No one has really explained in plain terms how interfaces are useful, so I’m going to give it a shot (and steal an idea from Shamim’s answer a bit). Lets take the idea of a pizza ordering service. You can have multiple types of pizzas and a common action for each pizza is preparing the … Read more
I think I showed you this one before, but I like the fun here – this took some debugging to track down! (the original code was obviously more complex and subtle…) static void Foo<T>() where T : new() { T t = new T(); Console.WriteLine(t.ToString()); // works fine Console.WriteLine(t.GetHashCode()); // works fine Console.WriteLine(t.Equals(t)); // works … Read more
Update: For extensions to System.Diagnostics, providing some of the missing listeners you might want, see Essential.Diagnostics on CodePlex (http://essentialdiagnostics.codeplex.com/) Frameworks Q: What frameworks do you use? A: System.Diagnostics.TraceSource, built in to .NET 2.0. It provides powerful, flexible, high performance logging for applications, however many developers are not aware of its capabilities and do not make … Read more
Console.Write((int)response.StatusCode); HttpStatusCode (the type of response.StatusCode) is an enumeration where the values of the members match the HTTP status codes, e.g. public enum HttpStatusCode { … Moved = 301, OK = 200, Redirect = 302, … }
This may not the most efficient or optimized way to do it, but it’s easier to read if you are not familiar with log maths, and should be fast enough for most scenarios. string[] sizes = { “B”, “KB”, “MB”, “GB”, “TB” }; double len = new FileInfo(filename).Length; int order = 0; while (len >= … Read more
UPDATE: I liked this question so much I made it the subject of my blog on November 18th 2011. Thanks for the great question! I’ve always wondered: what is the purpose of the stack? I assume you mean the evaluation stack of the MSIL language, and not the actual per-thread stack at runtime. Why is … Read more
You can use the LINQ Concat and ToList methods: var allProducts = productCollection1.Concat(productCollection2) .Concat(productCollection3) .ToList(); Note that there are more efficient ways to do this – the above will basically loop through all the entries, creating a dynamically sized buffer. As you can predict the size to start with, you don’t need this dynamic sizing… … Read more
Use the overload that takes the existing destination: Mapper.Map<Source, Destination>(source, destination); Yes, it returns the destination object, but that’s just for some other obscure scenarios. It’s the same object.
Rico Mariani, the .NET Performance guru, had an article on this very subject. It’s not as simple as one might suspect. The basic advice is this: If your pattern looks like: x = f1(…) + f2(…) + f3(…) + f4(…) that’s one concat and it’s zippy, StringBuilder probably won’t help. If your pattern looks like: … Read more
Did you try to give the full path of the command that is running in the pre- or post-build event command? I was getting the 9009 error due to a xcopy post-build event command in Visual Studio 2008. The command “xcopy.exe /Y C:\projectpath\project.config C:\compilepath\” exited with code 9009. But in my case it was also … Read more