如何检查实体框架类型的属性是否可为空

Question

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 ?

Answer 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.