Question

我的银灯应用有两种不同的XAP,一种初步XAP,固定在超文本页上载,另一种是动态XAP,在最初XAP中装上代码。自动取款机装载的代码类似:

var asm = LoadAssemblyFromXap(stream, "DLLName"); 
// LoadAssemblyFromXAP will load the DynamicXAP as a file stream, 
// unpack it and load DLLName as a dll. 
var controllerType = asm.GetType("ClassNameToInstantiate_InsideAsm");
var constructor = controllerType.GetConstructor(Type.EmptyTypes);
return constructor.Invoke(null);

我有一个使用思考(特别是外地信息)的类别来使数据具有约束力。这一类别在初始XAP中界定。如果我试图在动态XAP中使用这一类别,我就有一个错误:

Message: Unhandled Error in Silverlight Application System.FieldAccessException: Class.In.DynamicXAP.Which.Uses.The.Reflection.Class.In.InitialXAP
   at System.Reflection.RtFieldInfo.PerformVisibilityCheckOnField(IntPtr field, Object target, IntPtr declaringType, FieldAttributes attr, UInt32 invocationFlags)
   at System.Reflection.RtFieldInfo.InternalGetValue(Object obj, Boolean doVisibilityCheck, Boolean doCheckConsistency)
   at System.Reflection.RtFieldInfo.InternalGetValue(Object obj, Boolean doVisibilityCheck)
   at System.Reflection.RtFieldInfo.GetValue(Object obj)

我可以打破这一错误,利用反省,用反省的方法,制造一个子级:

public class InitialXAP.ClassUsingReflection {

        public virtual object GetValue()
        {
            return fieldInfo.GetValue(parent);
        }
}

public class ClassUsingReflection : InitialXAP.ClassUsingReflection {

        public override object GetValue()
        {
            return fieldInfo.GetValue(parent);
        }
}

但我倾向于避免这种重复,允许在动态XAP中从最初的XAP中进行反思。关于我能做些什么的想法?

Answer 1

虽然有一个学习曲线,但我想看一下银星号、EF或棱镜(两者在最近B>)。它们既支持模块的动态负荷,也支持采用良好的再利用模式和单独/开发。

Answer 2

<编码>InitialXAP.ClassUsing Reflection

Note the duplicate isn t part of the inital xap namespace (ClassUsingReflection), and may be imported. Notice GetVisible - as in not visible to Dynamic xap... Just leave the duplicate (take away base class obviously) and try.

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