閱讀英文 編輯

共用方式為


Action<T1,T2,T3,T4,T5,T6,T7,T8> Delegate

Definition

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

public delegate void Action<in T1,in T2,in T3,in T4,in T5,in T6,in T7,in T8>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8);

Type Parameters

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 Covariance and Contravariance in Generics.
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 Covariance and Contravariance in Generics.
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 Covariance and Contravariance in Generics.
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 Covariance and Contravariance in Generics.
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 Covariance and Contravariance in Generics.
T6

The type of the sixth 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 Covariance and Contravariance in Generics.
T7

The type of the seventh 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 Covariance and Contravariance in Generics.
T8

The type of the eighth 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 Covariance and Contravariance in Generics.

Parameters

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.

arg6
T6

The sixth parameter of the method that this delegate encapsulates.

arg7
T7

The seventh parameter of the method that this delegate encapsulates.

arg8
T8

The eighth parameter of the method that this delegate encapsulates.

Remarks

You can use the Action<T1,T2,T3,T4,T5,T6,T7,T8> 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 eight 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 SubEnd 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.

注意

To reference a method that has eight parameters and returns a value, use the generic Func<T1,T2,T3,T4,T5,T6,T7,T8,TResult> delegate instead.

You can also use the Action<T1,T2,T3,T4,T5,T6,T7,T8> delegate with anonymous methods and lambda expressions.

Extension Methods

GetMethodInfo(Delegate)

Gets an object that represents the method represented by the specified delegate.

Applies to

產品 版本
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

See also