c# - protected 成员对用户可见

这将是我的第一个问题，因此请宽容。

这怎么可能:

//there is a Form1 class which has a TableAdapter member generated by designer...
partial class Form1
{
    private void InitializeComponent()
    {
         this.SomeTableTableAdapter = new SomeDatabaseDataSetTableAdapters.SomeTableTableAdapter();
    }

    private SomeDatabaseDataSetTableAdapters.SomeTableTableAdapter SomeTableTableAdapter;
 }

//here is this TableAdapter class
//It has PROTECTED member called "Adapter"
public partial class SomeTableTableAdapter : global::System.ComponentModel.Component
{
    protected internal global::System.Data.SqlClient.SqlDataAdapter Adapter
    {
    }
}

//and in the constructor of Form1 class I can do something like this:
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.SomeTableTableAdapter.Adapter.InsertCommand.CommandText = @"INSERT INTO (...)";
    }
}

由于Form1不继承自SomeTableTableAdapter，我如何获得对 protected 成员的访问权限？

最佳答案

Adapter属性声明为protected internal，这意味着派生类(protected)和可以访问同一程序集(internal)中的类。由于Form1与SomeTableTableAdapter在同一程序集中，因此它们可以访问彼此的内部成员。