我有一个自定义对象类型,必须可以在其中进行编辑PropertyGrid
:
public class CustomObjectType
{
public string Name { get; set; }
public List<CustomProperty> Properties {get; set;}
}
其中有一个自定义属性列表:
public class CustomProperty
{
public string Name { get; set; }
public string Desc { get; set; }
public Object DefaultValue { get; set; }
Type type;
public Type Type
{
get
{
return type;
}
set
{
type = value;
DefaultValue = Activator.CreateInstance(value);
}
}
}
这里的主要问题是PropertyGrid
控件不允许编辑,也不使用适当的属性编辑工具DefaultValue
这是通过设置值预先实例化的CustomProperty
的场Type
.
Type of DefaultValue
仅在运行时才知道。
此外我需要提供一个定制的TypeConverter
for CustomProperty
的财产Type
显示支持类型的下拉列表(例如,Int
, String
, Color
, MyOwnClass
).
我该怎么做?
要走这条路,您需要创建一个自定义PropertyDescriptor
每项财产。然后您可以通过自定义公开它TypeConverter
,或者(或者)ICustomTypeDescriptor
/TypeDescriptionProvider
。例子:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
[TypeConverter(typeof(CustomObjectType.CustomObjectConverter))]
public class CustomObjectType
{
[Category("Standard")]
public string Name { get; set; }
private readonly List<CustomProperty> props = new List<CustomProperty>();
[Browsable(false)]
public List<CustomProperty> Properties { get { return props; } }
private Dictionary<string, object> values = new Dictionary<string, object>();
public object this[string name]
{
get { object val; values.TryGetValue(name, out val); return val; }
set { values.Remove(name); }
}
private class CustomObjectConverter : ExpandableObjectConverter
{
public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes)
{
var stdProps = base.GetProperties(context, value, attributes);
CustomObjectType obj = value as CustomObjectType;
List<CustomProperty> customProps = obj == null ? null : obj.Properties;
PropertyDescriptor[] props = new PropertyDescriptor[stdProps.Count + (customProps == null ? 0 : customProps.Count)];
stdProps.CopyTo(props, 0);
if (customProps != null)
{
int index = stdProps.Count;
foreach (CustomProperty prop in customProps)
{
props[index++] = new CustomPropertyDescriptor(prop);
}
}
return new PropertyDescriptorCollection(props);
}
}
private class CustomPropertyDescriptor : PropertyDescriptor
{
private readonly CustomProperty prop;
public CustomPropertyDescriptor(CustomProperty prop) : base(prop.Name, null)
{
this.prop = prop;
}
public override string Category { get { return "Dynamic"; } }
public override string Description { get { return prop.Desc; } }
public override string Name { get { return prop.Name; } }
public override bool ShouldSerializeValue(object component) { return ((CustomObjectType)component)[prop.Name] != null; }
public override void ResetValue(object component) { ((CustomObjectType)component)[prop.Name] = null; }
public override bool IsReadOnly { get { return false; } }
public override Type PropertyType { get { return prop.Type; } }
public override bool CanResetValue(object component) { return true; }
public override Type ComponentType { get { return typeof(CustomObjectType); } }
public override void SetValue(object component, object value) { ((CustomObjectType)component)[prop.Name] = value; }
public override object GetValue(object component) { return ((CustomObjectType)component)[prop.Name] ?? prop.DefaultValue; }
}
}
public class CustomProperty
{
public string Name { get; set; }
public string Desc { get; set; }
public object DefaultValue { get; set; }
Type type;
public Type Type
{
get
{
return type;
}
set
{
type = value;
DefaultValue = Activator.CreateInstance(value);
}
}
}
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
var obj = new CustomObjectType
{
Name = "Foo",
Properties =
{
new CustomProperty { Name = "Bar", Type = typeof(int), Desc = "I'm a bar"},
new CustomProperty { Name = "When", Type = typeof(DateTime), Desc = "When it happened"},
}
};
Application.Run(new Form { Controls = { new PropertyGrid { SelectedObject = obj, Dock = DockStyle.Fill } } });
}
}
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)