c# - 我们可以将类型限制为委托(delegate)吗

Question

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Answer 1

Delegate 是一个类，您通常可以指定一个非密封类作为约束。但是，语言规范明确将 System.Delegate 作为第 10.1.5 节中的有效约束排除在外。

A class-type constraint must satisfy the following rules:

• The type must be a class type.
• The type must not be sealed.
• The type must not be one of the following types: System.Array, System.Delegate, System.Enum, or System.ValueType.
• The type must not be object. Because all types derive from object, such a constraint would have no effect if it were permitted.
• At most one constraint for a given type parameter can be a class type.