Class DelegateHelpers

Represents various extensions of delegates.

Inheritance

Object

DelegateHelpers

Inherited Members

Object.Equals(Object)

Object.Equals(Object, Object)

Object.GetHashCode()

Object.GetType()

Object.MemberwiseClone()

Object.ReferenceEquals(Object, Object)

Object.ToString()

Namespace: DotNext

Assembly: DotNext.dll

Syntax

[BeforeFieldInit(true)]
public static class DelegateHelpers

Methods

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Bind<T>(Action<T>, T)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Action Bind<T>(this Action<T> action, T obj)

    where T : class

Parameters

Type	Name	Description
Action<T>	action	The action to bind.
T	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Action	The delegate targeting the specified object.

Type Parameters

Name	Description
T	The type of the first parameter to bind.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2>(Action<T1, T2>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Action<T2> Bind<T1, T2>(this Action<T1, T2> action, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Action<T1, T2>	action	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Action<T2>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T, TResult>(Func<T, TResult>, T)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Func<TResult> Bind<T, TResult>(this Func<T, TResult> func, T obj)

    where T : class

Parameters

Type	Name	Description
Func<T, TResult>	func	The action to bind.
T	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Func<TResult>	The delegate targeting the specified object.

Type Parameters

Name	Description
T	The type of the first parameter to bind.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2, T3>(Action<T1, T2, T3>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Action<T2, T3> Bind<T1, T2, T3>(this Action<T1, T2, T3> action, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Action<T1, T2, T3>	action	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Action<T2, T3>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.
T3	The type of the third parameter.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2, TResult>(Func<T1, T2, TResult>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Func<T2, TResult> Bind<T1, T2, TResult>(this Func<T1, T2, TResult> func, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Func<T1, T2, TResult>	func	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Func<T2, TResult>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2, T3, T4>(Action<T1, T2, T3, T4>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Action<T2, T3, T4> Bind<T1, T2, T3, T4>(this Action<T1, T2, T3, T4> action, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Action<T1, T2, T3, T4>	action	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Action<T2, T3, T4>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.
T3	The type of the third parameter.
T4	The type of the fourth parameter.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2, T3, TResult>(Func<T1, T2, T3, TResult>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Func<T2, T3, TResult> Bind<T1, T2, T3, TResult>(this Func<T1, T2, T3, TResult> func, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Func<T1, T2, T3, TResult>	func	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Func<T2, T3, TResult>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.
T3	The type of the third parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2, T3, T4, T5>(Action<T1, T2, T3, T4, T5>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Action<T2, T3, T4, T5> Bind<T1, T2, T3, T4, T5>(this Action<T1, T2, T3, T4, T5> action, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Action<T1, T2, T3, T4, T5>	action	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Action<T2, T3, T4, T5>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.
T3	The type of the third parameter.
T4	The type of the fourth parameter.
T5	The type of the fifth parameter.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2, T3, T4, TResult>(Func<T1, T2, T3, T4, TResult>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Func<T2, T3, T4, TResult> Bind<T1, T2, T3, T4, TResult>(this Func<T1, T2, T3, T4, TResult> func, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Func<T1, T2, T3, T4, TResult>	func	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Func<T2, T3, T4, TResult>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.
T3	The type of the third parameter.
T4	The type of the fourth parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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Bind<T1, T2, T3, T4, T5, TResult>(Func<T1, T2, T3, T4, T5, TResult>, T1)

Produces delegate which first parameter is implicitly bound to the given object.

Declaration

public static Func<T2, T3, T4, T5, TResult> Bind<T1, T2, T3, T4, T5, TResult>(this Func<T1, T2, T3, T4, T5, TResult> func, T1 obj)

    where T1 : class

Parameters

Type	Name	Description
Func<T1, T2, T3, T4, T5, TResult>	func	The action to bind.
T1	obj	The object to be passed implicitly as the first argument into the method represented by this pointer. Cannot be null.

Returns

Type	Description
Func<T2, T3, T4, T5, TResult>	The delegate targeting the specified object.

Type Parameters

Name	Description
T1	The type of the first parameter to bind.
T2	The type of the second parameter.
T3	The type of the third parameter.
T4	The type of the fourth parameter.
T5	The type of the fifth parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
ArgumentNullException	`obj` is null.

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ChangeType<TDelegate>(Delegate)

Returns a new delegate of different type which points to the same method as original delegate.

Declaration

public static TDelegate ChangeType<TDelegate>(this Delegate d)

    where TDelegate : Delegate

Parameters

Type	Name	Description
Delegate	d	Delegate to convert.

Returns

Type	Description
TDelegate	A method wrapped into new delegate type.

Type Parameters

Name	Description
TDelegate	A new delegate type.

Exceptions

Type	Condition
ArgumentException	Cannot convert delegate type.

