C# int與char或string拼接

using UnityEngine;
public class Test: MonoBehaviour{
    private void Start (){
		Debug.Log(',');//output:,
		Debug.Log(1+',');//output:45

		int intValue1=1+',';
		Debug.Log(intValue1);//output:45
		//int intValue2=1+",";//無法將類型"string"隱式轉換為"int"

		//string str1=1+',';//無法將類型"int"隱式轉換為"string"
		string str2=1+",";
		Debug.Log(str2);//output:1,
    }
}