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Invoke exFormAsObj, addHandlerArgs ' Event handler methods can also be generated at run time, ' using lightweight dynamic methods and Reflection.
In this case, the executing assembly is loaded, to ' keep the demonstration simple. Assemblies are usually loaded with the Assembly. In some cases a quick, over the counter fix is possible and in other more complex cases involving part replacements more time will be needed.
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To learn more about emitting dynamic methods, see Hookup vs hook up to: Of course, every computer will have different issues. Run CType exFormAsObj, Form Example The following code example shows how to hook up an existing method to an event using reflection, and also how to use the DynamicMethod class to emit a method at run time and hook it up to an event.
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 Best marijuana dating site event.
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Clicking the form invokes both the predefined event handler and the emitted event handler. Reflection; using namespace System:: The CreateInstance Type method is used in the following code because the form has a default constructor.
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.
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The new instance is stored as type Object to maintain the fiction that nothing is known about the assembly. Compile the code at the command line using csc.
In Visual Studio you must add a reference to System. GetMethod "Show", showParameters ilgen. There are several other overloads of Hookup vs hook up CreateInstance method that you can use if the type you are creating does not have a default constructor.
Ldstr, "This event handler was constructed at run time. To compile the code in Visual Studio, place it in a console application project template. Using the overloads of CreateDelegate that take a MethodInfo is recommended.
New customers to the Hook-Up can be surprised and even disconcerted when our employees deviate from this model. The instance on which the "add" accessor is invoked ' is the form; the arguments must be passed as an array. This method loads a string, calls ' the Show method overload that takes a string, pops the ' return value off the stack because the handler has no ' return typeand returns.
The complete program code in the Example section later in this topic contains a method that matches the signature of the EventHandler delegate, which handles the Click event, but you can also generate dynamic methods at run time.
Compiling the Code
No additional assembly references are required for compiling from the command line. Call, simpleShow ; ilgen. CreateDelegate tDelegate, Me, miHandler ' Get the "add" accessor of the event and invoke it late- ' bound, passing in the delegate instance.
To construct an event handler, you need the return type and parameter types of the delegate. Making an appointment or waiting for hours to meet a technician is never the situation here.
These can be obtained by examining the delegate's Invoke method.
This approach to customer service is not new—it simply harkens back to a lost time before everything in life got standardized. GetParameters ' Dimension this array Length - 1, because VB adds an extra ' element to zero-based arrays.
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All events have an add accessor and a remove accessor, which are hidden by the syntax of high-level languages. Use the add accessor to add the delegate to the invocation list for the event.
Show method that takes a string, pops the return value off the stack because the handler has no return typeand returns. Clicking the form invokes the event handler. Note For another way to hook up an event-handling delegate, see the code example for the AddEventHandler method of the EventInfo class.
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