WCF webservice流式响应的最佳实践 [英] Best practices for streaming response of WCF webservice

问题描述

我正在尝试从 WCF Web 服务中提取大量数据.请求相当小，响应消息将非常大.当前，由于 IIS6 对其可以分配的内存(~1.4GB)的限制，Web 服务正在抛出 SystemOutOfMemory 异常.

I'm trying to pull a large amount of data out of a WCF web service. The request is fairly small and the response message will be very big. Currently the web service is throwing SystemOutOfMemory exceptions due a limitation on IIS6 for the memory it can allocated (~1.4GB).

我在一些博客中读到实施流媒体将解决我的问题.

I have read in some blogs that implementing streaming will solve my problem.

有人可以分享他们在这个话题上的经验吗?我对任何示例客户端最感兴趣 &可以共享的服务端代码或任何建议/最佳实践.内存流与文件流?返回类型应该是 Stream、Message、Byte[]?

Can anybody share their experiences with this topic? I'm most interested in any sample client-side & service-side code that can be shared or any recommendations/best practices. MemoryStream vs FileStream? Return type should be Stream, Message, Byte[]?

我的操作如下所示:(通常它会在响应数组中返回大量元素，约 200K 个元素)

My operation looks like the following: (typically it will return a big number of elements in the response array, ~200K elements)

MediumSizeResponseClass[] GetData(SmallSizeRequestClass request)

推荐答案

如果您只想回传响应，请在绑定配置中使用 transferMode=streamedResponse.这确保只有返回的响应才会被流式传输.

If you want to stream back only the response, then use transferMode=streamedResponse in your binding configuration. This makes sure only the returned response will be streamed.

流函数的返回值必须是Stream.然后，您可以从该流中读取数据，并对其进行任何您需要做的事情(存储它、分析它等等).

The return value of a streaming function must be a Stream. You can then read from that stream and do whatever you need to do with it (store it, analyse it, whatever).

所以基本上你会有一个这样的服务合同:

So basically you'd have a service contract something like this:

[ServiceContract]
interface IYourService
{
    [OperationContract]
    Stream GetData(SmallSizeRequestClass request);
}

在服务器上，您基本上只是写入流，而在客户端上，您从流中读取.

On the server, you basically just write to a stream, while on the client, you read from the stream.

您是否查阅过有关 WCF 流 的 MSDN 文档?

Have you consulted the MSDN docs on WCF Streaming?

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