This article describes hotfix rollup 3139546, which is available for the Microsoft .NET Framework 4.5.2, 4.5.1, and 4.5. For more information about the issues that the hotfix rollup fixes, see the "Issues that this hotfix rollup fixes" section.
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To apply this hotfix, you must have the .NET Framework 4.5.2, 4.5.1, or 4.5 installed.
You must restart the computer after you apply this hotfix if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this hotfix.
Hotfix replacement information
This hotfix package doesn't replace a previously released hotfix package.
Issues that this hotfix rollup fixes
When you run an application that experiences heavy workloads and a specific usage pattern for dynamic methods (for example, Entity Framework, LINQ to SQL), the application may crash intermittently.
This behavior occurs because of an issue in dynamic method lifetime management. When this issue occurs, a System.Reflection.TargetInvocationException error is thrown.
This fix corrects the lifetime management issue.
Both System.Web.Caching and System.Runtime.Caching report the volume of memory used by the whole AppDomain instead of the volume of memory used by the cached items.
This is a regression issue from the .NET Framework 4.5 in which a change in Timer implementation was made. In addition to reporting an incorrect size, the additional objects referenced by the cache may significantly affect Gen2 GC latency. In ASP.NET hosting scenarios, the cache also miscalculates the size of all caches in all application domains (reported through the Cache % Process Memory Limit Used ASP.NET performance counter) when application domains are recycled.
The fix removes unintended references from the cache to the rest of the app domain objects, and therefore the correct size is now reported. It also includes changes to improve the latency for System.Runtime.Caching on multi-core computers that are using Server GC. Finally, this fix enables the correct calculation of all cache sizes in app domain recycling scenarios.