IDisposable 有什么用途? [英] What is IDisposable for?

问题描述

如果 .NET 有垃圾回收功能，那为什么还要显式调用 IDisposable?

If .NET has garbage collection then why do you have to explicitly call IDisposable?

推荐答案

垃圾回收是为了内存.您需要处理非内存资源 - 文件句柄、套接字、GDI+ 句柄、数据库连接等.这通常是 IDisposable 类型的基础，尽管实际的句柄可能在链中很长的参考资料.例如，您可以 Dispose 一个 XmlWriter 来处理它所引用的 StreamWriter，它会处理 FileStream它有一个引用，它释放文件句柄本身.

Garbage collection is for memory. You need to dispose of non-memory resources - file handles, sockets, GDI+ handles, database connections etc. That's typically what underlies an IDisposable type, although the actual handle can be quite a long way down a chain of references. For example, you might Dispose an XmlWriter which disposes a StreamWriter it has a reference to, which disposes the FileStream it has a reference to, which releases the file handle itself.

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