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在C＃中，在System.Collections.Generic.IEnumerable`1中IEnumerable之后1的含义是什么

[英]In C# what is the meaning of 1 after IEnumerable in System.Collections.Generic.IEnumerable`1

原文 2013-05-27 07:22:09 0 2 c#/ .net/ ienumerable

在IEnumerable之后1的含义是什么： System.Collections.Generic.IEnumerable`1

2 个解决方案

It is the generic arity of the type, or put another way, the number of type parameters a generic type supports. 它是该类型的通用arity，或换句话说，泛型类型支持的类型参数的数量。 IEnumerable<T> supports a single type parameter. IEnumerable<T>支持单个类型参数。 If you were to look at Dictionary<TKey, TValue> you would notice an arity value of 2. 如果您要查看Dictionary<TKey, TValue>您会注意到arity值为2。

Within the .NET type system, it is necessary that types have unique names. 在.NET类型系统中，类型必须具有唯一的名称。 Although it is only possible to create instances of bound generic types (eg IEnumerable<System.Int32> or IEnumerable<System.String> ), the unbound generic type may be used in certain contexts. 虽然只能创建绑定泛型类型的实例（例如IEnumerable<System.Int32>或IEnumerable<System.String> ），但未绑定的泛型类型可以在某些上下文中使用。 Within the language C#, such type would be written as IEnumerable<> but within the type system it is notated as IEnumerable~1 [~ used to avoid format problems]. 在C＃语言中，这种类型将被写为IEnumerable<>但在类型系统中，它被标记为IEnumerable~1 [〜用于避免格式问题]。 Note that the name of the bound generic type starts with the name of the unbound type, so if the unbound generic were called IEnumerable<> within the type system, the name of the bound generic would have to start with IEnumerable<> , including the back-to-back less-than-greater-than signs . 请注意，绑定泛型类型的名称以未绑定类型的名称开头，因此如果未绑定泛型在类型系统中被称为IEnumerable<> ，则绑定泛型的名称必须以IEnumerable<>开头， 包括背靠背不到大于标志 。