c# - Entity Framework foreign key InvalidOperationException -

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is there way somehow output more details/information when invalidoperationexception 1 happens during savechanges() call?

the operation failed: relationship not changed because 1 or more of foreign-key properties non-nullable. when change made relationship, related foreign-key property set null value. if foreign-key not support null values, new relationship must defined, foreign-key property must assigned non-null value, or unrelated object must deleted.

i not removing db questions similar 1 didn't me. message quite self-explanatory, true, can't see mistake in code , helpful if exception gave more information property , foreign key in question.

edit - have checked innerexception , it's empty.

for example, if have next structure:

  public class client   {      public int clientid { get; set; }      public string name { get; set; }       public int clienttypeid { get; set; }      public clienttype clienttype { get; set; }   }    public class clienttype   {      public int clienttypeid { get; set; }      public string description { get; set; }   }

if changing "name" propertie example, property "clienttype" must null, otherwise try create,update or delete client type.

so set clienttype null, before savechanges();

if post more of code, can sure exactlly it's happening, guess


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