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How to set model properties during the Model Binding process?

开发者 https://www.devze.com 2023-01-06 20:34 出处:网络
Many of my model object inherit from a class called AuditedEntity that tracks the changes to the object.I would like to have my model objects that inherit from AuditedEntity automatically have the app

Many of my model object inherit from a class called AuditedEntity that tracks the changes to the object. I would like to have my model objects that inherit from AuditedEntity automatically have the appropriate fields populated when constructed during the model binding process. I have been looking into sub-classing the default model binder, but wit开发者_如何转开发hout much luck.

Can anyone point me in the correct direction?


Are these properties are populated with known values, or values from a good source. Or are these properties populated with values dependant on values from form/route/query etc?

Subclassing the DefaultModelBinder should be fine, e.g.:

public class MyModel
{
  public string Forename { get; set }

  public string SomeSpecialProperty { get; set; }
}

public MyModelBinder : DefaultModelBinder
{
  public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
  {
    var model = (MyModel)base.BindModel(controllerContext, bindingContext);

    model.SomeSpecialProperty = // Do something here...

    return model;
  }
}

ModelBinder.Binders[typeof(MyModel)] = new MyModelBinder();

What have you found so far?


I ended up having to rely on all the data having been bound. This was the solution I ended up using. placing the code in OnModelUpdated allowed me to rely on the other properties having been set.

public class AuditedEntityModelBinder : DefaultModelBinder
{

    protected override void OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        if (bindingContext.ModelType.IsSubclassOfGeneric(typeof(AuditedEntity<>)))
        {
            string name = controllerContext.HttpContext.User.Identity.Name;

            if(!name.IsNullOrEmpty())
            {
                if((bool) bindingContext.ModelType.GetProperty("IsNew").GetValue(bindingContext.Model, null))
                {
                    bindingContext.ModelType.GetProperty("CreatedBy").SetValue(bindingContext.Model, name, null);
                    bindingContext.ModelType.GetProperty("Created").SetValue(bindingContext.Model, DateTime.Now, null);
                }
                else
                {
                    bindingContext.ModelType.GetProperty("ModifiedBy").SetValue(bindingContext.Model, name, null);
                    bindingContext.ModelType.GetProperty("Modified").SetValue(bindingContext.Model, DateTime.Now, null);
                }

            } 
        }

        base.OnModelUpdated(controllerContext, bindingContext);
    }
}
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