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This article introduces the relevant knowledge of "detailed explanation of citations in C# generic constraints". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Reference / value type constraints in C # generic constraints use C # generics, and the compiler compiles generic code to IL, regardless of the type arguments that the client will use. Therefore, generic code can try to use methods, properties, or members of generic type parameters that are not compatible with specific types of arguments used by the client. This is unacceptable because it amounts to a lack of type safety. In C #, you need to tell the compiler client which constraints the specified types must follow so that they can be used instead of generic type parameters. There are three types of constraints. Derived constraints instruct the compiler that general type parameters are derived from base types such as interfaces or specific base classes. The default constructor constraint instructs the compiler general type parameters to expose the default public constructor (public constructor with no arguments).

The reference / value type constraint of a C # generic constraint constrains a general type parameter to a reference type or value type. Generic types can take advantage of multiple constraints, and you can even have IntelliSense reflect these constraints when using generic type parameters, for example, suggesting methods or members in a base type.

Understanding and application of reference / value type constraints for C # generic constraints:

You can use struct constraints to constrain generic type parameters to value types (for example, int, bool, and enum), or any custom structure:

Public class MyClass where T: struct {...}

Similarly, you can use class constraints to constrain generic type parameters to reference types (classes):

Public class MyClass where T: class {...}

Reference / value type constraints cannot be used with base class constraints because base class constraints involve classes. Similarly, structure and default reference / value type constraints cannot be used, because the default reference / value type constraints also involve classes. Although you can use class and default reference / value type constraints, this is of no value. You can combine a reference / value type constraint with an interface constraint, provided that the reference / value type constraint appears at the beginning of the list of constraints.

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