配置问题

Question

想用代码在客户端创建代理, 提示只能添加一次. 请问该怎么解决?

代码:

            ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
            smb.HttpGetEnabled = true;
            this.Description.Behaviors.Add(smb);

            ServiceDebugBehavior sdb = new ServiceDebugBehavior();
            sdb.IncludeExceptionDetailInFaults = true;
            this.Description.Behaviors.Add(sdb);

 出错信息:

The value could not be added to the collection, as the collection already contains an item of the same type: 'System.ServiceModel.Description.ServiceDebugBehavior'. This collection only supports one instance of each type.
Parameter name: item

 

Answer 1

应该是已经包含了一个ServiceDebugBehavior ，你代码做个判断，把ServiceDebugBehavior 从服务行文里取取出来进行操作。

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Frank Xu Lei--谦卑若愚，好学若饥
专注于.NET平台下分布式应用系统开发和企业应用系统集成
Focus on Distributed Applications Development and EAI based on .NET
欢迎访问老徐的中文技术博客：Welcome to My Chinese Technical Blog
欢迎访问微软WCF中文技术论坛：Welcome to Microsoft Chinese WCF Forum
欢迎访问微软WCF英文技术论坛：Welcome to Microsoft English WCF Forum

Answer 2

尝试很久, 都无法实现. 该怎么改?

Answer 3

其实WCF默认已经添加了这些服务行为，我们需要更新现有的配置就可以，加一个反而出错。

这个是我跟踪查找到的4个已有的服务行为，

+  [0] {System.ServiceModel.ServiceBehaviorAttribute} System.ServiceModel.Description.IServiceBehavior {System.ServiceModel.ServiceBehaviorAttribute}
+  [1] {Microsoft.VisualStudio.Diagnostics.ServiceModelSink.Behavior} System.ServiceModel.Description.IServiceBehavior {Microsoft.VisualStudio.Diagnostics.ServiceModelSink.Behavior}
+  [2] {System.ServiceModel.Description.ServiceAuthorizationBehavior} System.ServiceModel.Description.IServiceBehavior {System.ServiceModel.Description.ServiceAuthorizationBehavior}
+  [3] {System.ServiceModel.Description.ServiceDebugBehavior} System.ServiceModel.Description.IServiceBehavior {System.ServiceModel.Description.ServiceDebugBehavior}

这样就可以了

                ServiceMetadataBehavior smb = host.Description.Behaviors.Find<ServiceMetadataBehavior>();
                smb.HttpGetEnabled = true;
                host.Description.Behaviors.Add(smb);

                ServiceDebugBehavior sdb = host.Description.Behaviors.Find<ServiceDebugBehavior>();
                sdb.IncludeExceptionDetailInFaults = true;
                host.Description.Behaviors.Add(sdb);

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Frank Xu Lei--谦卑若愚，好学若饥
专注于.NET平台下分布式应用系统开发和企业应用系统集成
Focus on Distributed Applications Development and EAI based on .NET
欢迎访问老徐的中文技术博客：Welcome to My Chinese Technical Blog
欢迎访问微软WCF中文技术论坛：Welcome to Microsoft Chinese WCF Forum
欢迎访问微软WCF英文技术论坛：Welcome to Microsoft English WCF Forum

Answer 4

            public PollingDuplexServiceHost(params Uri[] addresses)
                : base(typeof(Servico), addresses)
            {
                ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
                smb.HttpGetEnabled = true;
                this.Description.Behaviors.Add(smb);
            }

刚刚测试，以上代码可以正常运行，以下代码是根据您提供而改写的，提示信息：“远程服务器返回了错误: NotFound。”

            public PollingDuplexServiceHost(params Uri[] addresses)
                : base(typeof(Servico), addresses)
            {
                ServiceMetadataBehavior smb = this.Description.Behaviors.Find<ServiceMetadataBehavior>();
                smb.HttpGetEnabled = true;
                this.Description.Behaviors.Add(smb);
            }