WCF中的Dynamic ExpandoObject

本文介绍了WCF中的Dynamic ExpandoObject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

[ServiceContract（CallbackContract = typeof（iStackoverflowCallBack））] public interface iStackoverflow { [OperationContract] void Ping（进程操作，动态数据）; } [ServiceContract（）] public interface iStackoverflowCallBack { [OperationContract] void Pong（进程操作，动态数据） ; }

为什么此服务连接有问题？

• 当实现两个界面动态自动转换为对象。
• 当从消费者那里获取我的服务 ping 时，ping根本没有达到服务但是服务正常工作。

解决方案：

[DataContract] public class SerializableDynamicObject：IDynamicMetaObjectProvider { [DataMember] private IDictionary< string，object> dynamicProperties = new Dictionary< string，object>（）; #region IDynamicMetaObjectProvider实现 public DynamicMetaObject GetMetaObject（Expression expression） { return new SerializableDynamicMetaObject（expression， BindingRestrictions.GetInstanceRestriction（expression，this） ， 这个）; } #endregion #region动态元对象支持的助手方法内部对象setValue（字符串名称，对象值） { dynamicProperties.Add（name，value）; 返回值; } 内部对象getValue（string name） {对象值; if（！dynamicProperties.TryGetValue（name，out value））{ value = null; } 返回值; } 内部IEnumerable< string> getDynamicMemberNames（） { return dynamicProperties.Keys; } #endregion } public class SerializableDynamicMetaObject：DynamicMetaObject { Type objType; public SerializableDynamicMetaObject（表达式表达式，BindingRestrictions限制，对象值）：base（表达式，限制，值） { objType = value.GetType（）; } public override DynamicMetaObject BindGetMember（GetMemberBinder binder） { var self = this.Expression; var dynObj =（SerializableDynamicObject）this.Value; var keyExpr = Expression.Constant（binder.Name）; var getMethod = objType.GetMethod（getValue，BindingFlags.NonPublic | BindingFlags.Instance）; var target = Expression.Call（Expression.Convert（self，objType）， getMethod， keyExpr）; 返回新的DynamicMetaObject（target， BindingRestrictions.GetTypeRestriction（self，objType））; } public override DynamicMetaObject BindSetMember（SetMemberBinder binder，DynamicMetaObject value） { var self = this.Expression; var keyExpr = Expression.Constant（binder.Name）; var valueExpr = Expression.Convert（value.Expression，typeof（object））; var setMethod = objType.GetMethod（setValue，BindingFlags.NonPublic | BindingFlags.Instance）; var target = Expression.Call（Expression.Convert（self，objType）， setMethod， keyExpr， valueExpr）; 返回新的DynamicMetaObject（target， BindingRestrictions.GetTypeRestriction（self，objType））; } public override IEnumerable< string> GetDynamicMemberNames（） { var dynObj =（SerializableDynamicObject）this.Value; return dynObj.getDynamicMemberNames（）; } }

解决方案

任何WCF操作合同的参数必须是WCF数据合约（或原始类型），否则数据将不会被序列化和传输。

msdn.microsoft/en-us/library/ms733127.aspx

Trying to Ping / Pong my service with an operation of enum type process and dynamic data.

[ServiceContract ( CallbackContract = typeof ( iStackoverflowCallBack ) )] public interface iStackoverflow { [OperationContract] void Ping ( Process Operation , dynamic Data ); } [ServiceContract ( )] public interface iStackoverflowCallBack { [OperationContract] void Pong ( Process Operation , dynamic Data ); }

Why this service having issues connecting ?

• When implementing both interfaces dynamic converted automatically to object.
• When pinging my service from consumer, the ping doesn't reach the service at all but the service is working properly.

Solution :

[DataContract] public class SerializableDynamicObject : IDynamicMetaObjectProvider { [DataMember] private IDictionary<string,object> dynamicProperties = new Dictionary<string,object>(); #region IDynamicMetaObjectProvider implementation public DynamicMetaObject GetMetaObject (Expression expression) { return new SerializableDynamicMetaObject(expression, BindingRestrictions.GetInstanceRestriction(expression, this), this); } #endregion #region Helper methods for dynamic meta object support internal object setValue(string name, object value) { dynamicProperties.Add(name, value); return value; } internal object getValue(string name) { object value; if(!dynamicProperties.TryGetValue(name, out value)) { value = null; } return value; } internal IEnumerable<string> getDynamicMemberNames() { return dynamicProperties.Keys; } #endregion } public class SerializableDynamicMetaObject : DynamicMetaObject { Type objType; public SerializableDynamicMetaObject(Expression expression, BindingRestrictions restrictions, object value) : base(expression, restrictions, value) { objType = value.GetType(); } public override DynamicMetaObject BindGetMember (GetMemberBinder binder) { var self = this.Expression; var dynObj = (SerializableDynamicObject)this.Value; var keyExpr = Expression.Constant(binder.Name); var getMethod = objType.GetMethod("getValue", BindingFlags.NonPublic | BindingFlags.Instance); var target = Expression.Call(Expression.Convert(self, objType), getMethod, keyExpr); return new DynamicMetaObject(target, BindingRestrictions.GetTypeRestriction(self, objType)); } public override DynamicMetaObject BindSetMember (SetMemberBinder binder, DynamicMetaObject value) { var self = this.Expression; var keyExpr = Expression.Constant(binder.Name); var valueExpr = Expression.Convert(value.Expression, typeof(object)); var setMethod = objType.GetMethod("setValue", BindingFlags.NonPublic | BindingFlags.Instance); var target = Expression.Call(Expression.Convert(self, objType), setMethod, keyExpr, valueExpr); return new DynamicMetaObject(target, BindingRestrictions.GetTypeRestriction(self, objType)); } public override IEnumerable<string> GetDynamicMemberNames () { var dynObj = (SerializableDynamicObject)this.Value; return dynObj.getDynamicMemberNames(); } }

解决方案

The arguments for any WCF Operation Contract must be WCF Data Contract (or primitive types) or else the data will not be serialized and transferred.

msdn.microsoft/en-us/library/ms733127.aspx