c# - Entity Framework code-first, error: "EntityType 'OfferSequence' has no key defined" -

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i using entity framework code-first. trying create new entity called offersequence, table automatically created in database.

the problem when try update database new entity, following error

one or more validation errors detected during model generation:

erp.enterprisedataaccesslayer.enterprisedata.offersequence: : entitytype 'offersequence' has no key defined. define key entitytype. offersequences: entitytype: entityset 'offersequences' based on type 'offersequence' has no keys defined.

however, can see below, key clearily defined on property sequencestart

public class offersequence : ientity<offersequence> {     public offersequence(uint sequencestart, uint incrementalcounter, uint annualincrementalcounter)     {         validate.ensureistrue(incrementalcounter >= sequencestart && annualincrementalcounter >= sequencestart, "counters can not lower sequence start");          sequencestart = sequencestart;         incrementalcounter = incrementalcounter;         annualincrementalcounter = annualincrementalcounter;         lastupdatedate = datetime.utcnow;     }      [key]     public uint sequencestart { get; private set; }      public uint incrementalcounter { get; private set; }      public uint annualincrementalcounter { get; private set; }      public datetime lastupdatedate { get; private set; }      public offersequence clone()     {         offersequence copy = new offersequence(sequencestart, incrementalcounter, annualincrementalcounter);          return copy;     }      object icloneable.clone()     {         return clone();     }      public void modify(offersequence obj)     {         annualincrementalcounter = obj.annualincrementalcounter;         incrementalcounter = obj.incrementalcounter;         lastupdatedate = datetime.utcnow;     } }

it appears cannot use unsigned int key in entity framework: don't have official says this, answer on this question suggests it, this one.

edit: here official word ef team regarding this. here's said:

ef team triage: unsigned integers not supported efs internal model uses store metadata. should consider supporting them, or having way deal types aren't explicitly supported.

the error message improved here , symptom of our rule code first ignores properties of unsupported types. detect situation , provide better message.

given in ef6 release aren't going change now. moving future consider upcoming releases.


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