如何有条件地引用基于一个编译符号一个DLL？ [英] How to conditionally reference a DLL based on a compilation symbol?

问题描述

的Visual Studio 2013

Visual Studio 2013.

我有我在的csproj文件中引用这样的外部DLL：

I have an external DLL which I am referencing like this in the csproj file:

  <ItemGroup>
    <Reference Include="NameOfDll">
      <HintPath>Path\To\Dll\NameOfDll.dll</HintPath>
    </Reference>

我想这个引用时，编译器符号存在，并且当编译器符号还不到无法正常运作存在。 （为了解决第一个评论，下面，让我们说的编译器符号叫做弗雷德）

I want this reference to function when a compiler symbol exists and to not function when that compiler symbol does not exist. (To address the first comment, below, let's say the compiler symbol is called Fred.)

这问题
[的Conditional参考]
让我觉得我可以称为条件的属性添加到上面显示的参考元素，但我不知道是什么值给该属性来实现我想要的东西。

This question [ Conditional Reference ] made me think I could add an attribute called Condition to the Reference element shown above but I can't work out what value to give that attribute to effect what I want.

我会很乐意给予的方式在VS UI要做到这一点，但我会采取任何方法。

I'd be most happy to be given a way to do this in the VS UI but I'll take any method.

推荐答案

的条件编译符号在 DefineConstants MSBuild的属性。检查这个包含您的符号：

The conditional compilation symbols are in the DefineConstants MSBuild property. Check that this contains your symbol:

<Reference Include="NameOfDll" Condition="$(DefineConstants.Contains('Fred'))">
  <HintPath>Path\To\Dll\NameOfDll.dll</HintPath>
</Reference>

选择的符号与众不同的名字。不是东西，也能像调试或跟踪另一个常量的子串。

Pick a distinctive name for the symbol. Not something that could be a substring of another constant like Debug or Trace.

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