How to Use Preprocessor Directives in Razor Views?

Razor's Take on Preprocessor Directives

When working with Razor pages for the first time, developers may encounter the need to utilize preprocessor directives like #if debug. However, the straightforward syntax of preprocessor directives in C# is not directly applicable in Razor.

An Alternative Approach

To achieve similar functionality in Razor, developers can leverage an extension method. The following example demonstrates how to create an IsDebug extension method that can be used to conditionally render content in Razor views:

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

This method checks the DEBUG symbol, which is defined during compilation. By incorporating this method into Razor views, developers can conditionally display or hide content based on the compilation configuration. For instance:

<section>

Since this helper method is compiled with the DEBUG/RELEASE symbol, it effectively mimics the behavior of preprocessor directives in Razor. This offers a flexible solution for conditionally rendering content in Razor views based on the compilation configuration.

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