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Showing content from https://learn.microsoft.com/dotnet/api/system.action-5 below:

Action<T1,T2,T3,T4,T5> Delegate (System) | Microsoft Learn

Encapsulates a method that has five parameters and does not return a value.

generic <typename T1, typename T2, typename T3, typename T4, typename T5>
public delegate void Action(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5);

public delegate void Action<in T1,in T2,in T3,in T4,in T5>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5);

public delegate void Action<in T1,in T2,in T3,in T4,in T5>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5) where T1 : allows ref struct where T2 : allows ref struct where T3 : allows ref struct where T4 : allows ref struct where T5 : allows ref struct;

type Action<'T1, 'T2, 'T3, 'T4, 'T5> = delegate of 'T1 * 'T2 * 'T3 * 'T4 * 'T5 -> unit

Public Delegate Sub Action(Of In T1, In T2, In T3, In T4, In T5)(arg1 As T1, arg2 As T2, arg3 As T3, arg4 As T4, arg5 As T5)

T1

The type of the first parameter of the method that this delegate encapsulates.

This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see

.

T2

The type of the second parameter of the method that this delegate encapsulates.

This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see

.

T3

The type of the third parameter of the method that this delegate encapsulates.

This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see

.

T4

The type of the fourth parameter of the method that this delegate encapsulates.

This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see

.

T5

The type of the fifth parameter of the method that this delegate encapsulates.

This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see

.

arg1

T1

The first parameter of the method that this delegate encapsulates.

arg2

T2

The second parameter of the method that this delegate encapsulates.

arg3

T3

The third parameter of the method that this delegate encapsulates.

arg4

T4

The fourth parameter of the method that this delegate encapsulates.

arg5

T5

The fifth parameter of the method that this delegate encapsulates.

You can use the Action<T1,T2,T3,T4,T5> delegate to pass a method as a parameter without explicitly declaring a custom delegate. The encapsulated method must correspond to the method signature that is defined by this delegate. This means that the encapsulated method must have five parameters that are all passed to it by value, and it must not return a value. (In C#, the method must return void. In Visual Basic, it must be defined by the Sub…End Sub construct. It can also be a method that returns a value that is ignored.) Typically, such a method is used to perform an operation.

You can also use the Action<T1,T2,T3,T4,T5> delegate with anonymous methods and lambda expressions.

• Func<T1,T2,T3,T4,T5,TResult>

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