blocks|key|340929|text|你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|340930|DesignerProperties.GetIsInDesignMode(new+DependencyObject());|code-block|syntax|javascript|340931|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can do something like this:

<pre><code>DesignerProperties.GetIsInDesignMode(new DependencyObject());
</code></pre>

blocks|key|3114349|text|我相信你要找的是需要DependencyObject的GetIsInDesignMode。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3114350|即。|3114351|//+'this'+is+your+UI+element
DesignerProperties.GetIsInDesignMode(this);|code-block|syntax|javascript|3114352|编辑：使用Silverlight+/+WP7时，您应该使用IsInDesignTool，因为在Visual+Studio中，GetIsInDesignMode有时会返回false：|style|BOLD|CODE|3114353|DesignerProperties.IsInDesignTool|3114354|编辑：，最后，为了完整起见，WinRT+/+Metro+/+Windows+Store应用程序中的等价物是DesignModeEnabled|3114355|Windows.ApplicationModel.DesignMode.DesignModeEnabled|3114356|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.componentmodel.designerproperties.getisindesignmode.aspx|1|http://msdn.microsoft.com/en-us/library/system.componentmodel.designerproperties.isindesigntool%2528v=VS.95%2529.aspx|2|http://msdn.microsoft.com/en-us/library/windows/apps/windows.applicationmodel.designmode.designmodeenabled.aspx^0|R|H|0|0|0|0|0|3|T|E|1Q|H|T|E|1|0|0|0|3|1H|H|1H|H|2|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|D|3|E|5|6|7|1B|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1C|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1D|8|@$A|1E|B|1F|M|N]|$A|1G|B|1H|M|O]|$A|1I|B|1J|M|O]]|9|@$A|1K|B|1L|1|1M]]|C|$]]|$1|P|3|Q|5|H|7|1N|8|@]|9|@]|C|$I|J]]|$1|R|3|S|5|6|7|1O|8|@$A|1P|B|1Q|M|N]|$A|1R|B|1S|M|O]]|9|@$A|1T|B|1U|1|1V]]|C|$]]|$1|T|3|U|5|H|7|1W|8|@]|9|@]|C|$I|J]]|$1|V|3|-4|5|6|7|1X|8|@]|9|@]|C|$]]]|W|$X|$5|Y|Z|10|C|$11|12]]|13|$5|Y|Z|10|C|$11|14]]|15|$5|Y|Z|10|C|$11|16]]]]

I believe you are looking for <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.designerproperties.getisindesignmode.aspx" rel="noreferrer">GetIsInDesignMode</a>, which takes a DependencyObject.

Ie.

<pre><code>// 'this' is your UI element
DesignerProperties.GetIsInDesignMode(this);
</code></pre>

Edit: When using Silverlight / WP7, you should use <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.designerproperties.isindesigntool%28v=VS.95%29.aspx" rel="noreferrer"><code>IsInDesignTool</code></a> since <code>GetIsInDesignMode</code> can sometimes return false while in Visual Studio:

<pre><code>DesignerProperties.IsInDesignTool
</code></pre>

Edit: And finally, in the interest of completeness, the equivalent in WinRT / Metro / Windows Store applications is <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.applicationmodel.designmode.designmodeenabled.aspx" rel="noreferrer"><code>DesignModeEnabled</code></a>:

<pre><code>Windows.ApplicationModel.DesignMode.DesignModeEnabled
</code></pre>

blocks|key|3327172|text|当Visual+Studio自动为我生成一些代码时，它使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3327173|if+(!System.ComponentModel.DesignerProperties.GetIsInDesignMode(this))+
{
++++...
}|code-block|syntax|javascript|3327174|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When Visual Studio auto generated some code for me it used 

<pre><code>if (!System.ComponentModel.DesignerProperties.GetIsInDesignMode(this)) 
{
 ...
}
</code></pre>

blocks|key|340950|text|如果你在你的大型WPF+/+Silverlight+/+WP8+/+WinRT应用程序中广泛使用Caliburn.Micro，你也可以在你的视图模型中使用handy和的通用caliburn的Execute.InDesignMode静态属性(它在Blend中的效果和在Visual+Studio中一样好)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|340951|using+Caliburn.Micro;

//+...

