'DependsOnTargets'和'AfterTargets'有什么区别?

问题描述

DependsOnTargets和AfterTargets有什么区别?我无法区分这两个.

What is the difference between DependsOnTargets and AfterTargets?I can not distinguish these two.

推荐答案

DependsOnTargets

定义必须先执行的目标.

<Target Name="DependsOn" DependsOnTargets="DependencyTarget1;DependencyTarget2">
  <Message Text="Target : DependsOn"/>
</Target>

<Target Name="DependencyTarget2">
  <Message Text="Target : DependencyTarget2"/>
</Target> 

<Target Name="DependencyTarget1">
  <Message Text="Target : DependencyTarget1"/>
</Target> 

Output
> Target : DependencyTarget1
> Target : DependencyTarget2
> Target : DependsOn

BeforeTargets和AfterTargets(仅在MSBuild 4中可用)

表明目标应在指定的一个或多个目标之前或之后运行.

<Target Name="BeforeAndAfter">
  <Message Text="Target : BeforeAndAfter"/>
</Target>

<!-- BeforeTarget1 will run BEFORE target "BeforeAndAfter" -->
<Target Name="BeforeTarget" BeforeTargets="BeforeAndAfter">
  <Message Text="BeforeTarget run before : BeforeAndAfter"/>
</Target> 

<!-- BeforeTarget1 will run AFTER target "BeforeAndAfter" -->
<Target Name="AfterTarget" AfterTargets="BeforeAndAfter">
  <Message Text="AfterTarget run after : BeforeAndAfter"/>
</Target> 

Output
> BeforeTarget run before : BeforeAndAfter
> Target : BeforeAndAfter
> AfterTarget run after : BeforeAndAfter

• 如果有多个目标应在相同的指定目标之前或之后运行，则将按声明顺序执行:

  <Target Name="BeforeAndAfter">
    <Message Text="Target : BeforeAndAfter"/>
  </Target>
  
  <!-- 
     BOTH BeforeTarget1 and BeforeTarget2 should run before target "BeforeAndAfter"
  -->
  <Target Name="BeforeTarget1" BeforeTargets="BeforeAndAfter">
    <Message Text="BeforeTarget1 run before : BeforeAndAfter"/>
  </Target> 
  
  <Target Name="BeforeTarget2" BeforeTargets="BeforeAndAfter">
    <Message Text="BeforeTarget2 run before : BeforeAndAfter"/>
  </Target> 
  

BeforeTargets和AfterTargets可用于扩展现有的构建过程.

例如，使用此属性，您可以在 CoreCompile (在Microsoft.CSharp.targets 中定义)之前轻松地执行目标.否则，您将不得不覆盖属性CoreCompileDependsOn.

For example, with this attributes you can easily execute a target before CoreCompile (defines in Microsoft.CSharp.targets). Without that you'll have to override the property CoreCompileDependsOn.

没有AfterTargets，如果没有定义扩展点(在目标末尾的CallTarget具有可以覆盖的属性)，您将无法轻松地执行另一个目标.

Without AfterTargets you have no way to easily execute a target after another one if no extension point is defined (CallTarget at the end of the target with a property that you can override)

在同一目标上使用DependsOnTargets，BeforeTargets和AfterTargets时，执行顺序为:

When DependsOnTargets, BeforeTargets and AfterTargets are used on the same target, the order of execution is :

• DependsOnTargets
• BeforeTargets
• 目标

• AfterTargets

• DependsOnTargets
• BeforeTargets
• The target

• AfterTargets

<Target Name="MainTarget" DependsOnTargets="DefaultDependsOn">
  <Message Text="Target : MainTarget"/>
</Target>

<Target Name="DefaultDependsOn">
  <Message Text="Target : DefaultDependsOn"/>
</Target>

<Target Name="DefaultBeforeTarget" BeforeTargets="MainTarget">
  <Message Text="Target : DefaultBeforeTarget"/>
</Target>

<Target Name="DefaultAfterTarget" AfterTargets="MainTarget">
  <Message Text="Target : DefaultAfterTarget"/>
</Target> 

Output
> Target : DefaultDependsOn
> Target : DefaultBeforeTarget
> Target : MainTarget
> Target : DefaultAfterTarget

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