问如何删除dllimport的默认搜索路径

EN

    'Trying to remove default search paths    
    <System.AttributeUsage(System.AttributeTargets.Assembly Or System.AttributeTargets.Method, AllowMultiple:=False)>
        Public NotInheritable Class DefaultDllImportSearchPathsAttribute
            Inherits Attribute
        End Class

        'Trying to add my own path
        <DllImport("kernel32.dll", SetLastError:=True, CharSet:=CharSet.Auto)>
        Public Shared Function SetDllDirectory(ByVal lpPathName As String) As Long
        End Function

    'Importing my DLL
        <DllImport("A.dll", CallingConvention:=CallingConvention.StdCall)>
        Public Shared Sub B(<MarshalAs(UnmanagedType.BStr)> ByRef X As String)

        End Sub

    Dim path As String = My.Computer.Registry.GetValue("HKEY_CURRENT_USER\Software\A\", "path", Nothing)

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
            SetDllDirectory(path)
    End Sub