WPF里关于继承基类

Question

namespace TwoToOnePokerGame
{
    /// <summary>
    /// Interaction logic for frmWinGame.xaml
    /// </summary>
    public partial class FormWinGame: DialogWindowBase
    {
        public FormWinGame()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, RoutedEventArgs e)
        {
            ((MainForm)ParentWindow).StartNewGame();
            this.Close();
        }        private void button2_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();
        }        public override string MessageStr
        {
            get
            {
                return base.MessageStr;
            }
            set
            {
                txtMessage.Text = value;
                base.MessageStr = value;
            }
        }
    }
}其中这个窗口名为FormWinGame，DialogWindowBase为一个类
提示“TwoToOnePokerGame.FormWinGame”的分部声明一定不能指定不同的基类

Answer 1

打开FormWinGame.xaml.cs
在class FormWinGame上右键——转到定义
选择转到FormWinGame.g.i.cs文件
把“FormWinGame : System.Windows.Window”改为"FormWinGame : DialogWindowBase"

Answer 2

改FormWinGame.xaml的第一行  <window... ></window>   为  
<DialogWindowBase....></DialogWindowBase> 
要加命名空间