C#：获取域中计算机的信息

为了获取网络中某台计算机的信息，我应该在 C# 中使用哪些类？ （例如谁登录了该计算机、该计算机上正在运行什么操作系统、打开了哪些端口等）

查看系统管理 http://msdn.microsoft.com/en-us/library/system.management(loband).aspx and 系统.管理.管理类 http://msdn.microsoft.com/en-us/library/system.management.managementclass.aspx。两者都用于访问 WMI，即如何获取相关信息。

Edit:更新了示例以从远程计算机访问 WMI：

ConnectionOptions options;
options = new ConnectionOptions();

options.Username = userID;
options.Password = password;
options.EnablePrivileges = true;
options.Impersonation = ImpersonationLevel.Impersonate;

ManagementScope scope;
scope = new ManagementScope("\\\\" + ipAddress + "\\root\\cimv2", options);
scope.Connect();

String queryString = "SELECT PercentProcessorTime, PercentInterruptTime, InterruptsPersec FROM Win32_PerfFormattedData_PerfOS_Processor";

ObjectQuery query;
query = new ObjectQuery(queryString);

ManagementObjectSearcher objOS = new ManagementObjectSearcher(scope, query);

DataTable dt = new DataTable();
dt.Columns.Add("PercentProcessorTime");
dt.Columns.Add("PercentInterruptTime");
dt.Columns.Add("InterruptsPersec");

foreach (ManagementObject MO in objOS.Get())
{
    DataRow dr = dt.NewRow();
    dr["PercentProcessorTime"] = MO["PercentProcessorTime"];
    dr["PercentInterruptTime"] = MO["PercentInterruptTime"];
    dr["InterruptsPersec"] = MO["InterruptsPersec"];

    dt.Rows.Add(dr);
}

注意：必须定义用户 ID、密码和 ip 地址以匹配您的环境。