When you create an entity in Code First model, you might need a Guid field. In addition you might want SQL Server should auto-generate values for that field. This can be done with an annotation as following:
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[DatabaseGenerated(DatabaseGeneratedOption.Identity)] public Guid ClientGuid { get; set; } |
After migration you will find that ClientGuid field has a default value newsequentialid().
The most curious thing is the default value in SQL Server database could be created only at the creation of field itself. If you create a field without an identity option first, then you try to add annotation, SQL Server does not add a default value.
In that case you can recreate database (but it’s not appropriate in many cases) or to add a class constructor to explicitly assign new Guid value as following:
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public Client() { this.ClientGuid = System.Guid.NewGuid(); } |
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