C# PropertyGrid使用案例详解

  1. 只有public的property能显示出来,可以通过BrowsableAttribute来控制是否显示,通过CategoryAttribute设置分类,通过DescriptionAttribute设置描述,Attribute可以加在Class上,也可以加在属性上,属性上的Attribute优先级更高;

  2. enum会自动使用列表框表示;

  3. 自带输入有效性检查,如int类型输入double数值,会弹出提示对话框;

  4. 基本类型Array:增加删除只能通过弹出的集合编辑器,修改可以直接展开,值为null时,可以通过集合编辑器创建;

  5. 基本类型List:增删改都只能通过集合编辑器,值为null时,能打开集合编辑器,但不能保存结果,所以必须初始化;

  6. ReadOnlyAttribute设置为true时,显示为灰色;对List无效,可以打开集合编辑器,在集合编辑器内可以进行增删改;应用于Array时,不能打开集合编辑器,即不能增删,但可以通过展开的方式修改Array元素;

  7. 对象:值显示Object.ToString();Class上加了[TypeConverter(typeof(ExpandableObjectConverter))]之后(也可以加在属性上),才能展开编辑,否则显示为灰色只读;不初始化什么也干不了;

  8. 基类类型派生类对象:与普通对象没有区别,[TypeConverter(typeof(ExpandableObjectConverter))]加在基类上即可;

  9. 对象Array:增加删除只能通过弹出的集合编辑器,修改可以直接展开,值为null时,可以通过集合编辑器创建;

  10. 对象List:增加删除修改只能通过弹出的集合编辑器,值为null时,能打开集合编辑器,但不能保存结果,所以必须初始化;

  11. Hashtable和Dictionary能打开集合编辑器,但不能编辑;

  12. 通过MyDoubleConverter实现Double类型只显示小数点后两位:

  public class MyDoubleConverter : DoubleConverter

  {

  public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)

  {

  if (destinationType == typeof(string))

  {

  return string.Format("{0:0.00}", value);

  }

  return base.ConvertTo(context, culture, value, destinationType);

  }

  }

  13. 通过TypeConverter实现用字符串表示对象

  [TypeConverter(typeof(StudentConverter))]

  public class Student

  {

  public Student(string name, int age)

  {

  Name = name;

  Age = age;

  }

  public string Name { get; set; }

  public int Age { get; set; }

  public static Student FromString(string s)

  {

  string name = "Default";

  int age = 0;

  string[] splits = s.Split(',');

  if (splits.Length == 2)

  {

  name = splits[0];

  int.TryParse(splits[1], out age);

  }

  return new Student(name, age);

  }

  public override string ToString()

  {

  return string.Format("{0},{1}", Name, Age);

  }

  }

  public class StudentConverter : TypeConverter

  {

  public override bool CanConvertFrom(System.ComponentModel.ITypeDescriptorContext context, Type sourceType)

  {

  if (sourceType == typeof(string))

  {

  return true;

  }

  return base.CanConvertFrom(context, sourceType);

  }

  public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)

  {

  Student result = null;

  if ((value as string) != null)

  {

  result = Student.FromString(value as string);

  }

  return result;

  }

  public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)

  {

  if (destinationType == typeof(string))

  {

  return true;

  }

  return base.CanConvertTo(context, destinationType);

  }

  public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)

  {

  if (destinationType == typeof(string))

  {

  return value.ToString();

  }

  return base.ConvertTo(context, culture, value, destinationType);

  }

  }

  14. 使用UITypeEditor实现文件或目录选择

  // 需要在项目里添加引用:程序集|框架|System.Design

  [Editor(typeof(FileNameEditor), typeof(UITypeEditor))]

  public string FileName { get; set; }

  [Editor(typeof(FolderNameEditor), typeof(UITypeEditor))]

  public string FolderName { get; set; }

  15. 使用自定义的下拉式编辑界面

  public class MyAddress

  {

  public string Province { get; set; }

  public string City { get; set; }

  public override string ToString()

