This post describes one of the more no-brainerish ways of fixing a ‘System.OutOfMemoryException’ exceptions being thrown in your ASP.Net MVC application using C# and Entity Framework.
While developing a web project, for example ASP.NET MVC with EF, sometimes when handling a lot of data or complex entities on your dev machine, you encounter this error:
OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.] System.Text.StringBuilder.ToString() +35 System.IO.StreamReader.ReadToEnd() +123 System.Web.Optimization.BundleFile.ApplyTransforms() +74 System.Web.Optimization.DefaultBundleBuilder.BuildBundleContent(Bundle bundle, BundleContext context, IEnumerable`1 files) +472 System.Web.Optimization.Bundle.GenerateBundleResponse(BundleContext context) +127 System.Web.Optimization.Bundle.GetBundleResponse(BundleContext context) +45 System.Web.Optimization.BundleResolver.GetBundleContents(String virtualPath) +166 System.Web.Optimization.AssetManager.DeterminePathsToRender(IEnumerable`1 assets) +205 System.Web.Optimization.AssetManager.RenderExplicit(String tagFormat, String paths) +35 System.Web.Optimization.Scripts.RenderFormat(String tagFormat, String paths) +107 System.Web.Optimization.Scripts.Render(String paths) +21
By default, Visual Studio uses 32-bit version of IIS Express for your deployments. A lot of times, this is good and intended, and not a problem. In some rare cases this might mean, however, that your IIS processes are running out of memory.
I’m going to argue, that most of the time you shouldn’t end up having this issue if your code is sane and smart. With EF it’s somewhat easy to build apps that use a lot of memory, though. Perhaps your architecture does make sense, and using a lot of memory is ok?
In this case you might want to accommodate this memory requirement by enabling 64-bit version of IIS. This is luckily a pretty easy change.
How to solve System.OutOfMemoryException in Visual Studio?
The first thing is to make sure you’re not hogging all the available memory for no reason – no neverending loops or infinite recursion! After that, consider the following:
- You’ll need to enable 64-bit IIS Express from VS settings:
- Visual Studio – Tools – Options – Projects and Solutions – Web Projects – “User the 64 bit version of IIS Express for web sites and projects”, screenshot below:
- Also, don’t forget to verify you’re building 64-bit version of your app!
- Found this tip from Stack Overflow (disregard the memory hacks – shouldn’t be necessary).
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