C#ImmutableList和ReadOnlyCollection的区别

            var intList = new List<int>() { 1 };

            var readOnlyList = new ReadOnlyCollection<int>(intList);
            var immutableList = intList.ToImmutableList();


            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("新增前--------------");
           
            Console.WriteLine("ReadOnlyCollection的数量:" + readOnlyList.Count);
            Console.WriteLine("ImmutableList的数量:" + immutableList.Count);

            intList.Add(2);

            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine("新增后--------------");
            
            Console.WriteLine("ReadOnlyCollection的数量:" + readOnlyList.Count);
            Console.WriteLine("ImmutableList的数量:" + immutableList.Count);

总结

ReadOnlyCollection只是对原对象的包装。修改原对象还是会影响当前对象。所以不是线程安全的
ImmutableList则是真正不可变的。是线程安全的