Error - is not marked as serializable

Question

The error I\'m getting is:

Type \'OrgPermission\' in Assembly \'App_Code.ptjvczom, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null\' is not marked as s         


        

Answer 1

Leaving my specific solution of this for prosperity, as it's a tricky version of this problem:

Type 'System.Linq.Enumerable+WhereSelectArrayIterator[T...] was not marked as serializable

Due to a class with an attribute IEnumerable eg:

[Serializable]
class MySessionData{
    public int ID;
    public IEnumerable RelatedIDs; //This can be an issue
}

Originally the problem instance of MySessionData was set from a non-serializable list:

MySessionData instance = new MySessionData(){ 
    ID = 123,
    RelatedIDs = nonSerizableList.Select(item => item.ID)
};

The cause here is the concrete class that the Select(...) returns, has type data that's not serializable, and you need to copy the id's to a fresh List to resolve it.

RelatedIDs = nonSerizableList.Select(item => item.ID).ToList();