///+<summary>
///+Default+view-model's+ctor+without+parameters.
///+</summary>
public+SomeViewModel()
{
++++if(Execute.InDesignMode)
++++{
++++++++//Add+fake+data+for+design-time+only+here:

++++++++//SomeStringItems+=+new+List<string>
++++++++//{
++++++++//++"Item+1",
++++++++//++"Item+2",
++++++++//++"Item+3"
++++++++//};
++++}
}|code-block|syntax|javascript|340952|entityMap|0|LINK|mutability|MUTABLE|url|http://caliburnmicro.codeplex.com/^0|8|V|2B|3|2N|K|1C|E|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|D]]|E|@$9|10|A|11|1|12]]|F|$]]|$1|G|3|H|5|I|7|13|8|@]|E|@]|F|$J|K]]|$1|L|3|-4|5|6|7|14|8|@]|E|@]|F|$]]]|M|$N|$5|O|P|Q|F|$R|S]]]]

And if you extensively use <a href="http://caliburnmicro.codeplex.com" rel="noreferrer">Caliburn.Micro</a> for your large WPF / Silverlight / WP8 / WinRT application you could use handy and universal caliburn's <code>Execute.InDesignMode</code> static property in your view-models as well (and it works in Blend as good as in Visual Studio):

<pre><code>using Caliburn.Micro;

// ...

/// &lt;summary&gt;
/// Default view-model's ctor without parameters.
/// &lt;/summary&gt;
public SomeViewModel()
{
 if(Execute.InDesignMode)
 {
 //Add fake data for design-time only here:

 //SomeStringItems = new List&lt;string&gt;
 //{
 // "Item 1",
 // "Item 2",
 // "Item 3"
 //};
 }
}
</code></pre>

blocks|key|340954|text|public+static+bool+InDesignMode()
{
++++return+!(Application.Current+is+App);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|340955|随时随地都能工作。我使用它来阻止数据绑定视频在设计器中播放。|unstyled|340956|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>public static bool InDesignMode()
{
 return !(Application.Current is App);
}
</code></pre>

Works from anywhere. I use it to stop databound videos from playing in the designer.

blocks|key|340962|text|在WPF中还有其他(可能更新的)指定设计时数据的方法，如mentioned+in+this+related+answer。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|340963|本质上，您可以使用design-time+instance+of+your+ViewModel指定设计时数据|340964|d:DataContext="{d:DesignInstance+Type=v:MySampleData,+IsDesignTimeCreatable=True}"|code-block|syntax|javascript|340965|或由specifying+sample+data+in+a+XAML+file提供|340966|d:DataContext="{d:DesignData+Source=../DesignData/SamplePage.xaml}">|340967|您必须将SamplePage.xaml文件属性设置为：|style|CODE|340968|BuildAction:+++++++++++++++DesignData
Copy+to+Output+Directory:++Do+not+copy
Custom+Tool:+++++++++++++++[DELETE+ANYTHING+HERE+SO+THE+FIELD+IS+EMPTY]|340969|我将这些代码放在我的UserControl标记中，如下所示：|340970|<UserControl
++++...
++++xmlns:d="http://schemas.microsoft.com/expression/blend/2008"+

