System.Runtime by Microsoft

<PackageReference Include="System.Runtime" Version="4.0.21-beta-23409" />

 Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>

public sealed delegate Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> : MulticastDelegate
Encapsulates a method that has 11 parameters and does not return a value.
public Action(object object, IntPtr method)

public virtual IAsyncResult BeginInvoke(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, AsyncCallback callback, object object)

public virtual void EndInvoke(IAsyncResult result)

public virtual void Invoke(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11)