用于数据输入的基本WPF窗口功能

CheckedTextBox从TextBox继承，添加ICheck功能（请参见下面的说明）和IsRequired属性。当设置为true时，用户必须在“保存”按钮可用之前提供一个值（即Text.Length>0）：

using System.Windows;
using WpfWindowsLib;

namespace Samples {
  public partial class SampleWindow: CheckedWindow {
    public SampleWindow() {
      InitializeComponent();

      //write some code here to display data coming from a database, etc.
      TestCheckedTextBox.Text = database.Read(...);
      SaveButton.Click += saveButton_Click;
      updateSaveButtonIsEnabled();
    }

    private void saveButton_Click(object sender, RoutedEventArgs e) {
      //write some code here to save the data the user has entered
      database.Write(..., TestCheckedTextBox.Text);
      Close();
    }

    private void updateSaveButtonIsEnabled() {
      SaveButton.IsEnabled = HasICheckChanged && IsAvailable;
    }

    protected override void OnICheckChanged() {
      updateSaveButtonIsEnabled();
    }

    protected override void OnIsAvailableChanged() {
      updateSaveButtonIsEnabled();
    }
  }
}

只需要很少的代码就可以添加到该窗口：

namespace WpfWindowsLib {

  public interface ICheck {

    /// 
    /// Has the user changed the initial value of the control ?
    /// 
    bool HasChanged { get; }

    /// 
    /// Needs the user to change the initial value of the control ?
    /// 
    bool IsRequired { get; }

    /// 
    /// Has the user changed the initial value of the required control ?
    /// 
    bool IsAvailable { get; }

    /// 
    /// Raised when the user changes the initial value of the control 
    /// or when the user undoes any change and
    /// enters the initial value again.
    /// 
    event Action  HasChangedEvent;

    /// 
    /// Raised when the user changes the initial value of the required value control 
    /// or when the user undoes 
    /// any change and enters the initial value again.
    /// 
    event Action  IsAvailableEvent;

    /// 
    /// Tells the control to use the present value as initial value.
    /// 
    void ResetHasChanged();

    /// 
    /// Changes the background color of the control if its value is now 
    /// different than the initial value 
    /// and isChanged is true. If isChanged is false, the background color 
    /// gets displayed from when the
    /// control got initialised.
    /// 
    /// 
    void ShowChanged(bool isChanged);
  }
}