clr

I have a ASP.NET MVC5 Web Application configured to run on .NET Framework version 4.5.1. However, I notice that when I get an application runtime exception of some sort, the version information displayed at the bottom of the yellow server error page says the following: Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34009 Why is this not 4.5.x? That is not the actual .NET framework version. It is the version of the CLR. From .NET 4 up to 4.5.2 it is version 4. Between 2.0 and 3.5 it was version 2.0. That is also the reason that in your application

I was writing an instructive example for a colleague to show him why testing floats for equality is often a bad idea. The example I went with was adding .1 ten times, and comparing against 1.0 (the one I was shown in my introductory numerical class). I was surprised to find that the two results were equal ( code + output ). float @float = 0.0f; for(int @int = 0; @int < 10; @int += 1) { @float += 0.1f; } Console.WriteLine(@float == 1.0f); Some investigation showed that this result could not be relied upon (much like float equality). The one I found most surprising was that adding code after the

This question already has an answer here: Non-unique enum values 6 answers In .NET can you have multiple enum values for the same integer? eg. public enum PersonGender { Unknown = 0, Male = 1, Female = 2, Intersex = 3, Indeterminate = 3, NonStated = 9, InadequatelyDescribed = 9 } In C#, this is allowed, as per the C# Language Specication , version 4. Section 1.10 Enums doesn't mention the possibility but later on in section 14 Enums , we see (in 14.3 ): Multiple enum members may share the same associated value. The example enum Color { Red, Green, Blue, Max = Blue } shows an enum in which two

When using the typeof operator on type created through TypeBuilder, the operator will return null. I'm curious why this happens and how to prevent it. I'm starting to think this is a VS bug in the immediate window, but I'm not quite sure. It's very easy to blame others first. Ok... code to reproduce issue: static void Main() { AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly( new AssemblyName("MyAssembly"), AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule"); TypeBuilder typeBuilder = moduleBuilder

I want to include the current time and date in a .net application so I can include it in the start up log to show the user what version they have. Is it possible to retrieve the current time during compilation, or would I have to get the creation/modification time of the executable? E.g. Welcome to ApplicationX. This was built day-month-year at time . If you're using reflection for your build number you can use that to figure out when a build was compiled. Version information for an assembly consists of the following four values: Major Version Minor Version Build Number Revision You can

When use ILSpy to check the code of System.String, I found there are some methods marked as MethodImplOptions.InternalCall such as: [SecurityCritical] [MethodImpl(MethodImplOptions.InternalCall)] internal static extern int nativeCompareOrdinalEx(string strA, int indexA, string strB, int indexB, int count); I know MethodImplOptions.InternalCall means this method is implemented natively by the common language runtime to optimized code to improve performance. My question is: Is that anyway can enable us to see the code marked as MethodImplOptions.InternalCall? You'll need the source code for the

I have a problem with memory leaks in my .NET Windows service application. So I've started to read articles about memory management in .NET. And i have found an interesting practice in one of Jeffrey Richter articles . This practice name is "object resurrection". It looks like situating code that initializes global or static variable to "this": protected override void Finalize() { Application.ObjHolder = this; GC.ReRegisterForFinalize(this); } I understand that this is a bad practice, however i would like to know patterns that uses this practice. If you know any, please write here. Speculative