如何使用System.Net.ConnectStream？

问题描述

我试图让我周围的一些我的前辈代码谁，有益，采用无功申报一切头。

I am trying to get my head around some of my predecessors code who, helpfully, has used 'var' to declare everything.

我有一个使用声明，是如下：

I have a using statement which is below:

using (var postStream = request.GetRequestStream())
{
    postStream.Write(byteData, 0, byteData.Length);
}

当我把这里断点，postStream显示了在汽车窗口系统.Net.ConnectStream。而不是变种我想用'Co​​nnectStream，但编译器不喜欢这样。

When I put a breakpoint here, postStream shows up in the Autos window as System.Net.ConnectStream. Instead of 'var' I want to use 'ConnectStream' but the compiler doesn't like this.

我在想什么，为什么我不能写我喜欢的代码这样的：

What am I missing, why can't I write my code like this:

using (ConnectStream postStream = request.GetRequestStream())
{
    postStream.Write(byteData, 0, byteData.Length);
}

我知道这是微不足道，但我总是被告知不要使用无功除非你有特殊原因，这样做（例如使用LINQ处理时）。难道我错了吗？

I know this is trivial but I was always taught not to use 'var' unless you have a specific reason to do so (such as when dealing with LINQ). Am I wrong?

感谢

推荐答案

ConnectStream 是一个内部类，你可以没有明确使用它。但是没关系，因为你不需要知道它的实际类型是 ConnectStream ：所有你需要知道的是，这是一个流，实际执行并不重要。

ConnectStream is an internal class, you can't use it explicitly. But it doesn't matter, because you don't need to know that its actual type is ConnectStream: all you need to know is that it's a Stream (the return type declared by GetRequestStream), the actual implementation doesn't really matter.

如果你希望明确指定类型，只写这样的：

If you want to specify the type explicitly, just write it like this:

using (Stream postStream = request.GetRequestStream())
{
    postStream.Write(byteData, 0, byteData.Length);
}

（但它有确切的含义与使用相同的 VAR ）

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