使用反射调用 WCF 函数

本文介绍了使用反射调用 WCF 函数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个使用 NetTcpBinding 的 WCF 应用程序.我想使用 System.Reflection 命名空间中的 Methodbase.Invoke 调用 WCF 服务中的函数.换句话说，我想通过传递一个 String 作为函数名称来动态调用一个函数.

I have a WCF application that is using NetTcpBinding. I want to invoke the functions in WCF service using Methodbase.Invoke from the System.Reflection namespace. In other words I want to Dynamically call a Function by passing a String as the Function name.

反射非常适用于 Web 服务或 Windows 应用程序或任何 DLL 或类.所以当然有一种方法可以为 WCF 做到这一点，但我无法找到方法.

Reflection works great for Web Service or a Windows application or any DLL or class. So there is certainly a way to do this for WCF but I am unable to find out how.

我得到了程序集名称，然后输入一切正常，但因为我们无法创建接口类的实例.我尝试使用绑定打开 WCF 连接并尝试传递该对象，但它抛出异常:

I am getting the Assembly Name then it's type everything fine but as we cannot create an instance of the Interface class. I tried to open the WCF connection using the binding and tried to pass that object but it's throwing an exception as:

对象与目标类型不匹配."

"Object does not match target type."

我已经打开连接并传递了对象，类型仅为接口.我不知道是我尝试了错误的方法还是使用了错误的方法.知道我如何才能做到这一点吗?

I have opened the connection and passed the object and type is of interface only. I don't know whether I'm trying the wrong thing or am using the wrong way. Any idea how I can accomplish this?

NetTCPBinding 都是在打开连接时正确给出的.我正在使用 WCF 作为使用 NETTCPBinding 的 Windows 服务.

The NetTCPBinding all are properly given while opening the connection. I am using WCF as a Windows Service using NETTCPBinding.

推荐答案

在调用方法时传递了正确的实例.此实例是通过对 ChannelFactory 的基于接口的调用创建的代理对象.我在一个 hello world 风格的应用程序上尝试了你的技术并得到了预期的结果.我在您的代码示例中没有看到的一件事是您如何初始化参数.那可能是个问题.我相信您对 Type.GetType 的调用可能会导致您收到错误.请注意，我在 Proxy 对象上调用了 GetType.我在下面包含了我的示例代码，它调用了一个将一个参数作为整数的函数 GetData....

You are passing the correct instance when you invoke your method. This instance is the proxy object created via the interface-based call to ChannelFactory. I tried your technique on a hello world style application and got the expected results. One thing I don't see in your code example is how you initialize the parameters. That could be a problem. I believe think that your call to Type.GetType may be causing the error you are receiving. Notice I call GetType on the Proxy object. I include my sample code below that calls a Function GetData that takes one argument as an integer. ...

Dim myFactory As ChannelFactory(Of SimpleService.IService1) myFactory = New ChannelFactory(Of SimpleService.IService1)(myBinding, myEndpoint) oProxy = myFactory.CreateChannel() 'commented out version that does same call without reflection ' oProxy.GetData(3) Dim oType As Type = oProxy.GetType Dim oMeth As MethodInfo = oType.GetMethod("GetData") Dim params() As Object = {3} Dim sResults As String sResults = oMeth.Invoke(oProxy, BindingFlags.Public Or BindingFlags.InvokeMethod, Nothing, params, System.Globalization.CultureInfo.CurrentCulture)