在WPF设计模式中如何设置显示绑定属性的值? [英] How to set a value to display for bound properties in WPF design mode?
问题描述
我的绑定内容在UI设计模式中显示为空
字符串。我想为这些内容显示一些假的价值,但我不知道如何。
My bound contents are showed as empty
string in the UI design-mode. I want to display some faked value for those contents but I don't know how to.
如果您知道如何,请分享。谢谢!
Please share if you know how to. Thank you!
推荐答案
在Visual Studio 2010中获取设计时数据的简单方法是使用设计数据文本。 Window和ViewModel的简单示例,对于DataContext,d:DataContext将在Design-mode中使用,StaticResource将在运行时使用。您也可以使用单独的ViewModel进行设计,但在本示例中,我将使用相同的ViewModel。
An easy way to get Design-time-data in Visual Studio 2010 is to use a design-datacontext. Short example with a Window and a ViewModel, For DataContext, the d:DataContext will be used in Design-mode and the StaticResource will be used in runtime. You can also use a separate ViewModel for design but in this example I will use the same ViewModel for both.
<Window ...
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:DesignTimeData"
mc:Ignorable="d"
d:DataContext="{d:DesignInstance local:MyViewModel,
IsDesignTimeCreatable=True}">
<Window.Resources>
<local:MyViewModel x:Key="MyViewModel" />
</Window.Resources>
<Window.DataContext>
<StaticResource ResourceKey="MyViewModel"/>
</Window.DataContext>
<StackPanel>
<TextBox Text="{Binding MyText}"
Width="75"
Height="25"
Margin="6"/>
</StackPanel>
</Window>
在ViewModels属性MyText中,我们检查我们是否处于设计模式,在这种情况下我们返回
And in the ViewModels property MyText we check if we're in design mode and in that case we return something else.
public class MyViewModel : INotifyPropertyChanged
{
public MyViewModel()
{
MyText = "Runtime-Text";
}
private string m_myText;
public string MyText
{
get
{
// Or you can use
// DesignerProperties.GetIsInDesignMode(this)
if (Designer.IsDesignMode)
{
return "Design-Text";
}
return m_myText;
}
set
{
m_myText = value;
OnPropertyChanged("MyText");
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Designer.cs,发现这里,看起来像这样
Designer.cs, which is found here, looks like this
public static class Designer
{
private static readonly bool isDesignMode;
public static bool IsDesignMode
{
get { return isDesignMode; }
}
static Designer()
{
DependencyProperty prop =
DesignerProperties.IsInDesignModeProperty;
isDesignMode =
(bool)DependencyPropertyDescriptor.
FromProperty(prop, typeof(FrameworkElement))
.Metadata.DefaultValue;
}
}
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