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} We are going to create an attribute that will modify the way that a class creates string representations of itself. This is similar to the way that the Flags attribute works, but we are going to apply it to a custom class. The attribute is called DetailLevel, and the class that implements the attribute is called DetailLevelAttribute. There is a constructor parameter that is used to set a public property called UseDetailed.

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We can apply the custom attribute to any class, but it only makes sense to do so for classes that understand the meaning of the attribute. Other classes will simply ignore it. Listing 17-8 contains a class that tests for the presence of the attribute. Listing 17-8. Using a Custom Attribute in a Class using System; class Car { public string Manufacturer {get; set;} public string Model {get; set;} public string Color {get; set;} public Car(string manufacturer, string model, string color) { Manufacturer = manufacturer; Model = model; Color = color; } public sealed override string ToString() { // see whether the attribute has been applied to this class DetailLevelAttribute attr = Attribute.GetCustomAttribute( this.GetType(), typeof(DetailLevelAttribute)) as DetailLevelAttribute; if (attr != null && attr.UseDetailed) { // we need to provide a detailed string representation return string.Format("Manufacturer: {0}, Model: {1}, Color: {2}", Manufacturer, Model, Color); } // we don't have an attribute, or we do have an attribute, but the // UseDetailed property is set to false - call the base implementation // of this method return base.ToString(); } } This class overrides the ToString method defined in the base class (System.Object). The derived version checks to see whether the attribute has been applied, and if it has and the constructor parameter has been set to true, then a more detailed string representation of the current Car object will be created.

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If the attribute has not been applied or if it has been applied but the constructor argument is set to false, then the base class implementation of the ToString method is used. We don t have to apply the attribute to the Car class, even though this is the class that knows the meaning of it. We can as easily apply it to a class derived from Car and get the desired result. Here is an example of a derived class that has been modified with the DetailLevel attribute: [DetailLevel(true)] class VolvoCar : Car { public VolvoCar(string model, string color) : base("Volvo", model, color) { // do nothing } } This class implements only a constructor. Note that it cannot override the base implementation of the ToString method. This is because I have modified the base implementation with the sealed keyword, which is described in 6. If the VolvoCar class were able to implement a new version of ToString, then we could end up with a base class that understands the meaning of the DetailLevel attribute and a derived class that ignores it. The following statements create an instance of the VolvoCar object and writes out a string representation of it: using System; class CustomAttributeTest { static void Main(string[] args) { VolvoCar myCar = new VolvoCar("C30", "Black"); Console.WriteLine("Car: {0}", myCar); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The output from these statements is as follows: Car: Manufacturer: Volvo, Model: C30, Color: Black Press enter to finish If I remove the attribute from the VolvoCar class and rerun the previous statements, I get the following results: Car: VolvoCar Press enter to finish

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You can see the effect of the attribute in the string representations of the VolvoCar objects. When the attribute is present and the constructor argument is set to true, we get a string representation that contains more detail than when the attribute is not present.

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