我想知道是否可以声明描述属性的属性属性,因此需要强类型,理想情况下,intellisense可用于选择属性。通过将成员声明为类型类型,类类型可以很好地工作 但是如何将属性作为参数,以便“PropName”不被引用并且是强类型的?
到目前为止:Attibute类和样本用法类似于
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class MyMeta : Attribute{
public Type SomeType { get; set; } // works they Way I like.
// but now some declaration for a property that triggers strong typing
// and ideally intellisense support,
public PropertyInfo Property { get; set; } //almost, no intellisence type.Prop "PropName" is required
public ? SomeProp {get;set;} // <<<<<<< any ideas of nice type to define a property
}
public class Example{
[MyMeta(SomeType = typeof(SomeOtherClass))] //is strongly typed and get intellisense support...
public string SomeClassProp { get; set; }
[MyMeta(SomeProp = Class.Member)] // <<< would be nice....any ideas ?
public string ClassProp2 { get; set; }
// instead of
[MyMeta(SomeProp = typeof(T).GetProperty("name" )] // ... not so nice
public string ClassProp3 { get; set; }
}
修改 为了避免使用属性名称字符串,我构建了一个简单的工具来保存编译时间检查,同时在地方存储和使用属性名称作为字符串。
这个想法是你通过intellisense帮助和类似resharper的代码完成,通过它的类型和名称快速引用一个属性。然后将STRING传递给工具。
I use a resharper template with this code shell
string propname = Utilites.PropNameAsExpr( (SomeType p) => p.SomeProperty )
指的是
public class Utilities{
public static string PropNameAsExpr<TPoco, TProp>(Expression<Func<TPoco, TProp>> prop)
{
//var tname = typeof(TPoco);
var body = prop.Body as System.Linq.Expressions.MemberExpression;
return body == null ? null : body.Member.Name;
}
}
答案 0 :(得分:1)
不,这是不可能的。您可以使用typeof
作为类型名称,但必须使用字符串作为成员名称。这是你可以得到的:
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class MyMeta : Attribute{
public Type SomeType { get; set; }
public string PropertyName {get;set;}
public PropertyInfo Property { get { return /* get the PropertyInfo with reflection */; } }
}
public class Example{
[MyMeta(SomeType = typeof(SomeOtherClass))] //is strongly typed and get intellisense support...
public string SomeClassProp { get; set; }
[MyMeta(SomeType = typeof(SomeOtherClass), PropertyName = "SomeOtherProperty")]
public string ClassProp2 { get; set; }
}