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C# Error Serializing Value Viewstate

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Sys.webforms.pagerequestmanagerservererrorexception: Error Serializing Value

Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error serializing for view state up vote 2 down vote favorite I am having problems serialising data for

Error Serializing Value System Collections Generic List Of Type System Collections Generic List

the view state. I am using VS2010 and when trying to add a property to the view state I get the following error message: Error serializing value 'System.Collections.Generic.List`1[Access.ARW.Business.Filters.Parameters.Parameter]' of type 'System.Collections.Generic.List`1[[Access.ARW.Business.Filters.Parameters.Parameter, Access.ARW.Business, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].' I have added a [Serializable] attribute above the classes I am trying to serialise but I still get this error...any ideas Here is the property declaration which is in Class A: private List ReportParameters { get { if (ViewState["ReportParameters"] == null) { ViewState["ReportParameters"] = new List(); } return (List) ViewState["ReportParameters"]; } set { ViewState["ReportParameters"] = value; } } c# asp.net serialization share|improve this question edited Sep 6 '12 at 13:43 Owen Blacker 2,4891957 asked Feb 2 '12 at 16:59 user559142 3,7432985153 2 Does your class contain further objects? If so everything in your object hierarchy must be marked [Serializable] –Peter Monks Feb 2 '12 at

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help? Post your question and get tips & solutions from a community of 418,461 IT Pros & Developers. It's quick & easy. How can I add generic list to a serializable class? P: n/a mark4asp I need to add an item to this class which I would like to be public IncumbentManager List; (alternatively it may be an arraylist, but I prefer a List) This is the simplifed code below for the Class: ActivityData with just two variables: ActivityID, ClosingDate. How do I deal with this in the constructor? SerializationInfo is a sealed class. [Serializable()] private class ActivityData : ISerializable { public int ActivityID = 0; public List); ClosingDate = info.GetDateTime("ClosingDate"); } void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { info.FullTypeName = "Administration_MandateEdit+ActivityData"; info.AddValue("ActivityID", ActivityID); // Is this correct? info.AddValue("IncumbentManager", IncumbentManager); info.AddValue("ClosingDate", ClosingDate); } } PS: Not all ActivityData objects will have a value for IncumbentManager. Jun 1 '07 #1 Post Reply Share this Question 4 Replies P: n/a mark4asp I write this code (below) and I get a compilation error: System.Collections.Generic.List' is a 'type' but is used like a 'variable' on this line: Incumbents = info.GetValue("Incumbents", List); yet when I look at SerializationInfo I see this header: public object GetValue(string name, Type type); [Serializable()] private class ActivityData : ISerializable { public int ActivityID = 0; public List); ClosingDate = info.GetDateTime("ClosingDate"); } void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { info.FullTypeName = "Administration_MandateEdit+ActivityData"; info.AddValue("ActivityID", ActivityID); info.AddValue("Incumbents", Incumbents); info.AddValue("ClosingDate", ClosingDate); } } Jun 1 '07 #2 P: n/a Jon Skeet [C# MVP] On Jun 1, 1:17 pm, mark4asp

 

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