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//------------------------------------------------------------------------------
// <copyright file="IISVersionHelper.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
using System.Runtime.InteropServices;
namespace System.Web.Configuration {
internal class IISVersionHelper : IDisposable {
const int IIS_PRODUCT_EXPRESS = 2;
[ComImport, Guid("1B036F99-B240-4116-A6A0-B54EC5B2438E"), InterfaceType((short)1)]
interface IIISVersion {
[return: MarshalAs(UnmanagedType.Struct)]
object GetPropertyValue([In, MarshalAs(UnmanagedType.BStr)] string bstrName);
[return: MarshalAs(UnmanagedType.Struct)]
object CreateObjectFromProgId([In, MarshalAs(UnmanagedType.BStr)] string bstrObjectName);
[return: MarshalAs(UnmanagedType.Struct)]
object CreateObjectFromClsId([In] Guid clsidObject);
void ApplyIISEnvironmentVariables();
void ClearIISEnvironmentVariables();
void ApplyManifestContext();
void ClearManifestContext();
}
[ComImport, InterfaceType((short)1), Guid("9CDA0717-2EB5-42b3-B5B0-16F4941B2029")]
interface IIISVersionManager {
[return: MarshalAs(UnmanagedType.Interface)]
IIISVersion GetVersionObject([In, MarshalAs(UnmanagedType.BStr)] string bstrVersion, [In, MarshalAs(UnmanagedType.I4)] int productType);
[return: MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_VARIANT)]
IIISVersion[] GetAllVersionObjects();
}
IIISVersionManager _versionManager;
IIISVersion _version;
internal IISVersionHelper(string version) {
// version is null if we're supposed to use the OS's IIS installation
if (version == null)
return;
try {
_versionManager = CreateVersionManager();
_version = _versionManager.GetVersionObject(version, IIS_PRODUCT_EXPRESS);
_version.ApplyManifestContext();
}
catch {
Release();
throw;
}
}
private static IIISVersionManager CreateVersionManager() {
Type type = Type.GetTypeFromProgID("Microsoft.IIS.VersionManager", throwOnError: true);
return (IIISVersionManager)Activator.CreateInstance(type);
}
public void Dispose() {
if (_version != null) {
_version.ClearManifestContext();
Release();
}
}
private void Release() {
if (_version != null) {
Marshal.ReleaseComObject(_version);
_version = null;
}
if (_versionManager != null) {
Marshal.ReleaseComObject(_versionManager);
_versionManager = null;
}
}
}
}
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