如何使用存储在属性中的条件设置“条件"? [英] How to set 'condition' using a condition stored in a property?

问题描述

我有一个条件'a == 1'存储在$(c)属性中，我想将其用作任务消息的条件，如以下代码所示:

I have a condition such as 'a==1' stored in property $(c) and I wanna used it as the condition for task Message like below code:

  <PropertyGroup>
    <aa>1>2</aa>
  </PropertyGroup>

  <Target Name="t">
    <Message Text="122333" Condition="$(aa)" />
  </Target>

引发错误！ 那么，我该怎么办呢?请帮忙！

Error was raised! So, how can I do it? Please help!

推荐答案

您可以轻松地使用属性值来评估条件.这是一个示例:

You can easily use property values for evaluating conditions. Here is an example:

<PropertyGroup>
    <aa>1</aa>
</PropertyGroup>

<Target Name="Build">
    <Message Text="Some text" Condition=" $(aa) &lt; 2 " />
</Target>

请注意:

• 属性值是字符串，您必须在Condition属性中评估条件.有关评估条件的信息，请参见 MSDN文档.
• 您必须转义XML字符(将<替换为<)

• Property values are strings, you must evaluate the condition in the Condition attribute. See MSDN Docs on evaluating conditions.
• You must escape XML characters (replace < with < )

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