Delegate Class

Definition

public ref class Delegate abstract

public ref class Delegate abstract : ICloneable, System::Runtime::Serialization::ISerializable

public abstract class Delegate

public abstract class Delegate : ICloneable, System.Runtime.Serialization.ISerializable

[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDual)]
[System.Serializable]
public abstract class Delegate : ICloneable, System.Runtime.Serialization.ISerializable

[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDual)]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class Delegate : ICloneable, System.Runtime.Serialization.ISerializable

type Delegate = class

type Delegate = class
    interface ICloneable
    interface ISerializable

[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDual)>]
[<System.Serializable>]
type Delegate = class
    interface ICloneable
    interface ISerializable

[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDual)>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type Delegate = class
    interface ICloneable
    interface ISerializable

Public MustInherit Class Delegate

Public MustInherit Class Delegate
Implements ICloneable, ISerializable

Inheritance

Object

Delegate

Derived

Microsoft.Aspnet.Snapin.DialogProc

Microsoft.Aspnet.Snapin.PropSheetPageProc

Microsoft.Extensions.Caching.Memory.PostEvictionDelegate

Microsoft.Extensions.DependencyInjection.ObjectFactory

Microsoft.Extensions.DependencyInjection.ObjectFactory<T>

More…

Attributes

ClassInterfaceAttribute SerializableAttribute ComVisibleAttribute

Implements

ICloneable ISerializable

Remarks

The Delegate class is the base class for delegate types. However, only the system and compilers can derive explicitly from the Delegate class or from the MulticastDelegate class. It is also not permissible to derive a new type from a delegate type. The Delegate class is not considered a delegate type; it is a class used to derive delegate types.

Most languages implement a delegate keyword, and compilers for those languages are able to derive from the MulticastDelegate class; therefore, users should use the delegate keyword provided by the language.

The common language runtime provides each delegate type with BeginInvoke and EndInvoke methods, to enable asynchronous invocation of the delegate. For more information about these methods, see Calling Synchronous Methods Asynchronously.

The declaration of a delegate type establishes a contract that specifies the signature of one or more methods. A delegate is an instance of a delegate type that has references to:

• An instance method of a type and a target object assignable to that type.

• An instance method of a type, with the hidden this parameter exposed in the formal parameter list. The delegate is said to be an open instance delegate.

• A static method.

• A static method and a target object assignable to the first parameter of the method. The delegate is said to be closed over its first argument.

For more information on delegate binding, see the CreateDelegate(Type, Object, MethodInfo, Boolean) method overload.

When a delegate represents an instance method closed over its first argument (the most common case), the delegate stores a reference to the method's entry point and a reference to an object, called the target, which is of a type assignable to the type that defined the method. When a delegate represents an open instance method, it stores a reference to the method's entry point. The delegate signature must include the hidden this parameter in its formal parameter list; in this case, the delegate does not have a reference to a target object, and a target object must be supplied when the delegate is invoked.

When a delegate represents a static method, the delegate stores a reference to the method's entry point. When a delegate represents a static method closed over its first argument, the delegate stores a reference to the method's entry point and a reference to a target object assignable to the type of the method's first argument. When the delegate is invoked, the first argument of the static method receives the target object. This first argument must be a reference type.

The invocation list of a delegate is an ordered set of delegates in which each element of the list invokes exactly one of the methods represented by the delegate. An invocation list can contain duplicate methods. During an invocation, methods are invoked in the order in which they appear in the invocation list. A delegate attempts to invoke every method in its invocation list; duplicates are invoked once for each time they appear in the invocation list. Delegates are immutable; once created, the invocation list of a delegate does not change.

Delegates are referred to as multicast, or combinable, because a delegate can invoke one or more methods and can be used in combining operations.

Combining operations, such as Combine and Remove, do not alter existing delegates. Instead, such an operation returns a new delegate that contains the results of the operation, an unchanged delegate, or null. A combining operation returns null when the result of the operation is a delegate that does not reference at least one method. A combining operation returns an unchanged delegate when the requested operation has no effect.

Starting with the .NET Framework 4, generic delegate types can have variant type parameters. Contravariant type parameters can be used as parameter types of the delegate, and a covariant type parameter can be used as the return type. This feature allows generic delegate types that are constructed from the same generic type definition to be assignment-compatible if their type arguments are reference types with an inheritance relationship, as explained in Covariance and Contravariance.

If an invoked method throws an exception, the method stops executing, the exception is passed back to the caller of the delegate, and remaining methods in the invocation list are not invoked. Catching the exception in the caller does not alter this behavior.

When the signature of the methods invoked by a delegate includes a return value, the delegate returns the return value of the last element in the invocation list. When the signature includes a parameter that is passed by reference, the final value of the parameter is the result of every method in the invocation list executing sequentially and updating the parameter's value.

The closest equivalent of a delegate in C is a function pointer. A delegate can represent a static method or an instance method. When the delegate represents an instance method, the delegate stores not only a reference to the method's entry point, but also a reference to the class instance. Unlike function pointers, delegates are object oriented and type safe.

For examples, see Supplemental API remarks for System.Delegate.CreateDelegate.

Constructors

Properties

Methods

Operators

Extension Methods

Applies to

See also

• MulticastDelegate
• Calling Synchronous Methods Asynchronously
• Delegates (C# Programming Guide)
• Delegates (Visual Basic)
• How to: Define and Use Delegates (C++/CLI)
• Handling and Raising Events