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@jbogard
Created November 7, 2013 14:15
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public class BetterDefaultModelBinder : DefaultModelBinder
{
protected override object CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType)
{
var model = base.CreateModel(controllerContext, bindingContext, modelType);
if (model == null || model is IEnumerable)
return model;
foreach (var property in modelType.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
object value = property.GetValue(model);
if (value != null)
continue;
if (property.PropertyType.IsArray)
{
value = Array.CreateInstance(property.PropertyType.GetElementType(), 0);
property.SetValue(model, value);
}
else if (property.PropertyType.IsGenericType)
{
Type typeToCreate;
Type genericTypeDefinition = property.PropertyType.GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(IDictionary<,>))
{
typeToCreate = typeof(Dictionary<,>).MakeGenericType(property.PropertyType.GetGenericArguments());
}
else if (genericTypeDefinition == typeof (IEnumerable<>) ||
genericTypeDefinition == typeof (ICollection<>) ||
genericTypeDefinition == typeof (IList<>))
{
typeToCreate = typeof(List<>).MakeGenericType(property.PropertyType.GetGenericArguments());
}
else
{
continue;
}
value = Activator.CreateInstance(typeToCreate);
property.SetValue(model, value);
}
}
return model;
}
}
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