C#操作IIS创建应用程序池出现异常:无效索引(Exception from HRESULT:0x80070585)

在使用C#操作IIS创建应用程序池出现异常:无效索引(Exception from HRESULT:0x80070585)

相关代码:

public static string CreateAppPool(string appPoolName, string frameworkVersion, string managedPipelineMode)
         {
             DirectoryEntry rootfolder = new DirectoryEntry("IIS://localhost/W3SVC/APPPOOLS");

             try
             {
                 DirectoryEntry appPool = rootfolder.Chil
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