如何检查实体框架类型的属性是否可为空
我有一个从数据库生成的EntityDataModel。
实体模型之一具有两个均为字符串类型的属性。
一个是Nullable = True，另一个是Nullable = False
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
如何在运行时检查Nullable属性的值？
How do I check the value of the Nullable property during runtime ?
如果您的属性以 [必需] 或 [属性为设置为大于0的值，则可以使用该属性的GetType（）方法。此方法将返回类型为 MinimumLength 的StringLength] Type 的对象，并且它具有许多其他方法，例如 GetCustomAttributes 。此方法将返回应用于属性的所有自定义属性。
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.
正如我之前说的，如果您知道应用了哪些属性（如所述属性），则使用 YourObject.YourProperty.GetType（）。GetCustomAttributes （true）可以解决问题。您将需要遍历数组并将结果强制转换为适当的属性。
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.