C#|C# PropertyGrid使用案例详解 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：

文章图片

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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