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ASP.NET MVC ModelMetaData: Is there a way to set IsRequired based on the RequiredAttribute?

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难免孤独
难免孤独 2020-12-31 08:02

Brad Wilson posted a great blog series on ASP.NET MVC\'s new ModelMetaData: http://bradwilson.typepad.com/blog/2009/10/aspnet-mvc-2-templates-part-2-modelmetadata.html

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  • 礼貌的吻别
    礼貌的吻别 (楼主)
    2020-12-31 08:49

    You need to create your own ModelMetadataProvider. Here's an example using the DataAnnotationsModelBinder

    public class MyMetadataProvider : DataAnnotationsModelMetadataProvider
{
        protected override ModelMetadata CreateMetadata(Collections.Generic.IEnumerable attributes, Type containerType, Func modelAccessor, Type modelType, string propertyName)
        {
            var _default = base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);
            _default.IsRequired = attributes.Where(x => x is RequiredAttribute).Count() > 0;
            return _default;
        }
}



    Then in your AppStartup in Global.asax, you will want to put the following in to hookup the MyMetadataProvider as the default metadata provider:
    


    ModelMetadataProviders.Current = new MyMetadataProvider();

    
    
    
             
    
                                                        
    
            
            
    
              
                
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