network adapter driver error code 39 Matching Two Attribute Instances Against Each Other in .NET framework

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Matching Two Attribute Instances Against Each Other
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Now that your code knows how to check to see whether an instance of an attribute is applied to a target, it might want to check the fields of the attribute to see what values they have. One way to do this is to write code that checks the values of the type s fields. However, your attribute type could also override System.Attribute s Match method. Then your code could construct an instance of the attribute type and call Match to compare it to the instance that was applied to the target. The following code demonstrates.
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using System; [Flags] public enum Accounts { Savings = 0x0001, Checking = 0x0002, Brokerage = 0x0004 } [AttributeUsage(AttributeTargets.Class)] public class AccountsAttribute : Attribute { private Accounts accounts; public AccountsAttribute(Accounts accounts) { this.accounts = accounts; } public override Boolean Match(object obj) { // If the base class implements Match and the base class // is not Attribute, then uncomment the following line. // if (!base.Match(obj)) return false; // // // // if Because this isn t null, if obj is null, then the objects can t match. NOTE: You can delete this line if you trust that the base type implemented Match correctly. (obj == null) return false;
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// // // if
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If the objects are of different types, they can t match. NOTE: You can delete this line if you trust that the base type implemented Match correctly. (this.GetType() != obj.GetType()) return false;
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// Cast obj to your type to access fields. // NOTE: This cast can t fail because you know that objects // are of the same type. AccountsAttribute other = (AccountsAttribute) obj; // // // if Compare the fields as you see fit. This example checks whether this accounts is a subset of other s accounts. ((other.accounts & accounts) != accounts) return false; // Objects match
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return true; }
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public override Boolean Equals(object obj) { // If the base class implements Equals and the base class // is not Object, then uncomment the following line. // if (!base.Equals(obj)) return false; // // // // if // // // if Because this isn t null, if obj is null, then the objects can t be equal. NOTE: You can delete this line if you trust that the base type implemented Equals correctly. (obj == null) return false; If the objects are of different types, they can t be equal. NOTE: You can delete this line if you trust that the base type implemented Equals correctly. (this.GetType() != obj.GetType()) return false;
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// Cast obj to your type to access fields. // NOTE: This cast can t fail because you know that objects // are of the same type. AccountsAttribute other = (AccountsAttribute) obj; // // // if Compare the fields to see whether they have the same value. This example checks whether this accounts is the same as other s accounts. (other.accounts != accounts) return false; // Objects are equal.
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return true; }
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// Override GetHashCode because Equals is overloaded. public override Int32 GetHashCode() { return (Int32) accounts; } } [Accounts(Accounts.Savings)] class ChildAccount { } [Accounts(Accounts.Savings | Accounts.Checking | Accounts.Brokerage)] class AdultAccount { } class App { static void Main() { CanWriteCheck(new ChildAccount());
CanWriteCheck(new AdultAccount()); // This just demonstrates that the method works correctly on a // type that doesn t have any AccountsAttribute attributes // applied to it. CanWriteCheck(new App()); } public static void CanWriteCheck(Object obj) { // Construct an instance of the attribute type, and initialize it // to what you re explicitly looking for. Attribute checking = new AccountsAttribute(Accounts.Checking); // Construct the attribute instance that was applied to the type. Attribute validAccounts = Attribute.GetCustomAttribute( obj.GetType(), typeof(AccountsAttribute), false); If the attribute was applied to the type AND the attribute specifies the "Checking" account, write a check from this object. ((validAccounts != null) && checking.Match(validAccounts)) { Console.WriteLine("{0} types can write checks.", obj.GetType()); } else { Console.WriteLine("{0} types can NOT write checks.", obj.GetType()); } } } // // // if
Building and running this application yields the following output:
ChildAccount types can NOT write checks. AdultAccount types can write checks. App types can NOT write checks.
You ll notice that the code for Match is almost identical to the code for Equals (discussed in 6); that is, in both, you must cast carefully and you must remember to call the base type s Match method if appropriate. If you define a custom attribute and you don t override the Match method, you ll inherit the implementation of Attribute s Match method. This implementation simply calls Equals.
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