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Author:	Steve Gray	Created:	4/12/2011 8:51 AM
Tips, Tricks, Tutorials, and Code Examples for WCF

Change the object graph or increase the MaxItemsInObjectGraph quota

By Steve Gray on 4/12/2011 8:56 AM

The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://v100k.Web.Services:GetListOfOrdersResult. The InnerException message was 'Maximum number of items that can be serialized or deserialized in an object graph is '65536'. Change the object graph or increase the MaxItemsInObjectGraph quota. '. Please see InnerException for more details.

I’m not sure that I’ve quite got the handle on the above issue, but I did get it fixed, and I’m going to put as much here as I can in case I run into it again.

The key was to add an EndpointBehavior to the app.config file and then to reference it in the Client Endpoint. Find both occurrences of ‘LargeObjectGraphBehavior in the code below:

Code Snippet

  <system.serviceModel>
    <behaviors>
      <endpointBehaviors>
        <behavior name="LargeObjectGraphBehavior">
          <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
        behavior> 
      endpointBehaviors> 
    behaviors> 
 
    <bindings>
          <wsHttpBinding>
              <binding name="WSHttpBinding_IAccountingService" closeTimeout="00:01:00"
                  openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                  bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
                  maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
                  messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
                  allowCookies="false">
                  <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="2147483647"
                      maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                  <reliableSession ordered="true" inactivityTimeout="00:10:00"
                      enabled="false" />
                  <security mode="Transport">
                      <transport clientCredentialType="Basic" proxyCredentialType="None"
                          realm="" />
                      <message clientCredentialType="Windows" negotiateServiceCredential="true" />
                  security> 
              binding> 
          wsHttpBinding> 
      bindings> 
      <client>
          <endpoint address=https://api.mobi/AccountingService.svc
                binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IAccountingService"behaviorConfiguration="LargeObjectGraphBehavior"
              contract="AccountingService.IAccountingService" name="WSHttpBinding_IAccountingService" />
      client> 
  system.serviceModel> 

Next, in code, I had to change this:

Code Snippet

Dim oAccountingServiceClient As New AccountingService.AccountingServiceClient(myBinding, ea)

To this:

Code Snippet

Dim oAccountingServiceClient As New AccountingService.AccountingServiceClient
oAccountingServiceClient.Endpoint.Binding = myBinding
oAccountingServiceClient.Endpoint.Address = ea

Apparently using the constructor wiped out the additional behavior.

I’m going include the entire method below in case I need it later… but the essentials are above

Code Snippet

Private Sub btnGetOrders_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetOrders.Click
    Me.txtOutput.Text = ""
    Me.Enabled = False
    Me.Cursor = Cursors.WaitCursor
 
    ' Create the binding.
    Dim myBinding As New ServiceModel.WSHttpBinding
    myBinding.Security.Mode = ServiceModel.SecurityMode.Transport
    myBinding.Security.Transport.ClientCredentialType = ServiceModel.HttpClientCredentialType.Basic
    myBinding.MaxReceivedMessageSize = Int32.MaxValue
    myBinding.MaxBufferPoolSize = Int32.MaxValue
 
    ' Create the endpoint address. 
    Dim ea As New ServiceModel.EndpointAddress("https://myService.svc")
 
    Dim oAccountingServiceClient As New AccountingService.AccountingServiceClient
    oAccountingServiceClient.Endpoint.Binding = myBinding
    oAccountingServiceClient.Endpoint.Address = ea
 
    oAccountingServiceClient.ClientCredentials.UserName.UserName = myUser
    oAccountingServiceClient.ClientCredentials.UserName.Password = myPass
 
    Dim oResponse As New AccountingService.ServiceResponseOfAccountingOrder_PpHTjTPR
    Dim oAccountingOrders() As AccountingOrder
 
    Try
        oResponse = oAccountingServiceClient.GetListOfOrders(Me.dtOrdersDate.Value)
 
        If oResponse.responseCode.value <> ServiceResponseCode.Success Then
            Throw New Exception(oResponse.messages.ToString)
        End If
 
        'get the orders
        oAccountingOrders = oResponse.returnValue
 
        'deserialize the orders into an XElement
        Dim sw As New IO.StringWriter
        Dim oSerializer As New Xml.Serialization.XmlSerializer(oAccountingOrders.GetType)
 
        oSerializer.Serialize(sw, (oAccountingOrders))
        Dim xElem As XElement = XElement.Parse(sw.ToString)
 
        'display the xml in the form
        Me.txtOutput.Text = xElem.ToString
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try
 
    Me.Enabled = True
    Me.Cursor = Cursors.Default
 
End Sub

As always, I welcome your comments!