问一个List<>的基础问题
private void Process(List<string> list1,out List<string> list1_out)
{
list1_out = list1;

for (int i = 0; i + 1 < list1.Count; i++)
{

if (某个条件)
{
list1_out.RemoveAt(i);
}
}

}

原本以为是仅去除list1_out内的值，谁知list1内的也一样被remove了

请问该怎么写才能保证list1内的东西没被remove，仅remove "list1_out"内的，谢谢

[解决办法]

C# code

private void Process<T>(List <T>  list1,out List <T>  list1_out) {     list1_out = new List<T>(list1);     for (int i = 0; i + 1  < list1.Count; i++)             {                 if (true/*某个条件*/)                 {                     list1_out.RemoveAt(i);                 }             } }