C# .NET ManagementObjectSearcher 查询

发布于 2024-09-26 05:30:52 字数 546 浏览 4 评论 0原文

我的 C# .NET 2.0 应用程序使用 ManagementObjectSearcher 类执行两个查询：

_searcher = new ManagementObjectSearcher("root\\WMI", "SELECT * FROM MSWmi_PnPInstanceNames");

_searcher = new ManagementObjectSearcher("root\\WMI", "SELECT * FROM MSSerial_PortName");

我想将它们组合起来，以便 _searcher 包含两个查询的所有结果。但是，当我尝试这样做时...

_searcher = new ManagementObjectSearcher("root\\WMI", "SELECT * FROM MSWmi_PnPInstanceNames AND MSSerial_PortName");

...抛出“无效查询”异常。有人对我如何使这项工作有任何想法吗？谢谢。

原文

My C# .NET 2.0 application performs two queries using the ManagementObjectSearcher class:

_searcher = new ManagementObjectSearcher("root\\WMI", "SELECT * FROM MSWmi_PnPInstanceNames");

_searcher = new ManagementObjectSearcher("root\\WMI", "SELECT * FROM MSSerial_PortName");

I would like to combine them, so that _searcher contains all the results from both queries. However, when I try to do this...

_searcher = new ManagementObjectSearcher("root\\WMI", "SELECT * FROM MSWmi_PnPInstanceNames AND MSSerial_PortName");

...an "Invalid query" exception is thrown. Does anyone have any ideas as to how I can make this work? Thanks.

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夏の忆 2024-10-03 05:30:52

遗憾的是，WMI 查询语言不支持 join 或 union 操作，因此您必须单独运行这些查询（因为从不同的对象中选择）商店）。

WMI 查询语言 (WQL) 是 ANSI SQL 的子集 — 具有一些语义更改。并非所有在 SQL 中能做的事情都可以在 WQL 中实现。您可以查看 WMI 支持的查询构造在线访问 MSDN。

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那些过往 2024-10-03 05:30:52

我能够使用多个表运行查询，如下所示

 ManagementObjectSearcher searcher; 
 query = new ObjectQuery(string.Format("Select SMS_CollectToSubCollect.subCollectionID,SMS_Collection.Name " +
                                        " from SMS_CollectToSubCollect, SMS_Collection " +
                                        " where  subCollectionID in " +
                                        " (select CollectionID  from SMS_Collection where name='{0}') " +
                                        " and SMS_Collection.CollectionID  =  SMS_CollectToSubCollect.parentCollectionID " , name));
foreach (ManagementObject queryObj in searcher.Get())
{
//TODO:read values from results 
 }

希望这有帮助

I am able to run query with multiple tables as shown below

 ManagementObjectSearcher searcher; 
 query = new ObjectQuery(string.Format("Select SMS_CollectToSubCollect.subCollectionID,SMS_Collection.Name " +
                                        " from SMS_CollectToSubCollect, SMS_Collection " +
                                        " where  subCollectionID in " +
                                        " (select CollectionID  from SMS_Collection where name='{0}') " +
                                        " and SMS_Collection.CollectionID  =  SMS_CollectToSubCollect.parentCollectionID " , name));
foreach (ManagementObject queryObj in searcher.Get())
{
//TODO:read values from results 
 }

Hope this helps

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~没有更多了~