++++xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
++++...
++++d:DesignWidth="640"+d:DesignHeight="480"
++++d:DataContext="...">|340971|在运行时，所有的"d:“设计时标记都会消失，因此无论您选择如何设置，都只能获得运行时数据上下文。|340972|编辑您可能还需要这些行(我不确定，但它们似乎是相关的)：|BOLD|340973|xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"+
mc:Ignorable="d"+|340974|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/6697006/1174169|1|http://msdn.microsoft.com/en-us/library/dd490796(VS.100).aspx)|2|http://msdn.microsoft.com/en-us/library/ee823176(v=vs.100).aspx)^0|S|W|0|0|9|12|1|0|0|2|11|2|0|0|4|F|0|0|A|B|0|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]]|C|$]]|$1|D|3|E|5|6|7|1L|8|@]|9|@$A|1M|B|1N|1|1O]]|C|$]]|$1|F|3|G|5|H|7|1P|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1Q|8|@]|9|@$A|1R|B|1S|1|1T]]|C|$]]|$1|M|3|N|5|H|7|1U|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1V|8|@$A|1W|B|1X|Q|R]]|9|@]|C|$]]|$1|S|3|T|5|H|7|1Y|8|@]|9|@]|C|$I|J]]|$1|U|3|V|5|6|7|1Z|8|@$A|20|B|21|Q|R]]|9|@]|C|$]]|$1|W|3|X|5|H|7|22|8|@]|9|@]|C|$I|J]]|$1|Y|3|Z|5|6|7|23|8|@]|9|@]|C|$]]|$1|10|3|11|5|6|7|24|8|@$A|25|B|26|Q|12]]|9|@]|C|$]]|$1|13|3|14|5|H|7|27|8|@]|9|@]|C|$I|J]]|$1|15|3|-4|5|6|7|28|8|@]|9|@]|C|$]]]|16|$17|$5|18|19|1A|C|$1B|1C]]|1D|$5|18|19|1A|C|$1B|1E]]|1F|$5|18|19|1A|C|$1B|1G]]]]

There are other (maybe newer) ways of specifying design-time data in WPF, as <a href="https://stackoverflow.com/a/6697006/1174169">mentioned in this related answer</a>. 

Essentially, you can specify design-time data using a <a href="http://msdn.microsoft.com/en-us/library/dd490796(VS.100).aspx" rel="noreferrer">design-time instance of your ViewModel</a>:

<pre><code>d:DataContext="{d:DesignInstance Type=v:MySampleData, IsDesignTimeCreatable=True}"
</code></pre>

or by <a href="http://msdn.microsoft.com/en-us/library/ee823176(v=vs.100).aspx" rel="noreferrer">specifying sample data in a XAML file</a>:

<pre><code>d:DataContext="{d:DesignData Source=../DesignData/SamplePage.xaml}"&gt;
</code></pre>

You have to set the <code>SamplePage.xaml</code> file properties to: 

<pre><code>BuildAction: DesignData
Copy to Output Directory: Do not copy
Custom Tool: [DELETE ANYTHING HERE SO THE FIELD IS EMPTY]
</code></pre>

I place these in my <code>UserControl</code> tag, like this:

<pre><code>&lt;UserControl
 ...
 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 ...
 d:DesignWidth="640" d:DesignHeight="480"
 d:DataContext="..."&gt;
</code></pre>

At run-time, all of the "d:" design-time tags disappear, so you'll only get your run-time data context, however you choose to set it.

Edit
You may also need these lines (I'm not certain, but they seem relevant):

<pre><code>xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
mc:Ignorable="d" 
</code></pre>

blocks|key|342368|text|我只用Visual+Studio2013和.NET+4.5测试过这一点，但它做到了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|342369|public+static+bool+IsDesignerContext()
{
++var+maybeExpressionUseLayoutRounding+=
++++Application.Current.Resources["ExpressionUseLayoutRounding"]+as+bool?;
++return+maybeExpressionUseLayoutRounding+??+false;
}|code-block|syntax|javascript|342370|虽然Visual+Studio中的某些设置可能会将此值更改为false，但如果发生这种情况，我们可能只会检查此资源名称是否存在。当我在设计器之外运行我的代码时，它是null。|offset|length|style|CODE|342371|这种方法的优点是它不需要明确了解特定的App类，并且可以在整个代码中全局使用它。特别是用虚拟数据填充视图模型。|342372|entityMap^0|0|0|2A|4|0|J|3|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@$I|W|J|X|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

I've only tested this with Visual Studio 2013 and .NET 4.5 but it does the trick.

