Entity Framework is a built-in ORM in .NET. It’s great to work with. It handles the complete data access for you. (Connection, query generating, executing of SQL commands etc.) The performance is OK, if you don’t work with lot of data. The current release (.NET 4.0) doesn’t support batch processing. That means: If you add… Read More »
The motivation of aspect-oriented programming is to separate program logic. Application can be devided in two concerns. 1. Core: Contains the program/business logic like calculation etc. 2. System: Contains system specific processes like logging. In this example, I show you how to implement a AOP based logger. Logging is something you need very often. But… Read More »
Since C# supports optional paramters it is much easier to work with COM objects. Sometimes you don’t want to set every parameter when you call a method from a COM object. Let’s take the “Office Word” object for this easy example. The following C# 3.5 code creates a Office Word object and opens the document… Read More »
It’s possible to run .NET code inside a Stored Procedure. How it works: First create a new “Visual C# SQL CLR Database Project”. (There is a same template for VB.NET. But who uses VB nowadays??? :)) You have to define the connection to your database. If you are using Visual Studio 2010 be sure to… Read More »
It is really easy to debug COM registered .NET libraries. The only thing you have to do is calling the “Debug.Assert();” method in the .NET code. See the code: [ComVisible(true)] public class Lib { public string HelloWorld() { Debug.Assert(false, “Debug!”); return “hello world”; } } When you call the method for instance from a VBScript… Read More »
You may know the Optional and Named Parameters from other programming languages. C# supports this functionality since version 4.0. In the example below you see how you can define Optional Parameters (see signature of “RegisterUser”) and how you can call this method. class Program { static void Main(string[] args) { // normal call Program.RegisterUser(“fname1”, “fname1”,… Read More »
Microsoft implemented some nice dynamic features in .NET 4.0. For instance the new data type “dynamic”. Loading dynamically Libraries with .NET < 4.0 reflection can be tricky. In the following example you see how it works. (Well, there are multiple possibilities for this..) Assembly asbMath = Assembly.LoadFrom(“Lib.dll”); object objMath = asbMath.CreateInstance(“Lib.Math”); Type tMath = asbMath.GetType(“Lib.Math”);… Read More »
In Reporting Services you can’t create multilanguage Reports. You have to load the language resources from a DB, File etc. Last week I wrote a DLL, which reads language resources from a database. The DLL worked well… (in my test Console Application). Afterwards, I added the DLL to my Report and tried to load a… Read More »
Es gibt zwei Varianten Files vom Internet zu kopieren. Hier die einfachere Variante: Die Methode “DownloadFile” holt sich das File und speichert es lokal ab. string strUrlPicture = “http://www.yoururlhere.abc/logo.gif”; WebClient client = new WebClient(); client.DownloadFile(strUrlPicture, @”C:\logo.gif”); client.Dispose(); Die zweite Variante erlaubt etwas mehr Kontrolle. Das File wird zuerst in ein byte-Array geladen. string strUrlPicture =… Read More »