C# 需要哪些类型？
C# 的某些功能需要特定类型（“该类型必须实现 System.IDisposable”）。其他功能基于模式（“任何看起来像带有正确签名的 Select() 方法”的类型）。
C# 需要从库中获取的最小类型集是什么（上面的前一种情况）？这与 VB.NET 和 F# 等其他语言有何不同？
Possible Duplicate:
Which parts of C# .NET framework are actually parts of the language?
There are some features of C# that require specific type (“the type has to implement System.IDisposable”). Other features are based on patterns (“any type that has something that looks like a method called Select() with the proper signature”).
What is the minimum set of types that C# requires from the library (the former case above)? How does that differ from other languages like VB.NET and F#?
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IDisposable 是一个接口，.Net 提供接口作为开发基于契约的 API 的手段，而不是依赖于具体的类。例如，它可以让你说，“任何类型，只要它有一个名为 Dispose() 的方法”。
这与 C# 类型系统和原始类型没有太大关系。
IDisposable is an interface, .Net provivdes interfaces as a means to develop contract based APIs rather than relying on concrete classes. Eg, It lets you say, 'any type as long as it has a method called Dispose()'
This is nothing much to do with the C# type system nor it's primitive types.