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我是反射的新手。我需要创建一个继承自父类的类。我需要创建一个只读属性。此属性通过传递参数 25 调用父类中的现有函数。

一切正常，除了我无法将值 25 传递给被调用的函数。下面是生成类的代码。请协助。谢谢。

    Public Shared Function GetDynamicClass() As Type
        Dim asmName As New AssemblyName
        asmName.Name = "MyAssm"

        Dim asmBuilder As AssemblyBuilder = Thread.GetDomain().DefineDynamicAssembly (asmName, AssemblyBuilderAccess.RunAndSave)
        Dim mdlBuilder As ModuleBuilder = asmBuilder.DefineDynamicModule("MyDynModule")

        Dim TypeBldr As TypeBuilder = mdlBuilder.DefineType("MyDynClass", TypeAttributes.[Public] Or TypeAttributes.[Class])
        TypeBldr.SetParent(GetType(MyParent))

        Dim PropertyName As String = ""
        Dim PropBldr As PropertyBuilder = Nothing
        Dim GetSetAttr As MethodAttributes = Nothing
        Dim currGetPropMthdBldr As MethodBuilder = Nothing
        Dim currGetIL As ILGenerator = Nothing
        Dim mi As MethodInfo = Nothing

        PropertyName = "SurveyDate"
        PropBldr = TypeBldr.DefineProperty(PropertyName, PropertyAttributes.None, GetType(Object), New Type() {GetType(Object)})
        GetSetAttr = MethodAttributes.[Public] Or MethodAttributes.HideBySig
        currGetPropMthdBldr = TypeBldr.DefineMethod("get_value", GetSetAttr, GetType(Object), Type.EmptyTypes)
        currGetIL = currGetPropMthdBldr.GetILGenerator()
        mi = GetType(MyParent).GetMethod("GetProgress")

        currGetIL.DeclareLocal(GetType(Object))
        currGetIL.Emit(OpCodes.Ldarg_0)
        currGetIL.Emit(OpCodes.Ldc_I4_0)
        currGetIL.Emit(OpCodes.Conv_I8)
        currGetIL.Emit(OpCodes.Call, mi)

        currGetIL.Emit(OpCodes.Ret)
        PropBldr.SetGetMethod(currGetPropMthdBldr)

        Return TypeBldr.CreateType

    End Function
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1 回答 1

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Suppose you changed this:

    currGetIL.Emit(OpCodes.Ldc_I4_0)
    currGetIL.Emit(OpCodes.Conv_I8)

into this:

    currGetIL.Emit(OpCodes.Ldc_I4, 25)
    currGetIL.Emit(OpCodes.Conv_I8)

LDC_I4_0 is an opcode that loads the value "0". LDC_I4, on the other hand, lets you specify the actual argument yourself.

(Caveat: untested, got this from reading the docs)

于 2009-12-29T07:35:00.727 回答