Question

我正在尝试使用ManagementObjectSearcher运行查询，这是我的代码：（网络核心2.1）

 ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * from Win32_Printer");
    ManagementObjectCollection coll = searcher.Get();

在我的计算机上（Windows 10）可以正常工作，但在客户端计算机Windows Server 2012R2上却出现以下错误：

`Unhandled Exception: System.TypeInitializationException: The type initializer fo
r 'System.Management.ManagementPath' threw an exception. ---> System.TypeInitial
izationException: The type initializer for 'System.Management.WmiNetUtilsHelper'
 threw an exception. ---> System.ArgumentNullException: Value cannot be null.
Parameter name: ptr
   at System.Runtime.InteropServices.Marshal.GetDelegateForFunctionPointer(IntPt
r ptr, Type t)
   at System.Runtime.InteropServices.Marshal.GetDelegateForFunctionPointer[TDele
gate](IntPtr ptr)
   at System.Management.WmiNetUtilsHelper.LoadDelegate[TDelegate](TDelegate& del
egate_f, IntPtr hModule, String procName)
   at System.Management.WmiNetUtilsHelper..cctor()
   --- End of inner exception stack trace ---
   at System.Management.MTAHelper.IsNoContextMTA()
   at System.Management.MTAHelper.CreateInMTA(Type type)
   at System.Management.ManagementPath.CreateWbemPath(String path)
   at System.Management.ManagementPath..ctor(String path)
   at System.Management.ManagementPath..cctor()
   --- End of inner exception stack trace ---
   at System.Management.ManagementScope._Clone(ManagementScope scope, Identifier
ChangedEventHandler handler)
   at System.Management.ManagementObjectSearcher..ctor(ManagementScope scope, Ob
jectQuery query, EnumerationOptions options)`

我将其发布为win-86 exe

Answer 1

似乎System.Management需要完整的.NET Framework。此特定查询似乎仅适用于.NET Framework 4.7。我已经用4.0、4.5.2和4.7.2进行了测试，只有后者不会给我这个例外。我的C:\Windows\Microsoft.NET\Framework64\v4.0.30319\WMINet_Utils.dll版本是4.7.2053.0

请注意，Microsoft不鼓励使用System.Management的新代码，而应使用Microsoft.Management.Infrastructure。

网络核心：ManagementObjectSearcher在初始化时引发异常

1 个答案: