问题
I have a EntityDataModel generated from my database. One of the Entity models has two properties that are both string types. One is Nullable=True and the other Nullable=False
How do I check the value of the Nullable property during runtime ?
回答1:
If your properties are decorated with attributes like [Required] or [StringLength] with a property MinimumLength set to a value greater then 0, you could use that property's GetType() method. This method will return an object of type Type and it has a number of other methods like GetCustomAttributes. This method will return all the custom attributes applied to your property.
As I said earlier, if you know which attributes were applied, like the ones mentioned, then using YourObject.YourProperty.GetType().GetCustomAttributes(true) will do the trick. You will need to go through the array and cast the result to the proper attribute.
来源：https://stackoverflow.com/questions/18710697/how-to-check-if-a-property-of-an-entity-framework-type-is-nullable