HttpRequest.ServerVariables 使用 IIS7 在 WCF 中抛出 ArgumentException

问题描述

我们有一个在 IIS7 中运行的 WCF (.NET 3.5 SP1) 服务，它被标记为允许 ASP.NET 兼容模式，因此我们可以访问 HttpContext.Current:

We have a WCF (.NET 3.5 SP1) service running in IIS7, which is marked to allow ASP.NET compatibility mode so we can access HttpContext.Current:

[AspNetCompatibilityRequirements(
    RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

然而，当试图访问任何服务器变量时，它会抛出一个ArgumentException:

However, when trying to access any server variable it throws an ArgumentException:

System.ArgumentException: Value does not fall within the expected range.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Web.Hosting.IIS7WorkerRequest.GetServerVariableInternal(String name)
    at System.Web.Hosting.IIS7WorkerRequest.GetServerVariable(String name)
    at System.Web.Hosting.IIS7WorkerRequest.GetRemoteAddress()
    at System.Web.HttpRequest.get_UserHostAddress()

例如以下任何行都抛出此异常:

e.g. Any of the following lines throw this exception:

ha = HttpContext.Current.Request.UserHostAddress;
ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
us = HttpContext.Current.Request.UserAgent;

这似乎是内部框架调用的结果，这意味着调用代码没有问题.

This appears to be the result of an internal framework call, which means the calling code is not at fault.

大概是我们的配置中有什么东西导致了这个问题，但我不知道是什么.有任何想法吗?或者我还有什么办法可以检索这三位数据(不幸的是，它们似乎没有被 WCF 本地公开).

Presumably there is something in our configuration that is causing this problem, but I don't know what. Any ideas? Or any ideas how else I can retrieve these three bits of data (they don't appear to be exposed by WCF natively, unfortunately).

推荐答案

原来问题是操作标有...

Turns out the problem is that the operation is marked with...

[OperationContract(IsOneWay = true)]

...而且服务器变量在单向操作中不可用.

...and that server variables aren't available in one-way operations.

可惜例外并没有说明什么……

Shame the exception doesn't say something to that effect...

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