C# 如果要实现自定义属性必须要需要实现接口ICustomTypeDescriptor
// 摘要:
// 提供为对象提供动态自定义类型信息的接口。
public interface ICustomTypeDescriptor
例子:
/// <summary>
/// 自定义属性对象
/// </summary>
public class MyAttr
{
private string name = string.Empty; public string Name
{
get { return name; }
set { name = value; }
}
private object value = null; public object Value
{
get { return this.value; }
set { this.value = value; }
} private string description = string.Empty; public string Description
{
get { return description; }
set { description = value; }
} public override string ToString()
{
return string.Format("Name:{0},Value:{1}",name.ToString(),value.ToString());
}
} /// <summary>
/// 自定义性质描述类
/// </summary>
public class MyPropertyDescription : PropertyDescriptor
{
private MyAttr myattr = null;
public MyPropertyDescription(MyAttr myattr, Attribute[] attrs): base(myattr.Name, attrs)
{
this.myattr = myattr;
}
public override bool CanResetValue(object component)
{
return false;
} public override Type ComponentType
{
get
{
return this.GetType();
}
} public override object GetValue(object component)
{
return myattr.Value;
} public override bool IsReadOnly
{
get
{
return false;
}
} public override Type PropertyType
{
get
{
return myattr.Value.GetType();
}
} public override void ResetValue(object component)
{
//不重置，无动作
} public override void SetValue(object component, object value)
{
myattr.Value = value;
}
/// <summary>
/// 是否应该持久化保存
/// </summary>
/// <param name="component"></param>
/// <returns></returns>
public override bool ShouldSerializeValue(object component)
{
return false;
}
/// <summary>
/// 属性说明
/// </summary>
public override string Description
{
get
{
return myattr.Description;
}
}
} /// <summary>
/// 实现自定义的特殊属性对象必须继承ICustomTypeDescriptor,并实现Dictionary
/// </summary>
public class MyAttrCollection : Dictionary<String, MyAttr>, ICustomTypeDescriptor
{
/// <summary>
/// 重写Add方法
/// </summary>
/// <param name="attr"></param>
public void Add(MyAttr attr)
{
if (!this.ContainsKey(attr.Name))
{
base.Add(attr.Name, attr);
}
} public AttributeCollection GetAttributes()
{
return TypeDescriptor.GetAttributes(this, true);
} public string GetClassName()
{
return TypeDescriptor.GetClassName(this,true);
} public string GetComponentName()
{
return TypeDescriptor.GetClassName(this, true);
} public TypeConverter GetConverter()
{
return TypeDescriptor.GetConverter(this, true);
} public EventDescriptor GetDefaultEvent()
{
return TypeDescriptor.GetDefaultEvent(this, true);
} public PropertyDescriptor GetDefaultProperty()
{
return TypeDescriptor.GetDefaultProperty(this, true);
} public object GetEditor(Type editorBaseType)
{
return TypeDescriptor.GetEditor(this, editorBaseType, true);
} public EventDescriptorCollection GetEvents(Attribute[] attributes)
{
return TypeDescriptor.GetEvents(this, attributes, true);
} public EventDescriptorCollection GetEvents()
{
return TypeDescriptor.GetEvents(this, true);
} public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
{
int count=this.Values.Count;
PropertyDescriptor[] pds=new PropertyDescriptor[count];
int index = ;
foreach (MyAttr item in this.Values)
{
pds[index] = new MyPropertyDescription(item,attributes);
index++;
}
return new PropertyDescriptorCollection(pds);
} public PropertyDescriptorCollection GetProperties()
{
return TypeDescriptor.GetProperties(this,true);
} public object GetPropertyOwner(PropertyDescriptor pd)
{
return this;
}
}
前台调用
private void btnAddProperType_Click(object sender, EventArgs e)
{
MyAttr attr = new MyAttr();
attr.Name = txtName.Text.Trim();
attr.Value = txtValue.Text.Trim();
attr.Description = txtDescription.Text.Trim();
mac.Add(attr);
MyGrid.Refresh();
}
private void button1_Click(object sender, EventArgs e)
{
AddAttrColor();
AddAttrImage();
AddAttrEmun();
MyGrid.Refresh();
} private void AddAttrEmun()
{
MyAttr attr = new MyAttr();
attr.Name = "Dock";
attr.Value = DockStyle.Fill;
attr.Description = "枚举";
mac.Add(attr);
} private void AddAttrImage()
{
MyAttr attr = new MyAttr();
attr.Name = "Image";
attr.Value = new Bitmap(,);
attr.Description = "图片";
mac.Add(attr);
} private void AddAttrColor()
{
MyAttr attr = new MyAttr();
attr.Name = "Color";
attr.Value = Color.Red;
attr.Description = "颜色";
mac.Add(attr);
}
效果图