问题描述
说,我有一个类,Foo,看起来像这样: public class Foo:IFoo
{
public Foo()
{
Bars = new List< dynamic>();
}
public IList< dynamic>酒吧{get;组; }
}
界面IFoo看起来像:
public interface IFoo
{
IList< dynamic>酒吧{get;组;
}
现在,当我执行以下操作:
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); //抛出一个'System.Collections.Generic.IList< object>'不包含'Add'的定义 - 异常!!!!!
foo.Bars.Add(b); // 同样在这里!!!!!
我在这里做错什么
这是一个已知的动态绑定。
以下是一些工作。
使用 ICollection< dynamic>
替代:
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>酒吧{get;组;
public class Foo:IFoo
{
public Foo()
{
Bars = new List< dynamic>() ;
}
public ICollection< dynamic>酒吧{get;组; }
}
或直线列表<动态> ;
:
public interface IFoo
{
列表< ;动态>酒吧{get;组;
public class Foo:IFoo
{
public Foo()
{
Bars = new List< dynamic>() ;
}
public List< dynamic>酒吧{get;组;
}
或使用 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);
}
或不动态绑定 add
,通过转换为对象
:
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);
}
或使用第三方框架(如即兴即时界面)更具表现力& (在nuget中)
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>酒吧{get;组; }
}
Say that I have a class, Foo, looking something like this:
public class Foo : IFoo
{
public Foo()
{
Bars = new List<dynamic>();
}
public IList<dynamic> Bars { get; set; }
}
The interface IFoo looks like:
public interface IFoo
{
IList<dynamic> Bars { get; set; }
}
Now, when I do the following:
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); // Throws an 'System.Collections.Generic.IList<object>' does not contain a definition for 'Add' - exception!!!!!
foo.Bars.Add(b); // Same here!!!!!
What am I doing wrong here?????
This is a known dynamic binding issue.
Here are some work arounds.
Use ICollection<dynamic>
instead:
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; }
}
Or straight up 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);
}
Or don't dynamic bind add
, by casting to 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);
}
Or be more expressive using a third party framework like my impromptu interface with ActLike & Prototype Builder Syntax (in nuget).
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; }
}
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