visual-studio 我如何在 C# 视觉工作室中定义预处理器符号
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How do i define a preprocessor symbols in C# visual studios
提问by Russell
Sorry if my terminology is wrong. I wrote #if TEST_APPin my code. Now i would like to define TEST_APP. How do i set it using visual studios 2010? This is a windows form application.
对不起，如果我的术语是错误的。我写#if TEST_APP在我的代码中。现在我想定义 TEST_APP。我如何使用 Visual Studios 2010 设置它？这是一个 windows 窗体应用程序。
Bonus if you can tell me the name of the symbol that is set in a winform project and in a web project
如果你能告诉我在 winform 项目和 web 项目中设置的符号的名称，则奖励
回答by Russell
In visual studio solution explorer, right click on a project and click Properties. Open the build tab and you will see a field "Conditional compilation symbols". This is a comma separated list, or space separated. There are also 2 checkboxes for commonly used symbols, DEBUG and TRACE.
在 Visual Studio 解决方案资源管理器中，右键单击一个项目，然后单击“属性”。打开构建选项卡，您将看到一个字段“条件编译符号”。这是一个逗号分隔的列表，或空格分隔。还有 2 个用于常用符号的复选框，DEBUG 和 TRACE。
For your web projects you could set the field to "WEB_PROJECT" and winforms to "WINFORMS_PROJECT"
对于您的网络项目，您可以将该字段设置为“WEB_PROJECT”并将 winforms 设置为“WINFORMS_PROJECT”
回答by Jon Skeet
In the Build tab of the properties page for the project, look for the "Conditional compilation symbols" setting.
在项目属性页面的构建选项卡中，查找“条件编译符号”设置。
I don't believe there are any different symbols defined by default for web and winform applications. Bear in mind this is set for the project itself, and won't affect any class libraries - so I'd expect any code within a project to really know whether it's in a Windows application or not to start with. What were you thinking of using this for?
我不相信默认情况下为 web 和 winform 应用程序定义了任何不同的符号。请记住，这是为项目本身设置的，不会影响任何类库 - 所以我希望项目中的任何代码真正知道它是否在 Windows 应用程序中。你想用这个做什么？
回答by Michal Ciechan
回答by Glenn Slayden
If you need your conditional compilation to dynamically reflect the build or environment conditions, check my answer to How do I set a conditional compile variableon StackOverflow. I show how to enable conditional compilation based on ambient conditions, such as C# language version, so that you can write code like this:
如果您需要条件编译来动态反映构建或环境条件，请查看我对如何在 StackOverflow 上设置条件编译变量的回答。我展示了如何根据环境条件启用条件编译，例如C# 语言版本，以便您可以编写如下代码：
#if CSHARP7
ref T pi = ref rg[i], pj = ref rg[j];
var t = pi; // swap elements: managed pointers
pi = pj;
pj = t;
#else
var t = rg[i]; // swap elements: clunky
rg[i] = rg[j];
rg[j] = t;
#endif
