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How to use #error and #warning directives in C#?
#error directive
The #error directive allows generating an error from a specific location in your code.
Let us see an example −
Example
using System;
namespace Demo {
class Program {
public static void Main(string[] args) {
#if (!ONE)
#error ONE is undefined
#endif
Console.WriteLine("Generating a user-defined error!");
}
}
}After running the above program, a user-defined error generates −
Output
Compilation failed: 1 error(s), 0 warnings error CS1029: #error: 'ONE is undefined'
#warning directive
The #warning directive allows generating a level one warning from a specific location in your code.
Let us see an example −
Example
using System;
namespace Demo {
class Program {
public static void Main(string[] args) {
#if (!TWO)
#warning TWO is undefined
#endif
Console.WriteLine("Generates a warning!");
}
}
}After running the above program, warning generates and the output is visible −
Output
warning CS1030: #warning: `TWO is undefined' Generates a warning!
Updated on: 20-Jun-2020
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