创建 Windows 还原点？

Question

所以我有这段代码，但我遇到了一些迄今为止我无法解决的问题：

任何有参数的地方，即"CreateRestorePoint" 或inParams 参数，我都会得到绿色波浪下划线，表示使用（例如）"NameOf(CreateRestorePoint) instead of specifying the program element name"。

但是，无论我这样做还是离开，我都会收到同样的错误：

System.ArgumentOutOfRangeException: 'Specified argument was out of the range of valid values. Parameter name: path'

代码：

    Public Function CreateRestorePoint(Description As String, EventType As Integer, RestorePointType As Integer) As Integer

        Try

            Dim classInstance As New ManagementObject("root\DEFAULT", "SystemRestore", Nothing)

            ' Obtain [in] parameters for the method
            Dim inParams As ManagementBaseObject = classInstance.GetMethodParameters("CreateRestorePoint")

            ' Add the input parameters
            inParams("Description") = Description
            inParams("EventType") = EventType
            inParams("RestorePointType") = RestorePointType

            ' Execute the method and obtain the return values
            Dim outParams As ManagementBaseObject = classInstance.InvokeMethod("CreateRestorePoint", inParams, Nothing)

            ' List outParams
            Debug.Print("Out parameters: ")
            Debug.Print("ReturnValue: {0}", outParams("ReturnValue"))

            CreateRestorePoint = 1

        Catch err As ManagementException

            Debug.Print(String.Format("An error occurred while trying to execute the WMI method: {0}", err.Message))

        End Try

        Return CreateRestorePoint

    End Function

这是我调用函数的方式：

    Dim CRP As New JSEWindowsRestore.WindowsRestoreFunctions

    CRP.CreateRestorePoint(String.Format("Test Restore Point: {0}", DateTime.Now), 100, 12)

有人发现问题了吗？

Answer 1

一切看起来都不错。您唯一需要更改的是 ManagementClass 前几行中的 ManagementObject。

Dim classInstance As New ManagementClass("root\DEFAULT", "SystemRestore", Nothing)

ManagementObject 是指类的一个实例，而 ManagementClass 是指类本身。您收到的 path 错误是因为代码需要一个实例路径而不是类本身。

至于绿色的波浪线，它们不应该阻止你编译，但它可能的 Visual Studio 会更喜欢这种语法。

        inParams.Properties("Description").Value = Description
        inParams.Properties("EventType").Value = EventType
        inParams.Properties("RestorePointType").Value = RestorePointType

另外，请确保应用程序具有管理员权限，否则当您尝试调用此方法时，您将被拒绝访问。