<pre><code>public static bool IsDesignerContext()
{
 var maybeExpressionUseLayoutRounding =
 Application.Current.Resources["ExpressionUseLayoutRounding"] as bool?;
 return maybeExpressionUseLayoutRounding ?? false;
}
</code></pre>

It's possible though that some setting in Visual Studio will change this value to false, if that ever happens we can result to just checking whether this resource name exist. It was <code>null</code> when I ran my code outside the designer.

The upside of this approach is that it does not require explicit knowledge of the specific <code>App</code> class and that it can be used globally throughout your code. Specifically to populate view models with dummy data.

blocks|key|3114537|text|如果你的类不需要空的构造器，我有一个建议。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3114538|这个想法是创建一个空的构造函数，然后用ObsoleteAttribute标记它。设计器会忽略obsolete属性，但如果您尝试使用它，编译器将会引发错误，因此您自己不会有意外使用它的风险。|3114539|(pardon+my+visual+basic)|offset|length|3114540|Public+Class+SomeClass

++++<Obsolete("Constructor+intended+for+design+mode+only",+True)>
++++Public+Sub+New()
++++++++DesignMode+=+True
++++++++If+DesignMode+Then
++++++++++++Name+=+"Paula+is+Brillant"
++++++++End+If
++++End+Sub

++++Public+Property+DesignMode+As+Boolean
++++Public+Property+Name+As+String+=+"FileNotFound"
End+Class|code-block|syntax|javascript|3114541|和xaml：|3114542|<UserControl+x:Class="TestDesignMode"
+++++++++++++xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+++++++++++++xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+++++++++++++xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"+
+++++++++++++xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+++++++++++++xmlns:vm="clr-namespace:AssemblyWithViewModels;assembly=AssemblyWithViewModels"
+++++++++++++mc:Ignorable="d"+
+++++++++++++>
++<UserControl.Resources>
++++<vm:SomeClass+x:Key="myDataContext"+/>
++</UserControl.Resources>
++<StackPanel>
++++<TextBlock+d:DataContext="{StaticResource+myDataContext}"+Text="{Binding+DesignMode}"+Margin="20"/>
++++<TextBlock+d:DataContext="{StaticResource+myDataContext}"+Text="{Binding+Name}"+Margin="20"/>
++</StackPanel>
</UserControl>|3114543|​|3114544|📷|atomic|3114545|3114546|如果你真的需要空的构造器来做别的事情，那么这个方法就不会起作用。|3114547|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Pardon_my_French|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a1644b701f645693039d4bacbccbed1d.png|imageAlt^0|0|0|1|M|0|0|0|0|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1E|8|@]|9|@$F|1F|G|1G|1|1H]]|A|$]]|$1|H|3|I|5|J|7|1I|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1J|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|1K|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1L|8|@]|9|@]|A|$]]|$1|S|3|T|5|U|7|1M|8|@]|9|@$F|1N|G|1O|1|1P]]|A|$]]|$1|V|3|R|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]|16|$5|17|12|18|A|$19|1A|1B|-4]]]]

I have an idea for you if your class doesn't need an empty constructor.

The idea is to create an empty constructor, then mark it with ObsoleteAttribute. The designer ignores the obsolete attribute, but the compiler will raise an error if you try to use it, so there's no risk of accidentaly using it yourself.

