How to Use Preprocessor Directives in Razor?

Preprocessor Directives in Razor

When writing a Razor page, you may encounter the need to configure it based on the compilation configuration (such as debugging or release) conditionally executes code. This article explains how to use preprocessor directives like #if/#else in Razor to achieve this.

Question: How to use preprocessor directives in Razor?

Answer:

Although Razor syntax does not support the direct use of #if/#else preprocessor directives, it can be achieved indirectly through custom extension methods Similar functionality.

Solution:

1. Create a custom HtmlHelper extension method like this:

public static bool IsDebug(this HtmlHelper htmlHelper)
{
#if DEBUG
      return true;
#else
      return false;
#endif
}

2. Use extension methods in conditional statements in views Check the compilation configuration in as follows:

<section>

This extension method relies on the DEBUG/RELEASE symbols in the compiler and will return true in debug mode and false in release mode . Therefore, it allows you to conditionally render elements in the view based on the compilation configuration.

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