Question

所以我有这段代码，并且遇到了一些我到目前为止无法解决的问题：

在任何有参数（即"CreateRestorePoint"或inParams参数）的地方，我都会看到绿色的波浪形下划线，表示要使用（例如）"NameOf(CreateRestorePoint) instead of specifying the program element name"。

但是，无论我这样做还是保留它，我都会遇到相同的错误：

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

这是我调用该函数的方式：

    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。唯一需要更改的是ManagementClass的前几行中的ManagementObject。

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

ManagementObject引用一个类的实例，ManagementClass引用该类本身。您收到的path错误是因为代码期望的是实例的路径，而不是类本身的路径。

对于绿色的波浪线，它们不应阻止您进行编译，但可能的Visual Studio会更喜欢此语法。

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

此外，请确保该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获得拒绝访问的权限。

创建Windows还原点？

1 个答案: