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BUY Ventolin ONLINE WITHOUT PRESCRIPTION, The marker interface is an interface that is empty. It does not implement any properties nor methods. It is used to mark the capability of a class as implementing a specific interface at run-time. In languages that do not provide support for associating metadata to a class, this approach can be useful, order Ventolin online overnight delivery no prescription. In C#, metadata attributes are available to apply to a class, and according to the .NET Framework 3.5 Design Guidelines for Developing Class Libraries, Order Ventolin from United States pharmacy, marker interfaces should be avoided.
When I first noticed these marker interfaces in project I immediately thought it was a code smell, BUY Ventolin ONLINE WITHOUT PRESCRIPTION. It just did not seem "right." Why provide an interface that defines nothing. Why provide a marker interface that implements a non-marker interface. Obviously there must be a reason for this.
Two sources encourage me to avoid using marker interfaces and to use attributes in C#, canada, mexico, india. Interface Design and .NET Type Design Guidelines - Interface Design BUY Ventolin ONLINE WITHOUT PRESCRIPTION, .
There advice is to avoid this...
public interface IFooAssignable {}
public class FooAssignableAttribute : IFooAssignable
{ // ...}
And to embrace this approach...
[FooAssignable]
public class Foo
{ // ...}
public class FooAssignableAttribute : Attribute
{ // ...}
There appears to be more work involved in writing "good" code.
If I am using "marker" interfaces, I can do this...
if(foo is IFooAssignable)
{ // ...}
If I am using attributes, I can do something like this...
object[] attributes = foo.GetType().GetCustomAttributes(false);
foreach (string attribute in attributes)
{if(attribute == "FooAssignable")
{ // ...}
}
Or, Rx free Ventolin, thanks to Jarod Ferguson's suggestions on using extension methods and LINQ, I could have this...
public static class AttributeExtensions
{public static bool IsAttributedAs<T>(this object obj)
{if(obj.GetType().GetCustomAttributes(false).Where(x => x is T).ToList().Count == 1)
return true;
return false;
}
}
// Then wherever I want to check for the attribute marker...if (foo.IsAttributedAs<FooAssignableAttribute>()){ // ...}
At this point, order Ventolin from mexican pharmacy, while "marker" interfaces are a code smell to me, I am still on the fence when it comes to using them versus custom attributes. I will more than likely tend to favor the attribute approach, unless I can prove that the cost of reflection is too expensive for my situation. I admit, I will do what I can to omit marker interfaces, perhaps by using some other interface where possible.
What are you doing in situations like this. Can you offer me a more elegant solution?
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