.net-4.0

My web service writes several thousands of transactions per minute and we save them on the hd. I was testing different ways to save these files and I made some tests with standard IO and with MemoryMapped files. In my results, writing files (20 k text files) with MemoryMapped files is about 4x faster than standard IO and I was not able to find any disadvantages. As I have not so much experience with this technology, do you think I may face any problem using them or you don't see any disadvantage? Thanks! EDIT 1 , here the source: namespace FileWritingTests.Writers { public class

I read a data from a text file using TextReader TextReader reader = new StreamReader(stream); string line; while ((line = reader.ReadLine()) != null) { //....... } Sometimes I need to peek next line ( or a few next lines ) from reader. How do I do that? EDIT: Updated to allow any number of peeks: public class PeekingStreamReader : StreamReader { private Queue<string> _peeks; public PeekingStreamReader(Stream stream) : base(stream) { _peeks = new Queue<string>(); } public override string ReadLine() { if (_peeks.Count > 0) { var nextLine = _peeks.Dequeue(); return nextLine; } return base

My server side sends me batches of messages. The no of messages in a batch and frequency is arbitrary. At times I get messages at 1 minute intervals and at times not messages for an hour. At times 1 message and at times 10. My current implementation uses Observable.Buffer(TimeSpan.FromSeconds(5)) to group and send the messages to subscriber. Instead of having to check every 5 seconds, is there a way to configure the Observable to say send your buffered messages to subscriber if there's a x seconds delay between two message. Where I am getting at is to avoid a unnecessary timer ticking every 5

We are creating an application which supports plugins using MEF. We are determining what type of plugins the user is able to create, and want to use dependency injection to provide this type of plugin with the data it needs. For example, we make a plugin that is able to display a list. To achieve this, it needs the existing instance of the IRepository for the type of data the list will display. The IRepository is created somewhere else in a datacontext class, so we are unable to let MEF itself create an instance of the IRepository. My idea is to inject the existing instance of the IRepository

How to create NAMED-PIPE in .NET-4 in your C# application? Chris Taylor Here is a piece of code to create a Named Pipe client, it is lifted from an answer to a previous question I answered on communicating between C++ and C# using Named Pipes using System; using System.Text; using System.IO; using System.IO.Pipes; namespace CSPipe { class Program { static void Main(string[] args) { NamedPipeClientStream pipe = new NamedPipeClientStream(".", "HyperPipe", PipeDirection.InOut); pipe.Connect(); using (StreamReader rdr = new StreamReader(pipe, Encoding.Unicode)) { System.Console.WriteLine(rdr

I have my own debugger for .NET apps that uses IMetaDataImport interface When I call ResolveTypeRef method, I always get NotImplementedException . The definition of ResolveTypeRef is like this: [ComImport] [Guid("....")] //a valid GUID [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] [CLSCompliant(false)] public interface IMetaDataImport { void ResolveTypeRef( [ComAliasName("mdTypeRef")] mdToken tr, [ComAliasName("REFIID")] ref Guid riid, [ComAliasName("IUnknown**"), Out, MarshalAs(UnmanagedType.IUnknown)] out object ppIScope, [ComAliasName("mdTypeDef*"), Out] out mdToken ptd ); // ...