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Reference
System
Action Delegate
Action(T) Delegate
Action(T1, T2) Delegate
Action(T1, T2, T3) Delegate
Action(T1, T2, T3, T4) Delegate
Action(T1, T2, T3, T4, T5) Delegate
Action(T1, T2, T3, T4, T5, T6) Delegate
Action(T1, T2, T3, T4, T5, T6, T7) Delegate
Action(T1, T2, T3, T4, T5, T6, T7, T8) Delegate
Activator Class
ArgumentException Class
ArgumentNullException Class
Array Class
Attribute Class
BitConverter Class
Boolean Structure
Buffer Class
Byte Structure
Char Structure
Console Class
Convert Class
DateTime Structure
Decimal Structure
Delegate Class
Double Structure
Enum Class
Environment Class
EventArgs Class
EventHandler Delegate
EventHandler(TEventArgs) Delegate
Exception Class
FormatException Class
Func(TResult) Delegate
Func(T, TResult) Delegate
Func(T1, T2, TResult) Delegate
Func(T1, T2, T3, TResult) Delegate
Func(T1, T2, T3, T4, TResult) Delegate
Func(T1, T2, T3, T4, T5, TResult) Delegate
Func(T1, T2, T3, T4, T5, T6, TResult) Delegate
Func(T1, T2, T3, T4, T5, T6, T7, TResult) Delegate
Func(T1, T2, T3, T4, T5, T6, T7, T8, TResult) Delegate
GC Class
Guid Structure
IDisposable Interface
Int16 Structure
Int32 Structure
Int64 Structure
INTERNAL_WebRequestHelper Class
IntPtr Structure
InvalidCastException Class
InvalidOperationException Class
Math Class
MulticastDelegate Class
NotImplementedException Class
NotSupportedException Class
Nullable Class
Nullable(T) Structure
Object Class
Predicate(T) Delegate
Random Class
SByte Structure
Single Structure
String Class
SystemException Class
TimeSpan Structure
Tuple2 Class
Tuple2(T1, T2) Class
Tuple2(T1, T2, T3) Class
Tuple2(T1, T2, T3, T4) Class
Type Class
UInt16 Structure
UInt32 Structure
UInt64 Structure
UIntPtr Structure
Uri Class
UriKind Enumeration
WeakReference Class
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ActionT1, T2, T3, T4 Delegate
Encapsulates a method that has four parameters and does not return a value.

Namespace: System
Assembly: mscorlib (in mscorlib.dll) Version: 4.0.0.0
Syntax
C#
Copy
public delegate void Action<in T1, in T2, in T3, in T4>(
	T1 arg1,
	T2 arg2,
	T3 arg3,
	T4 arg4
)

Parameters

arg1
Type: T1
The first parameter of the method that this delegate encapsulates.
arg2
Type: T2
The second parameter of the method that this delegate encapsulates.
arg3
Type: T3
The third parameter of the method that this delegate encapsulates.
arg4
Type: T4
The fourth parameter of the method that this delegate encapsulates.

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.
T3
The type of the third parameter of the method that this delegate encapsulates.
T4
The type of the fourth parameter of the method that this delegate encapsulates.
See Also