Part III Essential Types in Visual C#.NET

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Part III Essential Types
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if ((other.m_accounts & m_accounts) != m_accounts) return false; return true; } // Objects match
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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 line below. // if (!base.Equals(obj)) return false; // // // // if // // // if Since 'this' isn't null, if obj is null, then the objects can't be equal NOTE: This line may be deleted 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: This line may be deleted if you trust that the base type implemented Equals correctly. (this.GetType() != obj.GetType()) return false;
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// Cast obj to our type to access fields. NOTE: This cast // can't fail since we know objects are of the same type AccountsAttribute other = (AccountsAttribute) obj; // // // if Compare the fields to see if they have the same value This example checks if 'this' accounts is the same as other's accounts (other.m_accounts != m_accounts) return false; // Objects are equal
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return true; }
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// Override GetHashCode since we override Equals public override Int32 GetHashCode() { return (Int32) m_accounts; } }
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[Accounts(Accounts.Savings)] internal sealed class ChildAccount { }
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[Accounts(Accounts.Savings | Accounts.Checking | Accounts.Brokerage)] internal sealed class AdultAccount { }
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public sealed class Program { public static void Main() { CanWriteCheck(new ChildAccount());
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18 Custom Attributes
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CanWriteCheck(new AdultAccount()); // This just demonstrates that the method works correctly on a // type that doesn't have the AccountsAttribute applied to it. CanWriteCheck(new Program()); } private static void CanWriteCheck(Object obj) { // Construct an instance of the attribute type and initialize it // to what we are 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, then the type can write a check ((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. Program types can NOT write checks.
Detecting the use of a Custom Attribute Without Creating Attribute-Derived Objects
In this section, I discuss an alternate technique for detecting custom attributes applied to a metadata entry . In some security-conscious scenarios, this alternate technique ensures that no code in an Attribute-derived class will execute . After all, when you call Attribute s GetCustomAttribute(s) methods, internally, these methods call the attribute class s constructor and can also call property set accessor methods . In addition, the first access to a type causes the CLR to invoke the type s type constructor (if it exists) . The constructor, set accessor, and type constructor methods could contain code that will execute whenever code is just looking for an attribute . This allows unknown code to run in the AppDomain, and this is a potential security vulnerability . To discover attributes without allowing attribute class code to execute, you use the System.Reflection.CustomAttributeData class . This class defines one static method for retrieving the attributes associated with a target: GetCustomAttributes . This method
Part III Essential Types
has four overloads: one that takes an Assembly, one that takes a Module, one that takes a ParameterInfo, and one that takes a MemberInfo . This class is defined in the System.Reflection namespace, which is discussed in 23 . Typically, you ll use the CustomAttributeData class to analyze attributes in metadata for an assembly that is loaded via Assembly s static ReflectionOnlyLoad method (also discussed in 23) . Briefly, ReflectionOnlyLoad loads an assembly in such a way that prevents the CLR from executing any code in it; this includes type constructors .
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