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    <p><del>I think the COM+ Administrative components only lets you query the "static" configuration properties (e.g. Identity, IsEnabled) and doesn't let you query the dynamic properties of COM+ (e.g. PID).</p> <p>The only way I found to do what you want is using the COMSVCSLib (COM+ Services Type Library). </del> <p> <strong>UPDATE</strong>: Based on @Vagaus's comment, we can use <em>either</em> COM+ Administrative components or COM+ Services Type Library!</p> <p>With quite a bit of help from the article <a href="http://www.codeproject.com/KB/cs/comonitorproject.aspx" rel="noreferrer">Comonitor - A COM+ Monitor</a>. I've cobbled together some code that uses COM+ Services Type Library:</p> <pre><code>public static bool IsComPlusApplicationRunning(string appName) { int appDataSize = Marshal.SizeOf(typeof(COMSVCSLib.appData)); Type appDataType = typeof(COMSVCSLib.appData); uint appCount; IntPtr appDataPtr = IntPtr.Zero; GCHandle gh = GCHandle.Alloc(appDataPtr, GCHandleType.Pinned); IntPtr addressOfAppDataPtr = gh.AddrOfPinnedObject(); COMSVCSLib.IGetAppData getAppData = null; COMSVCSLib.TrackerServer tracker = null; try { tracker = new COMSVCSLib.TrackerServerClass(); getAppData = (COMSVCSLib.IGetAppData)tracker; getAppData.GetApps(out appCount, addressOfAppDataPtr); appDataPtr = new IntPtr(Marshal.ReadInt32(addressOfAppDataPtr)); for (int appIndex = 0; appIndex &lt; appCount; appIndex++) { COMSVCSLib.appData appData = (COMSVCSLib.appData)Marshal.PtrToStructure( new IntPtr(appDataPtr.ToInt32() + (appIndex * appDataSize)), appDataType); string currentAppName = GetPackageNameByPID(appData.m_dwAppProcessId); if (string.Compare(currentAppName, appName, StringComparison.OrdinalIgnoreCase) == 0) { Console.WriteLine("Application " + appName + " is running with PID " + appData.m_dwAppProcessId); return true; } } } finally { Marshal.FreeCoTaskMem(appDataPtr); if (tracker != null) { Marshal.ReleaseComObject(tracker); } gh.Free(); } return false; } private static string GetPackageNameByPID(uint PID) { COMSVCSLib.MtsGrp grpObj = new COMSVCSLib.MtsGrpClass(); try { object obj = null; COMSVCSLib.COMEvents eventObj = null; for (int i = 0; i &lt; grpObj.Count; i++) { try { grpObj.Item(i, out obj); eventObj = (COMSVCSLib.COMEvents)obj; if (eventObj.GetProcessID() == PID) { return eventObj.PackageName; } } finally { if (obj != null) { Marshal.ReleaseComObject(obj); } } } } finally { if (grpObj != null) { Marshal.ReleaseComObject(grpObj); } } return null; } </code></pre> <p><br /></p> <p>But we can also use the COM+ Administrative components (which seems simpler) to do the same thing:</p> <pre><code>public static bool IsComPlusApplicationRunning(string appName) { COMAdmin.COMAdminCatalog catalog = new COMAdmin.COMAdminCatalogClass(); COMAdmin.ICatalogCollection appCollection = (COMAdmin.ICatalogCollection)catalog.GetCollection("Applications"); appCollection.Populate(); Dictionary&lt;string, string&gt; apps = new Dictionary&lt;string, string&gt;(); COMAdmin.ICatalogObject catalogObject = null; // Get the names of the applications with their ID and store for later for (int i = 0; i &lt; appCollection.Count; i++) { catalogObject = (COMAdmin.ICatalogObject)appCollection.get_Item(i); apps.Add(catalogObject.get_Value("ID").ToString(), catalogObject.Name.ToString()); } appCollection = (COMAdmin.ICatalogCollection)catalog.GetCollection("ApplicationInstances"); appCollection.Populate(); for (int i = 0; i &lt; appCollection.Count; i++) { catalogObject = (COMAdmin.ICatalogObject)appCollection.get_Item(i); if (string.Compare(appName, apps[catalogObject.get_Value("Application").ToString()], StringComparison.OrdinalIgnoreCase) == 0) { Console.WriteLine(appName + " is running with PID: " + catalogObject.get_Value("ProcessID").ToString()); return true; } } return false; } </code></pre>
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