Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Resources / ResourceFallbackManager.cs / 1667663 / ResourceFallbackManager.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: ResourceFallbackManager ** **[....] ** ** ** Purpose: Encapsulates CultureInfo fallback for resource ** lookup ** ** ===========================================================*/ using System; using System.Collections; using System.Collections.Generic; using System.Globalization; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Runtime.Versioning; namespace System.Resources { internal class ResourceFallbackManager : IEnumerable{ private CultureInfo m_startingCulture; private CultureInfo m_neutralResourcesCulture; private bool m_useParents; // Note: As of .NET FX v4, we are reading a combined user-preferred and OS-preferred fallback array. // Added but disabled in CLR v4.0 // private static CultureInfo[] osFallbackArray; // private static readonly Object syncObj = new Object(); internal ResourceFallbackManager(CultureInfo startingCulture, CultureInfo neutralResourcesCulture, bool useParents) { if (startingCulture != null) { m_startingCulture = startingCulture; } else { m_startingCulture = CultureInfo.CurrentUICulture; } m_neutralResourcesCulture = neutralResourcesCulture; m_useParents = useParents; } IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } public IEnumerator GetEnumerator() { bool reachedNeutralResourcesCulture = false; // 1. starting culture chain, up to neutral CultureInfo currentCulture = m_startingCulture; do { if (m_neutralResourcesCulture != null && currentCulture.Name == m_neutralResourcesCulture.Name) { // Return the invariant culture all the time, even if the UltimateResourceFallbackLocation // is a satellite assembly. This is fixed up later in ManifestBasedResourceGroveler::UltimateFallbackFixup. yield return CultureInfo.InvariantCulture; reachedNeutralResourcesCulture = true; break; } yield return currentCulture; currentCulture = currentCulture.Parent; } while (m_useParents && !currentCulture.HasInvariantCultureName); if (!m_useParents || m_startingCulture.HasInvariantCultureName) { yield break; } // 2. user preferred cultures, omitting starting culture if tried already // Compat note: For console apps, this API will return cultures like Arabic // or Hebrew that are displayed right-to-left. These don't work with today's // CMD.exe. Since not all apps can short-circuit RTL languages to look at // US English resources, we're exposing an appcompat flag for this, to make the // osFallbackArray an empty array, mimicing our V2 behavior. Apps should instead // be using CultureInfo.GetConsoleFallbackUICulture, and then test whether that // culture's code page can be displayed on the console, and if not, they should // set their culture to their neutral resources language. // Note: the app compat switch will omit the user & OS Preferred fallback culture. // Compat note 2: This feature breaks certain apps dependent on fallback to neutral // resources. See extensive note in GetResourceFallbackArray. /* Added but disabled in CLR v4.0 LoadPreferredCultures(); foreach (CultureInfo ci in osFallbackArray) { // only have to check starting culture and immediate parent for now. // in Dev10, revisit this policy. if (m_startingCulture.Name != ci.Name && m_startingCulture.Parent.Name != ci.Name) { yield return ci; } } */ // 3. invariant // Don't return invariant twice though. if (reachedNeutralResourcesCulture) yield break; yield return CultureInfo.InvariantCulture; } /* Added but disabled in CLR v4.0 [System.Security.SecuritySafeCritical] private static void LoadPreferredCultures() { if (osFallbackArray != null) return; lock (syncObj) { // check again in case another thread won if (osFallbackArray != null) return; // after searching starting culture, we try user preferred cultures String[] userPreferredCultures = GetResourceFallbackArray(); if (userPreferredCultures == null) { osFallbackArray = new CultureInfo[0]; } else { CultureInfo[] tmp = new CultureInfo[userPreferredCultures.Length]; for (int i = 0; i < userPreferredCultures.Length; i++) { // get cached, read-only cultures to avoid excess allocations tmp[i] = CultureInfo.GetCultureInfo(userPreferredCultures[i]); } osFallbackArray = tmp; } } } [System.Security.SecurityCritical] private static String[] GetResourceFallbackArray() { // AppCompat note: We've added this feature for desktop V4 but we're ripping it out // before shipping V4. It shipped in SL 2 and SL 3. // // We have an appcompat problem that prevents us from adopting the ideal MUI model for // culture fallback. Up until .NET Framework v4, our fallback was this: // // CurrentUICulture & parents Neutral // // We also had applications that took a dependency on falling back to neutral resources. // IE, say an app is developed by US English developers - they may include English resources // in the main assembly, not ship an "en" satellite assembly, and ship a French satellite. // They may also omit the NeutralResourcesLanguageAttribute. // // Starting with Silverlight v2 and following advice from the MUI team, we wanted to call // the OS's GetThreadPreferredUILanguages, inserting the results like this: // // CurrentUICulture & parents user-preferred fallback OS-preferred fallback Neutral // // This does not fit well for two reasons: // 1) There is no concept of neutral resources in MUI // 2) The user-preferred culture fallbacks make no sense in servers & non-interactive apps // This leads to bad results on certain combinations of OS language installations, user // settings, and applications built in certain styles. The OS-preferred fallback should // be last, and the user-preferred fallback just breaks certain apps no matter where you put it. // // Necessary and sufficient conditions for an AppCompat bug (if we respected user & OS fallbacks): // 1) A French OS (ie, you walk into an Internet caf� in Paris) // 2) A .NET application whose neutral resources are authored in English. // 3) The application did not provide an English satellite assembly (a common pattern). // 4) The application is localized to French. // 5) The user wants to read English, expressed in either of two ways: // a. Changing Windows� Display Language in the Regional Options Control Panel // b. The application explicitly ASKS THE USER what language to display. // // Obviously the exact languages above can be interchanged a bit - I�m keeping this concrete. // Also the NeutralResourcesLanguageAttribute will allow this to work, but usually we set it // to en-US for our assemblies, meaning all other English cultures are broken. // // Workarounds: // *) Use the NeutralResourcesLanguageAttribute and tell us that your neutral resources // are in region-neutral English (en). // *) Consider shipping a region-neutral English satellite assembly. // Future work: // 1) Get data from Windows on priority of supporting OS preferred fallback. If needed, // change probing to look for CurrentUICulture, Neutral, then OS preferred fallback. // 2) Consider a mechanism for individual assemblies to opt into wanting user-preferred fallback. // They should ship their neutral resources in a satellite assembly, or use the // NeutralResourcesLanguageAttribute to say their neutral resources are in a REGION-NEUTRAL // language. An appdomain or process-wide flag may not be sufficient. // 3) Ask Windows to clarify the scenario for the OS preferred fallback list, to decide whether // we should probe there before or after looking at the neutral resources. If we move it // to after the neutral resources, ask Windows to return a user-preferred fallback list // without the OS preferred fallback included. This is a feature request for // GetThreadPreferredUILanguages. We can muddle through without it by removing the OS // preferred fallback cultures from end of the combined user + OS preferred fallback list, carefully. // 4) Do not look at user-preferred fallback if Environment.UserInteractive is false. (IE, // the Windows user who launches ASP.NET shouldn't determine how a web page gets // localized - the server itself must respect the remote client's requested languages.) // 5) Consider revisiting guidance for using the NeutralRsourcesLanguageAttribute - always emit it // with a region-neutral language (ie, "en"). // 6) Figure out what should happen in servers (ASP.NET, SQL, NT Services, etc). return CultureInfo.nativeGetResourceFallbackArray(); } */ } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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