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Contravariant<TBase, T>(EventHandler<TBase>)

Performs contravariant conversion of actual generic argument specified for EventHandler<TEventArgs> type.

Declaration

public static EventHandler<T> Contravariant<TBase, T>(this EventHandler<TBase> handler)

    where TBase : class where T : class, TBase

Parameters

Type	Name	Description
EventHandler<TBase>	handler	The handler to convert.

Returns

Type	Description
EventHandler<T>	The delegate referencing the same method as original delegate.

Type Parameters

Name	Description
TBase	Input type of the delegate.
T	A subtype of `TBase`.

Remarks

Generic parameter of delegate EventHandler<TEventArgs> is not marked as langword_csharp_in so compiler doesn't support contravariant conversion for it. This method provides contravariant conversion for this delegate type.

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CreateClosedDelegateFactory<TDelegate>(Expression<TDelegate>)

Creates a factory for closed delegates.

Declaration

public static Func<object, TDelegate> CreateClosedDelegateFactory<TDelegate>(Expression<TDelegate> expression)

    where TDelegate : Delegate

Parameters

Type	Name	Description
Expression<TDelegate>	expression	The expression tree containing instance method, property, operator call.

Returns

Type	Description
Func<Object, TDelegate>	The factory of closed delegate.

Type Parameters

Name	Description
TDelegate	The type of the delegate describing expression tree.

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CreateDelegate<TDelegate>(MethodInfo, Object)

Creates a delegate of the specified type with the specified target from this method.

Declaration

public static TDelegate CreateDelegate<TDelegate>(this MethodInfo method, object target = null)

    where TDelegate : Delegate

Parameters

Type	Name	Description
MethodInfo	method	The method to be wrapped into delegate.
Object	target	The object targeted by the delegate.

Returns

Type	Description
TDelegate	The delegate for the specified method.

Type Parameters

Name	Description
TDelegate	The type of the delegate to create.

CreateOpenDelegate<TDelegate>(Expression<TDelegate>)

Creates open delegate for the instance method, property, operator referenced in expression tree.

Declaration

public static TDelegate CreateOpenDelegate<TDelegate>(Expression<TDelegate> expression)

    where TDelegate : Delegate

Parameters

Type	Name	Description
Expression<TDelegate>	expression	The expression tree containing instance method call.

Returns

Type	Description
TDelegate	The open delegate.

Type Parameters

Name	Description
TDelegate	The type of the delegate describing expression tree.

Exceptions

Type	Condition
ArgumentException	`expression` is not valid expression tree.

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CreateOpenDelegate<T, TValue>(Expression<Func<T, TValue>>)

Creates open delegate for instance property setter.

Declaration

public static Action<T, TValue> CreateOpenDelegate<T, TValue>(Expression<Func<T, TValue>> properyExpr)

    where T : class

Parameters

Type	Name	Description
Expression<Func<T, TValue>>	properyExpr	The expression representing property.

Returns

Type	Description
Action<T, TValue>	The open delegate representing property setter.

Type Parameters

Name	Description
T	The declaring type.
TValue	The type of property value.

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Unbind<T>(Action)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Action<T> Unbind<T>(this Action action)

    where T : class

Parameters

Type	Name	Description
Action	action	The delegate to unbind.

Returns

Type	Description
Action<T>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.

Exceptions

Type	Condition
InvalidOperationException	Target of `action` is not contravarient to type `T`.

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Unbind<T, TArg>(Action<TArg>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Action<T, TArg> Unbind<T, TArg>(this Action<TArg> action)

    where T : class

Parameters

Type	Name	Description
Action<TArg>	action	The delegate to unbind.

Returns

Type	Description
Action<T, TArg>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
TArg	The type of the first explicit parameter.

Exceptions

Type	Condition
InvalidOperationException	Target of `action` is not contravarient to type `T`.

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Unbind<T, TResult>(Func<TResult>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Func<T, TResult> Unbind<T, TResult>(this Func<TResult> func)

    where T : class

Parameters

Type	Name	Description
Func<TResult>	func	The delegate to unbind.

Returns

Type	Description
Func<T, TResult>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
InvalidOperationException	Target of `func` is not contravarient to type `T`.

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Unbind<T, T1, T2>(Action<T1, T2>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Action<T, T1, T2> Unbind<T, T1, T2>(this Action<T1, T2> action)

    where T : class

Parameters

Type	Name	Description
Action<T1, T2>	action	The delegate to unbind.

Returns

Type	Description
Action<T, T1, T2>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.

Exceptions

Type	Condition
InvalidOperationException	Target of `action` is not contravarient to type `T`.

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Unbind<T, TArg, TResult>(Func<TArg, TResult>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Func<T, TArg, TResult> Unbind<T, TArg, TResult>(this Func<TArg, TResult> func)

    where T : class

Parameters

Type	Name	Description
Func<TArg, TResult>	func	The delegate to unbind.

