c# - How does the MetadataType attribute mark a class as a validation class in MVC? -

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i have ado entity generated in mvc 2 , know if want put custom validation on object can this.

[metadatatype(typeof(myentity_validation))] public partial class myentity {     private sealed class myentity_validation     {         [required]         [regularexpression("[a-za-z][0-9]{5}")]         public string somefield{ get; set; }      } }

but don't know why works.

how work? sort of convention?

metadata convention, yes. see http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.aspx. can add attributes fields enforce validation, display, concurrency, sorts of common usefulness. hope helps.


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