=myViewModelProperty}" />
<CheckBox Name="check4" IsChecked="{Binding Path=myViewModelProperty}" />
然后，在ViewModel中: 
    public Boolean myViewModelProperty
    {
        get {  ...       }
        set {  ...       }
    }

同样在ViewModel中，当需要时:

this.RaisePropertyChanged<Boolean>(() => this.myViewModelProperty);

如果你想，你可以在一个属性上绑定尽可能多的元素值(即使我不理解4个具有相同属性的复选框^^)

MultiBinding用于将一个元素值绑定到多个ViewModel属性。

Edit:考虑到4复选框必须转换为enum:

<CheckBox Name="check1" IsChecked="{Binding Path=myViewModelProperty1}" />
<CheckBox Name="check2" IsChecked="{Binding Path=myViewModelProperty2}" />
<CheckBox Name="check3" IsChecked="{Binding Path=myViewModelProperty3}" />
<CheckBox Name="check4" IsChecked="{Binding Path=myViewModelProperty4}" />

    public Boolean myViewModelProperty1
    {
        get 
        { 
            return this.b1;  
        }
        set 
        { 
            this.b1  =value;
            this.EvaluateMyEnum();
        }
    }
    public Boolean myViewModelProperty2
    {
        get 
        { 
            return this.b2;  
        }
        set 
        { 
            this.b2  =value;
            this.EvaluateMyEnum();
        }
    }
    public Boolean myViewModelProperty3
    {
        get 
        { 
            return this.b2;  
        }
        set 
        { 
            this.b2  =value;
            this.EvaluateMyEnum();
        }
    }
    public Boolean myViewModelProperty4
    {
        get 
        { 
            return this.b4;  
        }
        set 
        { 
            this.b4  =value;
            this.EvaluateMyEnum();
        }
    }
    void EvaluateMyEnum()
    {
        this.MyViewModelEnum = ......;
        this.RaisePropertyChanged<MyEnum>(() => this.myViewModelEnum);
    }
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