CSHARP

action delegate c#

  private void ShowContentThreadSafe(int level)
  {
            
      if (UcView.TreeList.InvokeRequired)
       {
          	UcView.TreeList?.Invoke(new Action1<int>(a => ShowContent(level)));
       }
       else
        	ShowContent(level);
            
   }

action c#

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

public class ActionDemo : MonoBehaviour {

	void Start(){
		Action<string> SampleAction; //action dont need an explicit delegate to be declared (Action is special kind of delegate which takes parameters but returns nothing)

		SampleAction = PrintMsg;
		SampleAction += delegate(string s) {Debug.Log("from anonymous method : "+s);} ; //using anonymous method
		SampleAction += s => Debug.Log("using lambda expression : "+s); //using lambda expression
		SampleAction ("Hello shrinath");
	}

	void PrintMsg(string msg1){
		Debug.Log ("msg : " + msg1);
	}
}

C# Action Delegate

//one of three built-in generic delegate types:

static void ConsolePrint(int i)
{
    Console.WriteLine(i);
}

static void Main(string[] args)
{
    Action<int> printActionDel = ConsolePrint;
    printActionDel(10);
}