(<a href="https://en.wikipedia.org/wiki/Pardon_my_French" rel="nofollow noreferrer">pardon my visual basic</a>)

<pre><code>Public Class SomeClass

 &lt;Obsolete("Constructor intended for design mode only", True)&gt;
 Public Sub New()
 DesignMode = True
 If DesignMode Then
 Name = "Paula is Brillant"
 End If
 End Sub

 Public Property DesignMode As Boolean
 Public Property Name As String = "FileNotFound"
End Class
</code></pre>

And the xaml:

<pre><code>&lt;UserControl x:Class="TestDesignMode"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 xmlns:vm="clr-namespace:AssemblyWithViewModels;assembly=AssemblyWithViewModels"
 mc:Ignorable="d" 
 &gt;
 &lt;UserControl.Resources&gt;
 &lt;vm:SomeClass x:Key="myDataContext" /&gt;
 &lt;/UserControl.Resources&gt;
 &lt;StackPanel&gt;
 &lt;TextBlock d:DataContext="{StaticResource myDataContext}" Text="{Binding DesignMode}" Margin="20"/&gt;
 &lt;TextBlock d:DataContext="{StaticResource myDataContext}" Text="{Binding Name}" Margin="20"/&gt;
 &lt;/StackPanel&gt;
&lt;/UserControl&gt;
</code></pre>

<a href="https://i.stack.imgur.com/dLAyn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dLAyn.png" alt="result of the above code"></a>

This won't work if you really need the empty constructor for something else.

blocks|key|3327351|text|接受的答案对我不起作用(VS2019)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3327352|在检查了发生了什么之后，我想出了这个：|3327353|++++public+static+bool+IsRunningInVisualStudioDesigner
++++{
++++++++get
++++++++{
++++++++++++//+Are+we+looking+at+this+dialog+in+the+Visual+Studio+Designer+or+Blend?
++++++++++++string+appname+=+System.Reflection.Assembly.GetEntryAssembly().FullName;
++++++++++++return+appname.Contains("XDesProc");
++++++++}
++++}|code-block|syntax|javascript|3327354|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Accepted answer didn't work for me (VS2019).

After inspecting what was going on, I came up with this:

<pre><code> public static bool IsRunningInVisualStudioDesigner
 {
 get
 {
 // Are we looking at this dialog in the Visual Studio Designer or Blend?
 string appname = System.Reflection.Assembly.GetEntryAssembly().FullName;
 return appname.Contains("XDesProc");
 }
 }
</code></pre>

Does anyone know of some global state variable that is available so that I can check if the code is currently executing in design mode (e.g. in Blend or Visual Studio) or not? 

It would look something like this:

<pre><code>//pseudo code:
if (Application.Current.ExecutingStatus == ExecutingStatus.DesignMode) 
{
 ...
}
</code></pre>

The reason I need this is: when my application is being shown in design mode in Expression Blend, I want the ViewModel to instead use a "Design Customer class" which has mock data in it that the designer can view in design mode.

However, when the application is actually executing, I of course want the ViewModel to use the real Customer class which returns real data.

Currently I solve this by having the designer, before he works on it, go into the ViewModel and change "ApplicationDevelopmentMode.Executing" to "ApplicationDevelopmentMode.Designing":

<pre><code>public CustomersViewModel()
{
 _currentApplicationDevelopmentMode = ApplicationDevelopmentMode.Designing;
}

public ObservableCollection&lt;Customer&gt; GetAll
{
 get
 {
 try
 {
 if (_currentApplicationDevelopmentMode == ApplicationDevelopmentMode.Developing)
 {
 return Customer.GetAll;
 }
 else
 {
 return CustomerDesign.GetAll;
 }
 }
 catch (Exception ex)
 {
 throw new Exception(ex.Message);
 }
 }
}
</code></pre>

Is there a way to check if WPF is currently executing in design mode or not?

Visual Studio

编译器

Windows

有没有人知道一些全局状态变量，这样我就可以检查代码当前是否在设计模式下执行(例如在Blend或Visual Studio中)？它看起来像这样：//pseudo code:if (Application.Current.ExecutingStatus == ExecutingStatus.DesignMode) {   ...

问有没有办法检查WPF当前是否在设计模式下执行？
EN

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问有没有办法检查WPF当前是否在设计模式下执行？
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