Stream.Length 抛出 NotSupportedException

问题描述

在发送到我的 WCF 方法中的 Stream 对象上尝试 stream.Length 时出现错误.

I am getting a error when attempting stream.Length on a Stream object sent into my WCF method.

Unhandled Exception!
 Error ID: 0
 Error Code: Unknown
 Is Warning: False
 Type: System.NotSupportedException
 Stack:    at System.ServiceModel.Dispatcher.StreamFormatter.MessageBodyStream.get_Length()

你如何获得流的长度?有什么例子吗?

How do you get the length of the stream? any examples?

推荐答案

Stream.Length 仅适用于可以进行查找的 Stream 实现.您通常可以检查 Stream.CanSeek 是真的.许多流，因为它们正在流式传输，因此不可能提前知道长度.

Stream.Length only works on Stream implementations where seeking is available. You can usually check to see if Stream.CanSeek is true. Many streams, since they're being streamed, are of a nature where it's impossible to know the length in advance.

如果您必须知道长度，您可能需要实际缓冲整个流，提前将其加载到内存中.

If you must know the length, you may need to actually buffer the entire stream, loading it into memory in advance.

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