这是已知的动态绑定issue https://web.archive.org/web/20130609133940/http://connect.microsoft.com/VisualStudio/feedback/details/534288/ilist-dynamic-cannot-call-a-method-add-without-casting.
这里有一些解决方法。
Use ICollection<dynamic>反而：
void Main()
{
IFoo foo = new Foo();
dynamic a = new System.Dynamic.ExpandoObject();
a.Prop = 10000;
dynamic b = new System.Dynamic.ExpandoObject();
b.Prop = "Some Text";
foo.Bars.Add(a);
foo.Bars.Add(b);
}
public interface IFoo
{
ICollection<dynamic> Bars { get; set; }
}
public class Foo : IFoo
{
public Foo()
{
Bars = new List<dynamic>();
}
public ICollection<dynamic> Bars { get; set; }
}
或者直接向上List<dynamic>:
public interface IFoo
{
List<dynamic> Bars { get; set; }
}
public class Foo : IFoo
{
public Foo()
{
Bars = new List<dynamic>();
}
public List<dynamic> Bars { get; set; }
}
Or use dynamic foo:
void Main()
{
dynamic foo = new Foo();
dynamic a = new System.Dynamic.ExpandoObject();
a.Prop = 10000;
dynamic b = new System.Dynamic.ExpandoObject();
b.Prop = "Some Text";
foo.Bars.Add(a);
foo.Bars.Add(b);
}
或者不要动态绑定add，通过投射到object:
void Main()
{
IFoo foo = new Foo();
dynamic a = new System.Dynamic.ExpandoObject();
a.Prop = 10000;
dynamic b = new System.Dynamic.ExpandoObject();
b.Prop = "Some Text";
foo.Bars.Add((object)a);
foo.Bars.Add((object)b);
}
或者使用第三方框架（例如我的即兴界面）更具表现力ActLike https://github.com/ekonbenefits/impromptu-interface/wiki/UsageBasic & 原型生成器语法 https://github.com/ekonbenefits/dynamitey/wiki/UsageBuilder（在 nuget 中）。
using ImprmoptuInterface;
using Dynamitey;
void Main()
{
dynamic New = Builder.New<ExpandoObject>();
IFoo foo = Impromptu.ActLike(
New.Foo(
Bars: New.List(
New.Obj(Prop:10000),
New.Obj(Prop:"Some Text")
)
)
);
}
public interface IFoo
{
IList<dynamic> Bars { get; set; }
}
