List

内部元素为引用

src[0]为"11"

List<Source> src = new List<Source>();
src.Add(new Source() { Name = "1", Age = 1, Description = "1" });
src.Add(new Source() { Name = "2", Age = 2, Description = "2" });
foreach (var source in src)
{
    source.Name = "11";
}

Console.WriteLine(src[0].Name);

内部元素非引用

不能赋值，会报错