.Net base software framework - pattern, configuration and tool

1. Page 21 Genric constraint

C# generic constraint is a way to specify requirements on the type parameter of a generic class or method. It allows you to restrict the types that can be used as the generic argument by imposing certain conditions on the type parameter.

There are several types of generic constraints in C#, including:

1. where T : class: This constraint specifies that the type parameter T must be a reference type, such as a class, interface, delegate, or array.

2. where T : struct: This constraint specifies that the type parameter T must be a value type, such as an int, float, bool, or a user-defined struct.

3. where T : new(): This constraint specifies that the type parameter T must have a public parameterless constructor.

4. where T : SomeBaseClass: This constraint specifies that the type parameter T must derive from or be the same as the class SomeBaseClass.

5. where T : ISomeInterface: This constraint specifies that the type parameter T must implement the interface ISomeInterface.

6. where T : unmanaged: This constraint specifies that the type parameter T must be an unmanaged type, such as a primitive type, a pointer, or a user-defined struct that contains only unmanaged types.

By using these constraints, you can write more generic and flexible code that is also safer and more efficient. For example, you can prevent null reference exceptions by requiring that the type parameter must be a reference type, or you can enable arithmetic operations by requiring that the type parameter must be a numeric type.

 

 

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