A circular reference was detected while serializing an object of type 'System.Reflection.RuntimeModule'.

[Danferd Lan]

I'm getting this error message, "A circular reference was detected while serializing an object of type 'System.Reflection.RuntimeModule'. " when i change the DataSourceCachingMode to "ViewState".

Stack Trace:

[InvalidOperationException: A circular reference was detected while serializing an object of type 'System.Reflection.RuntimeModule'.]

   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2533
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +775
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2751
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeEnumerable(IEnumerable enumerable, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +186
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2699
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +775
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2751
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +775
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2751
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +775
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2751
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +775
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2751
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeEnumerable(IEnumerable enumerable, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +186
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2699
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +775
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2751
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +775
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +2751
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +372
   System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, StringBuilder output, SerializationFormat serializationFormat) +57
   System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, SerializationFormat serializationFormat) +82
   System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj) +44
   Syncfusion.JavaScript.Web.DropDownList.SaveViewState() +93
   System.Web.UI.Control.SaveViewStateRecursive(ViewStateMode inheritedMode) +93
   System.Web.UI.Control.SaveViewStateRecursive(ViewStateMode inheritedMode) +324
   System.Web.UI.Control.SaveViewStateRecursive(ViewStateMode inheritedMode) +324
   System.Web.UI.Control.SaveViewStateRecursive(ViewStateMode inheritedMode) +324
   System.Web.UI.Control.SaveViewStateRecursive(ViewStateMode inheritedMode) +324
   System.Web.UI.Control.SaveViewStateRecursive(ViewStateMode inheritedMode) +324
   System.Web.UI.Control.SaveViewStateRecursive(ViewStateMode inheritedMode) +324
   System.Web.UI.Page.SaveAllState() +568
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5314

[Keerthana Rajendran]

Hi Danferd, 

Thank you for contacting Syncfusion support we have tried a dropdown sample with DataSourceCachingmode:ViewState but we were unable to reproduce the issue in our end. 

Please refer the below given sample link: 

http://www.syncfusion.com/downloads/support/forum/124633/ze/Dropdown-977889783.zip 

Can you please share some more details to reproduce the issue  or modify our sample and attach in your next update so that we could analyze the issue and provide solution as soon as possible 

Regards, 

Keerthana. 

[Danferd Lan]

I was binding the control with the datatable and had the DataSourceCachingmode=ViewState, could it be the cause?

[Keerthana Rajendran]

Hi Danferd,   

  

We were able to reproduce the issue in our end. The issue is because of JavaScriptSerializer. JavaScriptSerializer is not able to convert the DataTable to JSON array directly that results with the circular reference error. To overcome, this error we suggest you to convert the DataTable to IEnumerable list when assigning it to DataSource property.   

   

For further references check the following links:
https://social.msdn.microsoft.com/Forums/en-US/da0bedf1-9299-4518-9d89-bc54edbe3e24/datatable-serialization-circular-reference-error?forum=asmxandxml 
http://stackoverflow.com/questions/30684514/a-circular-reference-was-detected-while-serializing-an-object-of-type-system-re 
http://forums.asp.net/t/1642962.aspx?Can+JsonResult+method+return+Data+Table+    

  

We have prepared sample with the suggested workaround. Please refer the below given link:   

http://www.syncfusion.com/downloads/support/forum/124633/ze/Sampledropdown-1396269199.zip   

   

Regards,   

Keerthana.