通过WPF中的MVVM模式更改按钮背景颜色 [英] Change Button Background color through MVVM pattern in WPF

问题描述

我正在将MVVM灯与WPF一起使用.我想通过ViewModel根据某些特定条件设置按钮背景色.请提出一些获取方法.谢谢

I am using MVVM light with WPF. I want to set button background color based on some specific condition through ViewModel. Kindly suggest some way to get it. Thanks

推荐答案

使用触发器:

<Button>
    <Button.Style>
        <Style TargetType="Button">
            <!-- Set the default value here (if any) 
                 if you set it directly on the button that will override the trigger -->
            <Setter Property="Background" Value="LightGreen" />
            <Style.Triggers>
                <DataTrigger Binding="{Binding SomeConditionalProperty}"
                             Value="True">
                    <Setter Property="Background" Value="Pink" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

[关于注释]

在MVVM中，您通常还可以通过仅获取属性(例如

In MVVM you can also often handle this in the view-model via get-only properties as well, e.g.

public bool SomeConditionalProperty 
{
    get { /*...*/ }
    set
    {
        //...

        OnPropertyChanged(nameof(SomeConditionalProperty));
        //Because Background is dependent on this property.
        OnPropertyChanged(nameof(Background));
    }
}

public Brush Background =>
    SomeConditinalProperty ? Brushes.Pink : Brushes.LightGreen;

然后您只需绑定到Background.

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