  {

  return string.Format("{0}-{1}", Province, City);

  }

  }

  public class MyAddressEditor : UITypeEditor

  {

  public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)

  {

  return UITypeEditorEditStyle.DropDown;

  }

  public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)

  {

  IWindowsFormsEditorService service = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;

  if (service != null)

  {

  service.DropDownControl(new MyEditorControl(value as MyAddress));

  }

  return value;

  }

  }

  // 实现两个ComboBox用来编辑MyAddress的属性

  public partial class MyEditorControl : UserControl

  {

  private MyAddress _address;

  public MyEditorControl(MyAddress address)

  {

  InitializeComponent();

  _address = address;

  comboBoxProvince.Text = _address.Province;

  comboBoxCity.Text = _address.City;

  }

  private void comboBoxProvince_SelectedIndexChanged(object sender, EventArgs e)

  {

  _address.Province = comboBoxProvince.Text;

  }

  private void comboBoxCity_SelectedIndexChanged(object sender, EventArgs e)

  {

  _address.City = comboBoxCity.Text;

  }

  }

  // MyAddress属性声明

  [Editor(typeof(MyAddressEditor), typeof(UITypeEditor))]

  public MyAddress Address { get; set; }

  效果如图:

  16. 实现弹出式编辑对话框,只要将UserControl改成Form,EditStyle改成Modal,service.DropDownControl改成service.ShowDialog

  public partial class MyEditorForm : Form

  {

  private MyAddress _address;

  public MyEditorForm(MyAddress address)

  {

  InitializeComponent();

  _address = address;

  comboBoxProvince.Text = _address.Province;

  comboBoxCity.Text = _address.City;

  }

  private void comboBoxProvince_SelectedIndexChanged(object sender, EventArgs e)

  {

  _address.Province = comboBoxProvince.Text;

  }

  private void comboBoxCity_SelectedIndexChanged(object sender, EventArgs e)

  {

  _address.City = comboBoxCity.Text;

  }

  }

  public class MyAddressEditor : UITypeEditor

  {

  public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)

  {

  return UITypeEditorEditStyle.Modal;

  }

  public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)

  {

  IWindowsFormsEditorService service = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;

  if (service != null)

  {

  service.ShowDialog(new MyEditorForm(value as MyAddress));

  }

  return value;

  }

  }

  17. 密码表示:[PasswordPropertyText(true)]

  18. 动态显示/隐藏属性

  class MyData

  {

  public static void SetPropertyAttribute(object obj, string propertyName, Type attrType, string attrField, object value)

  {

  PropertyDescriptorCollection props = TypeDescriptor.GetProperties(obj);

  Attribute attr = props[propertyName].Attributes[attrType];

  FieldInfo field = attrType.GetField(attrField, BindingFlags.Instance | BindingFlags.NonPublic);

  field.SetValue(attr, value);

  }

  private bool _ShowPassword = false;

  public bool ShowPassword

  {

  get { return _ShowPassword; }

  set

  {

  _ShowPassword = value;

  SetPropertyAttribute(this, "Password", typeof(BrowsableAttribute), "browsable", _ShowPassword);

  }

  }

  [PasswordPropertyText(true)]

  [Browsable(true)]

  public string Password { get; set; }

  }

  public partial class MainFrm : Form

  {

  // 不添加PropertyValueChanged事件,不能实现动态显示/隐藏

  private void myData_PropertyValueChanged(object s, PropertyValueChangedEventArgs e)

  {

  this.myData.SelectedObject = this.myData.SelectedObject;

  }

  }

  19. 提供下拉选项的string

  public class ListStringConverter : StringConverter

  {

  public override bool GetStandardValuesSupported(ITypeDescriptorContext context)

  {

  return true;

  }

  public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)

  {

  return new StandardValuesCollection(new string[] { "A", "B" });

  }

  public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)

  {

  return false;

  }

  }

  [TypeConverter(typeof(ListStringConverter))]

  public string Name { get; set; }

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