Accessing Management Information with System.Management(Chapter 2)

最新推荐文章于 2024-09-18 22:36:16 发布

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最新推荐文章于 2024-09-18 22:36:16 发布

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原文链接：https://yq.aliyun.com/articles/478875

本文通过同步和异步两种方式演示了如何使用System.Management类来枚举计算机上的Win32环境变量。同步方法中，创建了一个针对WIN32_Environment的查询，并通过ManagementObjectSearcher类获取并遍历环境变量。异步方法则利用了ManagementOperationObserver来处理事件。

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How To Retrive Collections Of Management Objects

The following code example uses the System.Management collection classes to enumerate environment variables on a computer. Some parameters can be left to default values in this example because the example gets information from the local computer. The managementscope class will be used if the information gets from romoting computer.

There are tow way to demostrate how to enumerate the collection of 'win32_environment'.

Synchronous way:

public void DoSynchronous()

{

//SelectQuery is inherited from ManagementQuery.
//The description about ManagementQuery in chapter 1

SelectQuery query = new SelectQuery("WIN32_Environment");

ManagementObjectSearcher mObjSearch = new ManagementObjectSearcher(query);
int count = mObjSearch.Get().Count;

            //ManagementBaseObect is inherited from ManagementObject;

            foreach (ManagementBaseObject item in mObjSearch.Get())
            {
                textBox1.Text += //string.Concat("classPath", item.ClassPath.Path) + System.Environment.NewLine +
                    //string.Concat("ClassName", item.ClassPath.ClassName) +
                    System.Environment.NewLine + string.Concat("Name", item["Name"]).PadRight(5, ' ') +
                     string.Concat("Value", item["VariableValue"])
                     + System.Environment.NewLine;
            }

}

Asynchronous way:

ManagementObjectSearcher mObjSearch = new ManagementObjectSearcher(new SelectQuery("WIN32_Service"));

ManagementOperationObserver mOperObserver = new ManagementOperationObserver();

mOperObserver.ObjectReady += new ObjectReadyEventHandler(mOperObserver_ObjectReady);

mOperObserver.Completed += new CompletedEventHandler(mOperObserver_Completed);

mObjSearch.Get(mOperObserver);

本文转自lidup 51CTO博客，原文链接：http://blog.51cto.com/lidup/325289，如需转载请自行联系原作者