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I'm creating a custom attribute in C# and I want to do different things based on whether the attribute is applied to a method versus a property. At first I was going to do new StackTrace().GetFrame(1).GetMethod() in my custom attribute constructor to see what method called the attribute constructor, but now I'm unsure what that will give me. What if the attribute was applied to a property? Would GetMethod() return a MethodBase instance for that property? Is there a different way of getting the member to which an attribute was applied in C#?
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property, AllowMultiple = true)] public class MyCustomAttribute : Attribute Update: okay, I might have been asking the wrong question. From within a custom attribute class, how do I get the member (or the class containing the member) to which my custom attribute was applied? Aaronaught suggested against walking up the stack to find the class member to which my attribute was applied, but how else would I get this information from within the constructor of my attribute?
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Retrieving a custom attribute is a simple process. First, declare an instance of the attribute you want to retrieve. Then, use the Attribute. GetCustomAttribute method to initialize the new attribute to the value of the attribute you want to retrieve.
The same you would normally check for an attribute on a class. Here's some sample code. typeof(ScheduleController) . IsDefined(typeof(SubControllerActionToViewDataAttribute), false);
AttributeUsage has a named parameter, AllowMultiple , with which you can make a custom attribute single-use or multiuse. In the following code example, a multiuse attribute is created. In the following code example, multiple attributes of the same type are applied to a class. [Author("P.
A custom attribute is a property that you can define to describe assets. Custom attributes extend the meaning of an asset beyond what you can define with the standard attributes. You can create a custom attribute and assign to it a value that is an integer, a range of integers, or a string.
Attributes provide metadata and don't know anything about the thing (class, member, etc.) they are decorating. On the other hand, the thing being decorated can ask for the attributes it is decorated with.
If you must know the type of the thing being decorated you will need to explicitly pass it to your attribute in its constructor.
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property, AllowMultiple = true)] public class MyCustomAttribute : Attribute { Type type; public MyCustomAttribute(Type type) { this.type = type; } } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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