How Can I Restrict Generic Method Arguments to Numeric Types in C#?

C#generic method Numerical type limit

The generic method in C#is a powerful tool for abstract and complex operations across different types. However, traditional keywords only allow interfaces or inheritance constraints. This limit may become a problem when you want to limit the parameter to a specific type (such as numerical base element type).

.NET 7 introduced ibinaryInteger where

With the emergence of .NET 7, a solution to this problem appeared: System.numerics named interface in the name space. This interface contains all integer types that allow you to restrain the generic method as int16, int32, int64, UINT16, UINT32, and UINT64.

Using IBINARYINTEGER

Implementing IntegerFunction IBinaryInteger<Tself>

For example, considering the following , if the parameter passed is positive, return True.

Example usage

IntegerFunction

Using the new , we can easily check the positive and negative nature of different integer types:

<code class="language-csharp">static bool IntegerFunction<T>(T value) where T : IBinaryInteger<T>
{
    return value > T.Zero;
}</code>

History review

Before the introduction of , C#lacks explicit support to limit the genetic parameters as a specific numerical type. Instead, programmers can help change methods, such as factory models or strategy. However, these methods require users to write additional code and increase complexity. IntegerFunction

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