本文整理汇总了C#中System.Reflection.EventInfo.AddEventHandler方法的典型用法代码示例。如果您正苦于以下问题:C# EventInfo.AddEventHandler方法的具体用法?C# EventInfo.AddEventHandler怎么用?C# EventInfo.AddEventHandler使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Reflection.EventInfo
的用法示例。
在下文中一共展示了EventInfo.AddEventHandler方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
using System.Reflection;
using System.Reflection.Emit;
public class Example
{
private static object timer;
public static void Main()
{
// Get the Timer type.
Type t = typeof(System.Timers.Timer);
// Create an instance of the Timer type.
timer = Activator.CreateInstance(t);
// Use reflection to get the Elapsed event.
EventInfo eInfo = t.GetEvent("Elapsed");
// In order to create a method to handle the Elapsed event,
// it is necessary to know the signature of the delegate
// used to raise the event. Reflection.Emit can then be
// used to construct a dynamic class with a static method
// that has the correct signature.
// Get the event handler type of the Elapsed event. This is
// a delegate type, so it has an Invoke method that has
// the same signature as the delegate. The following code
// creates an array of Type objects that represent the
// parameter types of the Invoke method.
//
Type handlerType = eInfo.EventHandlerType;
MethodInfo invokeMethod = handlerType.GetMethod("Invoke");
ParameterInfo[] parms = invokeMethod.GetParameters();
Type[] parmTypes = new Type[parms.Length];
for (int i = 0; i < parms.Length; i++)
{
parmTypes[i] = parms[i].ParameterType;
}
// Use Reflection.Emit to create a dynamic assembly that
// will be run but not saved. An assembly must have at
// least one module, which in this case contains a single
// type. The only purpose of this type is to contain the
// event handler method. (You can use also dynamic methods,
// which are simpler because there is no need to create an
// assembly, module, or type.)
//
AssemblyName aName = new AssemblyName();
aName.Name = "DynamicTypes";
AssemblyBuilder ab = AssemblyBuilder.DefineDynamicAssembly(aName, AssemblyBuilderAccess.Run);
ModuleBuilder mb = ab.DefineDynamicModule(aName.Name);
TypeBuilder tb = mb.DefineType("Handler", TypeAttributes.Class | TypeAttributes.Public);
// Create the method that will handle the event. The name
// is not important. The method is static, because there is
// no reason to create an instance of the dynamic type.
//
// The parameter types and return type of the method are
// the same as those of the delegate's Invoke method,
// captured earlier.
MethodBuilder handler = tb.DefineMethod("DynamicHandler",
MethodAttributes.Public | MethodAttributes.Static,
invokeMethod.ReturnType, parmTypes);
// Generate code to handle the event. In this case, the
// handler simply prints a text string to the console.
//
ILGenerator il = handler.GetILGenerator();
il.EmitWriteLine("Timer's Elapsed event is raised.");
il.Emit(OpCodes.Ret);
// CreateType must be called before the Handler type can
// be used. In order to create the delegate that will
// handle the event, a MethodInfo from the finished type
// is required.
Type finished = tb.CreateType();
MethodInfo eventHandler = finished.GetMethod("DynamicHandler");
// Use the MethodInfo to create a delegate of the correct
// type, and call the AddEventHandler method to hook up
// the event.
Delegate d = Delegate.CreateDelegate(handlerType, eventHandler);
eInfo.AddEventHandler(timer, d);
// Late-bound calls to the Interval and Enabled property
// are required to enable the timer with a one-second
// interval.
t.InvokeMember("Interval", BindingFlags.SetProperty, null, timer, new Object[] { 1000 });
t.InvokeMember("Enabled", BindingFlags.SetProperty, null, timer, new Object[] { true });
Console.WriteLine("Press the Enter key to end the program.");
Console.ReadLine();
}
}
输出:
Press the Enter key to end the program. Timer's Elapsed event is raised. Timer's Elapsed event is raised. Timer's Elapsed event is raised.