wcf - 如何修复MaxItemsInObjectGraph错误？

我有一个RESTful WCF服务，并且出现以下错误:在对象图中可以序列化或反序列化的最大项目数为'65536'。更改对象图或增加MaxItemsInObjectGraph配额。

我以为我已经解决了这个问题，但显然没有解决。这是我的代码:

我使用一个.SVC文件，该文件使用如下所示的自定义工厂:

<%@ ServiceHost Language="C#" Debug="true" Service="myService" Factory="myCustomWebServiceHostFactory" %>

这是定制工厂的代码

public class myCustomWebServiceHost : WebServiceHost
{
    public myCustomWebServiceHost()
    {
    }

    public myCustomWebServiceHost(object singletonInstance, params Uri[] baseAddresses)
        : base(singletonInstance, baseAddresses)
    {
    }

    public myCustomWebServiceHost(Type serviceType, params Uri[] baseAddresses)
        : base(serviceType, baseAddresses)
    {
    }

    protected override void OnOpening()
    {
        foreach (var endpoint in Description.Endpoints)
        {
            var binding = endpoint.Binding as WebHttpBinding;
            if (binding != null)
            {
                const int fiveMegaBytes = 5242880;
                binding.MaxReceivedMessageSize = fiveMegaBytes;
                binding.MaxBufferSize = fiveMegaBytes;
                binding.MaxBufferPoolSize = fiveMegaBytes;
            }
        }
        base.OnOpening();
    }
}

class myCustomWebServiceHostFactory : WebServiceHostFactory
{
    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
    {
        return new myCustomWebServiceHost(serviceType, baseAddresses);
    }
}

服务:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceContract]
[ServiceBehavior(MaxItemsInObjectGraph = int.MaxValue)]
public class myService
{
...service implementation code goes here
}

客户:

public class myClient
{
    WebChannelFactory<IMyService> cf;
    IMyService channel;

    public myClient()
    {
        WebHttpBinding _binding = new WebHttpBinding();
        _binding.MaxBufferPoolSize = 5000000;
        _binding.MaxBufferSize = 5000000;
        _binding.MaxReceivedMessageSize = 5000000;
        _binding.TransferMode = TransferMode.Streamed;
        _binding.ReceiveTimeout = new TimeSpan(0, 0, 30);
        _binding.ReaderQuotas.MaxArrayLength = 5000000;
        Uri _uri = new Uri("http://myserviceurl");
        cf = new WebChannelFactory<IMyService>(_binding, _uri);
        channel = cf.CreateChannel();
        foreach (OperationDescription op in cf.Endpoint.Contract.Operations)
        {
            var dataContractBehavior = op.Behaviors.Find<DataContractSerializerOperationBehavior>();
            if (dataContractBehavior != null)
            {
                dataContractBehavior.MaxItemsInObjectGraph = int.MaxValue;
            }
        }
    }
        ...client implementation code goes here
}

更新:我已经做了一些故障排除。似乎序列化部分在服务器上工作正常。我可以从浏览器执行GET，然后以XML格式接收所有数据。这样就可以了。似乎是反序列化部分导致了错误。如果您在上面的代码中找到myClient，将看到我如何尝试为DataContractSerializer行为设置MaxItemsInObjectGraph属性。我这样做正确吗？

最佳答案

我想到了!!!我的客户代码是错误的。创建 channel 后，我正在设置MaxItemsInObjectGraph。因此，MaxItemInObjectGraph属性对已经创建的 channel 没有影响。 (WCF的这些内容使我感到困惑-我通常只是在不真正知道自己在做什么的情况下复制和粘贴代码)这是更正后的代码:

        WebHttpBinding _binding = new WebHttpBinding();
        _binding.MaxBufferPoolSize = 5000000;
        _binding.MaxBufferSize = 5000000;
        _binding.MaxReceivedMessageSize = 5000000;
        _binding.TransferMode = TransferMode.Streamed;
        _binding.ReceiveTimeout = new TimeSpan(0, 0, 30);
        _binding.ReaderQuotas.MaxArrayLength = 5000000;
        Uri _uri = new Uri(http://myserviceurl);
        cf = new WebChannelFactory<IMyService>(_binding, _uri);
        foreach (OperationDescription op in cf.Endpoint.Contract.Operations)
        {
            var dataContractBehavior = op.Behaviors.Find<DataContractSerializerOperationBehavior>();
            if (dataContractBehavior != null)
            {
                dataContractBehavior.MaxItemsInObjectGraph = int.MaxValue;
            }
        }
        channel = cf.CreateChannel();

关于wcf - 如何修复MaxItemsInObjectGraph错误？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6298209/