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Note The CLR doesn t require that value types define any constructors . However, this is a
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problem because all of the mechanisms in the preceding list construct an object by calling its constructor . However, Activator s CreateInstance methods will allow you to create an instance of a value type without calling a constructor . If you want to create an instance of a value type without calling a constructor, you must call the version of the CreateInstance method that takes a single Type parameter or the version that takes Type and Boolean parameters .
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Part IV
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Core Facilities
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The mechanisms just listed allow you to create an object for all types except for arrays (System.Array-derived types) and delegates (System.MulticastDelegate-derived types) . To create an array, you should call Array s static CreateInstance method (several overloaded versions exist) . The first parameter to all versions of CreateInstance is a reference to the Type of elements you want in the array . CreateInstance s other parameters allow you to specify various combinations of dimensions and bounds . To create a delegate, you should call Delegate s static CreateDelegate method (several overloads exist) . The first parameter to all versions of CreateDelegate is a reference to the Type of delegate you want to create . CreateDelegate s other parameters allow you to specify which instance method of an object or which static method of a type the delegate should wrap . To construct an instance for a generic type, first get a reference to the open type, and then call Type s public, instance MakeGenericType method, passing in an array of types that you want to use as the type arguments . Then, take the returned Type object and pass it into one of the various methods listed above . Here is an example:
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using System; using System.Reflection; internal sealed class Dictionary<TKey, TValue> { } public static class Program { public static void Main() { // Get a reference to the generic type's type object Type openType = typeof(Dictionary<,>); // Close the generic type by using TKey=String, TValue=Int32 Type closedType = openType.MakeGenericType(typeof(String), typeof(Int32)); // Construct an instance of the closed type Object o = Activator.CreateInstance(closedType); // Prove it worked Console.WriteLine(o.GetType()); } }
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If you compile the code shown above and run it, you get the following output:
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Dictionary`2[System.String,System.Int32]
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Designing an Application That Supports Add-Ins
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When you re building extensible applications, interfaces should be the centerpiece . You could use a base class instead of an interface, but in general, an interface is preferred because it allows add-in developers to choose their own base class . Suppose, for example, that you re writing an application and you want others to be able to create types that your application can load and use seamlessly . Here s the way to design this application:
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23 Assembly Loading and Reflection
Create a Host SDK assembly that defines an interface whose methods are used as the communication mechanism between the host application and the add-in components . When defining the parameters and return values for the interface methods, try to use other interfaces or types defined in MSCorLib .dll . If you want to pass and return your own data types, define them in this Host SDK assembly, too . Once you settle on your interface definitions, give this assembly a strong name (discussed in 3), and then package and deploy it to your partners and users . Once published, you should really avoid making any kind of breaking changes to the types in this assembly . For example, do not change the interface in any way . However, if you define any data types, it is OK to add new members . If you make any modifications to the assembly, you ll probably want to deploy it with a publisher policy file (also discussed in 3) . Note You can use types defined in MSCorLib .dll because the CLR always loads the version
of MSCorLib .dll that matches the version of the CLR itself . Also, only a single version of MSCorLib .dll is ever loaded into a CLR instance . In other words, different versions of MSCorLib .dll never load side by side (as described in 3) . As a result, you won t have any type version mismatches, and your application will require less memory .
The add-in developers will, of course, define their own types in their own Add-In assembly . Their Add-In assembly will reference the types in your Host SDK assembly . The add-in developers are able to put out a new version of their assembly as often as they d like, and the host application will be able to consume the add-in types without any problem whatsoever . Create a separate Host Application assembly containing your application s types . This assembly will obviously reference the Host SDK assembly and use the types defined in it . Feel free to modify the code in the Host Application assembly to your heart s desire . Because the add-in developers don t reference the Host Application assembly, you can put out a new version of it every hour if you want to and not affect any of the add-in developers .
This section contains some very important information . When using types across assemblies, you need to be concerned with assembly-versioning issues . Take your time to architect this cleanly by isolating the types that you use for communication across assembly boundaries into their own assembly . Avoid mutating or changing these type definitions . However, if you really need to modify the type definitions, make sure that you change the assembly s version number and create a publisher policy file for the new version . I ll now walk through a very simple scenario that puts all of this together . First, here is the code for the HostSDK .dll assembly:
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