C＃ - 可以列表< MyClass>被无缝地转换为List< Interface>或类似？

我在我的控制中有一个 DataSource ，总是列表其中 T 必须继承 IEntity 。

I have a DataSource in my control which is always a List<T> where T has to inherit from IEntity.

public class MyClass<T> where T : IEntity
{
    public List<T> DataSource
    {
        get;
        set;
    }
}

现在， c $ c>列出< T> 至列表< IEntity> 执行以下操作：

Now, obviously you can't cast a List<T> to a List<IEntity> doing the following:

List<IEntity> wontWork = (List<IEntity>)this.DataSource;

如何获取DataSource作为 IEntity ，同时仍然能够从 DataSource 中添加和删除项目？也就是说我可以做以下，但从列表中删除它返回不会从DataSource中删除：

How can I get the DataSource as a List of IEntity, whilst still being able to add and remove items from the DataSource? I.e. I could do the following, but removing from the List it returns would not remove from the DataSource:

public List<TOut> GetDataSourceCopyAsUnderlyingType<TOut>()
{

    if (this.DataSource == null)
    {
        return new List<TOut>();
    }
    else
    {

        // Get the list and the enumerator
        IList list = (IList)this.DataSource;
        IEnumerator enumerator = list.GetEnumerator();

        // Build the target list
        List<TOut> targetList = new List<TOut>();

        int i = 0;
        while (enumerator.MoveNext())
        {
            TOut entity = (TOut)list[i];
            targetList.Add(entity);
            i++;
        }

        return targetList;

        }

    }

需要一些方法来执行以下操作：

Basically, I need some way of doing the following:

List<IEntity> interfaceList = this.GetDataSourceAsAnotherType<IEntity>();
int dataSourceCount = this.DataSource.Count;   // Equals 5
int interfaceCount = interfaceList.Count;      // Equals 5

interfaceList.RemoveAt(0);
int dataSourceCount = this.DataSource.Count;   // Equals 4
int interfaceCount = interfaceList.Count;      // Equals 4

只是为了添加，我不介意，使用不同的类型，而不是列表。

And just to add, I don't mind if it means I've got to use a different type instead of a List.

编辑：对不起，忘了说我使用.Net2.0，到.Net 3.5。

EDIT: Sorry, forgot to say I'm using .Net2.0 and cannot move to .Net 3.5.