Returns

Type	Description
Func<T, TArg, TResult>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
TArg	The type of the first explicit parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
InvalidOperationException	Target of `func` is not contravarient to type `T`.

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Unbind<T, T1, T2, T3>(Action<T1, T2, T3>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Action<T, T1, T2, T3> Unbind<T, T1, T2, T3>(this Action<T1, T2, T3> action)

    where T : class

Parameters

Type	Name	Description
Action<T1, T2, T3>	action	The delegate to unbind.

Returns

Type	Description
Action<T, T1, T2, T3>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.
T3	The type of the third explicit parameter.

Exceptions

Type	Condition
InvalidOperationException	Target of `action` is not contravarient to type `T`.

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Unbind<T, T1, T2, TResult>(Func<T1, T2, TResult>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Func<T, T1, T2, TResult> Unbind<T, T1, T2, TResult>(this Func<T1, T2, TResult> func)

    where T : class

Parameters

Type	Name	Description
Func<T1, T2, TResult>	func	The delegate to unbind.

Returns

Type	Description
Func<T, T1, T2, TResult>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
InvalidOperationException	Target of `func` is not contravarient to type `T`.

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Unbind<T, T1, T2, T3, T4>(Action<T1, T2, T3, T4>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Action<T, T1, T2, T3, T4> Unbind<T, T1, T2, T3, T4>(this Action<T1, T2, T3, T4> action)

    where T : class

Parameters

Type	Name	Description
Action<T1, T2, T3, T4>	action	The delegate to unbind.

Returns

Type	Description
Action<T, T1, T2, T3, T4>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.
T3	The type of the third explicit parameter.
T4	The type of the fourth explicit parameter.

Exceptions

Type	Condition
InvalidOperationException	Target of `action` is not contravarient to type `T`.

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Unbind<T, T1, T2, T3, TResult>(Func<T1, T2, T3, TResult>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Func<T, T1, T2, T3, TResult> Unbind<T, T1, T2, T3, TResult>(this Func<T1, T2, T3, TResult> func)

    where T : class

Parameters

Type	Name	Description
Func<T1, T2, T3, TResult>	func	The delegate to unbind.

Returns

Type	Description
Func<T, T1, T2, T3, TResult>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.
T3	The type of the third explicit parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
InvalidOperationException	Target of `func` is not contravarient to type `T`.

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Unbind<T, T1, T2, T3, T4, T5>(Action<T1, T2, T3, T4, T5>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Action<T, T1, T2, T3, T4, T5> Unbind<T, T1, T2, T3, T4, T5>(this Action<T1, T2, T3, T4, T5> action)

    where T : class

Parameters

Type	Name	Description
Action<T1, T2, T3, T4, T5>	action	The delegate to unbind.

Returns

Type	Description
Action<T, T1, T2, T3, T4, T5>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.
T3	The type of the third explicit parameter.
T4	The type of the fourth explicit parameter.
T5	The type of the fifth explicit parameter.

Exceptions

Type	Condition
InvalidOperationException	Target of `action` is not contravarient to type `T`.

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Unbind<T, T1, T2, T3, T4, TResult>(Func<T1, T2, T3, T4, TResult>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Func<T, T1, T2, T3, T4, TResult> Unbind<T, T1, T2, T3, T4, TResult>(this Func<T1, T2, T3, T4, TResult> func)

    where T : class

Parameters

Type	Name	Description
Func<T1, T2, T3, T4, TResult>	func	The delegate to unbind.

Returns

Type	Description
Func<T, T1, T2, T3, T4, TResult>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.
T3	The type of the third explicit parameter.
T4	The type of the fourth explicit parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
InvalidOperationException	Target of `func` is not contravarient to type `T`.

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Unbind<T, T1, T2, T3, T4, T5, TResult>(Func<T1, T2, T3, T4, T5, TResult>)

Converts implicitly bound delegate into its unbound version.

Declaration

public static Func<T, T1, T2, T3, T4, T5, TResult> Unbind<T, T1, T2, T3, T4, T5, TResult>(this Func<T1, T2, T3, T4, T5, TResult> func)

    where T : class

Parameters

Type	Name	Description
Func<T1, T2, T3, T4, T5, TResult>	func	The delegate to unbind.

Returns

Type	Description
Func<T, T1, T2, T3, T4, T5, TResult>	Unbound version of the delegate.

Type Parameters

Name	Description
T	The expected type of Target.
T1	The type of the first explicit parameter.
T2	The type of the second explicit parameter.
T3	The type of the third explicit parameter.
T4	The type of the fourth explicit parameter.
T5	The type of the fifth explicit parameter.
TResult	The type of the return value of the method that the delegate encapsulates.

Exceptions

Type	Condition
InvalidOperationException	Target of `func` is not contravarient to type `T`.