GAC was split into two.

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在.NET Framework 4.0中，全局程序缓存(GAC)进行了重大更新，为避免CLR2.0与CLR4.0之间的应用程序冲突，GAC被拆分为两个独立的缓存。这意味着针对CLRv2.0的应用无法看到CLRv4.0的程序集。

In .NET Framework 4.0, the GAC went through a few changes. The GAC was split into two, one for each CLR.

The CLR version used for both .NET Framework 2.0 and .NET Framework 3.5 is CLR 2.0. There was no need in the previous two framework releases to split GAC. The problem of breaking older applications in Net Framework 4.0.

To avoid issues between CLR 2.0 and CLR 4.0 , the GAC is now split into private GAC’s for each runtime.The main change is that CLR v2.0 applications now cannot see CLR v4.0 assemblies in the GAC.