Can Extension Methods Be Added to Static Classes in C#?

Can the extension method to the static class in the static class?

The expansion method in C# is a powerful feature that allows adding a new method to the existing type without having to modify its source code. However, the question is whether it can expand such a static class like .

Try to use the local static method of the "This" parameter to expand Console and add a

method. However, this method failed to add the required method.

Console The reason for this failure is the inherent characteristics of the expansion method. They need instance variables (values) of objects to play a role. On the other hand, static classes represent global state and lack instance data. Therefore, it is not feasible to use an instance -based expansion method. Console WriteBlueLine However, there is another solution: creating a static packaging class around the static

interface. This method eliminates the demand for the extension, because it can be added directly to the packaging class.

For example, the class that can be realized

, as shown below: ConfigurationManager

Through the call method, the code can avoid repeating the inconvenience of ConfigurationManagerWrapper.

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