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Application to hook up. The invoice machine | api

It is not necessary to name a DynamicMethodso the empty string can be used.

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No additional assembly references are required for compiling from the command line. Clicking on the form causes the two ' delegates to be invoked. Invoke exFormAsObj, addHandlerArgs ' Event handler methods can also be generated at run time, ' using lightweight dynamic methods and Reflection.

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The following procedures show how to hook up an existing method to an event by getting all the necessary types through reflection, and how to create a dynamic method using reflection emit and hook it up to an event. Clicking the form invokes the event handler.

The new instance ' is stored as type Object, to maintain the fiction that ' nothing is known about the assembly. In the following code, the last argument associates the dynamic method with the current type, giving the delegate access to all the public and private members of the Example class.

Hook up your own application with The Machine's functionality.

Emit; using namespace System:: EventHandlerType ' If you already have a method Chronometric dating seriation the correct signature, ' you can simply get a MethodInfo for it.

For details, see the accompanying procedure, for generating an event handler at run time by using a dynamic method.

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The following code shows the form defined in the code example. CreateDelegate tDelegate, Me, miHandler Get the add accessor method and invoke it to hook up the event. Show method that takes a string, pops the return value off the stack because the handler has no return typeand returns.

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The last argument associates the ' dynamic method with the current type, giving the delegate ' access to all the public and private members of Example, ' as if it were an instance method. CreateDelegate tDelegate, Me, miHandler ' Get the "add" accessor of the event and invoke it late- ' bound, passing in the delegate instance.

Assembly ' Get the type that is to be loaded, and create an instance ' of it.

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Using the overloads of CreateDelegate that take a MethodInfo is recommended. All events have an add accessor and a remove accessor, which are hidden by the syntax of high-level languages. The instance on which the "add" accessor is invoked ' is the form; the arguments must be passed as an array.

Use the "add" accessor to add the delegate to ' the invocation list for the event.

Compiling the Code

Use the add accessor to add the delegate to the invocation list for the event. Call, simpleShow ; ilgen. The following code loads the form defined in the code example. CreateInstance also has an overload that ' takes an array of types representing the types of the ' constructor parameters, if the type you are creating does ' not have a parameterless constructor.

Show "This event handler just happened to be lying around.

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This method loads a string, calls the overload of the MessageBox. Ldstr, "This event handler was constructed at run time.

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The complete program code in the Example section later in this topic contains a method that matches the signature of Application to hook up EventHandler delegate, which handles the Click event, but you can also generate dynamic methods at run time.

The code for these methods can be found in the Example section later in this topic.