[英]Adding an Attribute for property in runtime (for design-time purposes)
I need to add an attribute to some property in runtime (for design-time purposes). 我需要在运行时为某些属性添加一个属性(出于设计时的目的)。 I know I can do this for classes:
我知道我可以在课堂上这样做:
TypeDescriptor.AddAttributes(typeof(MyType), new MyRuntimeAttribute());
But I can't find any way to do the same for properties. 但是我找不到任何对属性执行相同操作的方法。
Any suggestions? 有什么建议么?
UPD: The exactly task is following: UPD:确切的任务如下:
public class BaseClass {
public BaseClass(string name) { Name = name; }
public Name { get; set; }
}
public class Descendant1: BaseClass {
public Descendant1() : base("Default Name 1") { }
}
...
public class DescendantN: BaseClass {
public DescendantN() : base("Default Name N") { }
}
I want each of the descendants to have each own DefaultValueAttribute at the Name property with the corresponding default name. 我希望每个后代在Name属性中具有各自的DefaultValueAttribute和相应的默认名称。 And I don't want to hardcode DefaultValueAttribute on each descentand :)
而且我不想在每个descentand上硬编码DefaultValueAttribute :)
You can't dynamically add or remove attributes. 您不能动态添加或删除属性。 Note that TypeDescriptor doesn't actually add an attribute to the class either: If you check the array that
typeof(MyType).GetCustomAttributes(false)
returns after you attach your attribute with MyRuntimeAttribute you'll notice that it isn't part of it. 请注意,TypeDescriptor实际上也不会向该类添加属性:如果在将属性附加到MyRuntimeAttribute后检查
typeof(MyType).GetCustomAttributes(false)
返回的数组,您会注意到它不属于该属性。
Since you mention design-time, what you can do is dynamically modify attributes. 既然提到了设计时,那么您可以做的就是动态修改属性。 Is that what you actually want to do?
那是你真正想做的吗?
See also: 也可以看看:
You can also provide a control designer and in that designer you can override PreFilterProperties. 您还可以提供一个控件设计器,在该设计器中,您可以覆盖PreFilterProperties。 While typically this is used to hide properties, it can also be used to add them.
尽管通常将其用于隐藏属性,但也可以用于添加属性。
http://www.codeproject.com/KB/webforms/HidingProperties.aspx http://www.codeproject.com/KB/webforms/HidingProperties.aspx
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