WCF：Maximum number of items that can be serialized or deserialized in an object graph is '65536'.

出现此错误的原因是WCF默认的序列化值不够，导致查询大数量的时候报错，解决的方法是修改序列化的值，可在配置文件中修改，或者在代码中修改：

1、改配置文件：

在behaviors中添加<dataContractSerializer maxItemsInObjectGraph="2147483647"/>，如下：

<behaviors>
<serviceBehaviors>
<behavior name="serviceBehavior">

          <!--序列化大小设置-->

          <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
</behavior>
</serviceBehaviors>
</behaviors>

客户端配置文件也添加<dataContractSerializer maxItemsInObjectGraph="2147483647"/>

2、代码修改,在代理类中添加如下代码：

服务器端：

ServiceHost host = new ServiceHost(serviceType, uri);

foreach (IServiceBehavior behavior in host.Description.Behaviors)

{

if (behavior is ServiceBehaviorAttribute)

{

(behavior as ServiceBehaviorAttribute).MaxItemsInObjectGraph = int.MaxValue;

}

}

客户端：

ChannelFactory模式如下修改：

ChannelFactory<T> channelFactory = new ChannelFactory<T>(binding);

foreach (OperationDescription op in channelFactory.Endpoint.Contract.Operations)

{

DataContractSerializerOperationBehavior dataContractBehavior = op.Behaviors.Find<DataContractSerializerOperationBehavior>() as DataContractSerializerOperationBehavior;

if (dataContractBehavior != null)

{

dataContractBehavior.MaxItemsInObjectGraph = int.MaxValue;

}

}

ClientBase模式做如下修改：

EndpointAddress address = new EndpointAddress("http://10.0.0.1/TestService.svc/PC");

            WSHttpBinding binding = new WSHttpBinding();

Service service = new Service(binding, address);

foreach (OperationDescription op in
service .Endpoint.Contract.Operations)

            {

                DataContractSerializerOperationBehavior dataContractBehavior = op.Behaviors.Find<DataContractSerializerOperationBehavior>() as DataContractSerializerOperationBehavior;

                if (dataContractBehavior != null)

                {

                    dataContractBehavior.MaxItemsInObjectGraph = int.MaxValue;

                }

            }