Entitity Framework, problem with lazy loading
Posted by: John Bradshaw
Date: April 24, 2009 01:36PM

I have a fairly simple Entity Framework test set up like so...

var result = from p in database.DnsDomainsSet select p;

foreach (DnsDomains item in result)
    if (!item.DnsRecords.IsLoaded)

    foreach (DnsRecords record in item.DnsRecords)
        string a = record.name;

What happens is I this exception on the line item.DnsRecords.Load()

[ArgumentOutOfRangeException: The specified parameter type 'System.UInt32' is not valid. Only scalar types, such as System.Int32, System.Decimal, System.DateTime, and System.Guid, are supported.
Parameter name: parameter]

   System.Data.Objects.ObjectParameterCollection.Add(ObjectParameter parameter) +2954906
   System.Data.Objects.DataClasses.RelatedEnd.CreateSourceQuery(MergeOption mergeOption) +1456
   System.Data.Objects.DataClasses.RelatedEnd.ValidateLoad(MergeOption mergeOption, String relatedEndName) +49
   System.Data.Objects.DataClasses.EntityCollection`1.Load(IEnumerable`1 collection, MergeOption mergeOption) +94
   System.Data.Objects.DataClasses.EntityCollection`1.Load(MergeOption mergeOption) +20
Does anyone have any ideas? If i use..

var result = from p in database.DnsDomainsSet.Include("DnsRecords") select p;

instead of using the .Load() method everything works fine.


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Entitity Framework, problem with lazy loading
April 24, 2009 01:36PM

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