安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- c# - When why to use delegates? - Stack Overflow
A delegate can be seen as a placeholder for a some method(s) By defining a delegate, you are saying to the user of your class, "Please feel free to assign any method that matches this signature to the delegate and it will be called each time my delegate is called" Typical use is of course events
- oop - What is Delegate? - Stack Overflow
Delegate types are derived from the Delegate class in the NET Framework Delegate types are sealed—they cannot be derived Because the instantiated delegate is an object, it can be passed as a parameter, or assigned to a property This allows a method to accept a delegate as a parameter, and call the delegate at some later time
- c# - why can we declare delegates outside a class? Is it not against . . .
Actually Delegates are a type ( class) It is just a syntactic sugar, if you may, when you declare a delegate type public delegate int PerformCalculation(int x, int y); A delegate is a type that safely encapsulates a method Delegate types are derived from the Delegate class in the NET Framework
- . net - When would you use delegates in C#? - Stack Overflow
This declares a delegate type public delegate void DataReaderUser( System Data IDataReader dataReader ); Any method matching this signature can be used to instantiate a delegate of this type In C# 2 0, this can be done implicitly, simply by using method's name, as well as by using anonymous methods This method uses the type as a parameter
- c# - Invoke (Delegate) - Stack Overflow
Delegate are essentially inline Action's or Func<T> You can declare a delegate outside the scope of a method which you are running or using a lambda expression(=>); because you run the delegate within a method, you run it on the thread which is being run for the current window application which is the bit in bold Lambda example
- What is the difference between Func lt;string,string gt; and delegate?
The following 2 items are delegate declarations These are easy to spot because they will always contain the delegate keyword public delegate TReturn Func<TArg, TReturn>(Targ value); public delegate string convertMethod(string value); This line of code is assigning a value to a local which is typed to a delegate Func<string, string> local
- Cannot convert lambda expression to type System. Delegate
The problem is that you aren't providing the exact type of delegate you want to invoke Dispatcher Invoke just takes a Delegate Is it an Action<T>? If so, what is T? Is it a MethodInvoker? Action? What? If your delegate takes no arguments and returns nothing, you can use Action or MethodInvoker Try this: _uiDispatcher Invoke(new Action
- c# - How to use an event with a delegate - Stack Overflow
As far as I know the only thing about delegates is that , delegate is: A pointer to a method And it can call multiple methods at once But something I can't understand is that some users are declaring an event with the eventhandler the delegate For example: public void delegate MyDelegate(string Name); public event MyDelegate EventOfDelegate;
|
|
|