如何在 WPF 设计模式下为绑定属性设置要显示的值? [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 empty
字符串.我想为这些内容显示一些伪造的值,但我不知道该怎么做.
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.
如果你知道怎么做,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一种简单方法是使用设计数据上下文.带有 Window 和 ViewModel 的简短示例,对于 DataContext,d:DataContext 将在设计模式下使用,而 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,我将为两者使用相同的 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,我们检查是否处于设计模式,在这种情况下,我们返回其他内容.
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,位于此处,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;
}
}
这篇关于如何在 WPF 设计模式下为绑定属性设置要显示的值?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!