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当我还没有声明实例时，我可以创建一个指向实例函数的指针吗？现在我正在使用反射来调用我的方法，但似乎使用某种委托可能会更容易。我就是想不通。我将调用的方法将始终返回相同的类型并且没有参数。

这是一些示例代码来说明我正在尝试做的事情：

Private Shared Function A() As Object

    Return Lauch(????) ' should call FunctionA of the instance (undeclared here)

End Function


Private Shared Function B() As Object

    Return Lauch(????) ' should call FunctionB of the instance (undeclared here)

End Function


Private Shared Function Lauch(Of T)(ByVal instanceFunc As Func(Of T)) As Object

    ' long and repetitive operations that I don't want to repeat in function A and B

    Dim myInstance As New MyClass()

    Return myInstance.instanceFunc()

End Function

现在我正在做类似以下的事情并且它有效，但我觉得应该有更好的方法：

Private Shared Function A() As Object

    Return Lauch("FunctionA")

End Function


Private Shared Function B() As Object

    Return Lauch("FunctionB")

End Function


Private Shared Function Lauch(ByVal instanceFunc As String) As Object

    ' long and repetitive operations that I don't want to repeat in function A and B

    Dim myInstance As New MyClass()

    Return myInstance.GetType().GetMethod(instanceFunc).Invoke(myInstance, Nothing))

End Function
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1 回答 1

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那这个呢？

Private Shared Function A() As Object
    Return Lauch(Function(x) x.A())
End Function


Private Shared Function Lauch(ByVal instanceFunc As Func(Of CustomClass, Object)) As Object
    ' long and repetitive operations
    Dim myInstance As New CustomClass()
    Return instanceFunc(myInstance)
End Function

基本上，您定义确定函数结果的Lauch函数。这是一个接受 aCustomClass并返回a 的函数Object。在A方法中定义此函数以返回实例A函数的结果。

于 2013-02-12T23:50:17.030 回答