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DynamicRelation Entities Fetching in older LLBLGen. From Delegate to Lambda. Elegates play a tremendously important role in developing applications for the .NET Framework, especially when using C# or Visual Basic. Events, a special application of delegates, are used all over the framework. And the application and possibilities of delegates has only grown over time. C# 2.0 introduced the concept of anonymous methods and C# 3.0 and VB 9 take anonymous methods to the next level with lambda expressions.
This article reviews the evolution of delegates and examines possibilities and syntax of delegates and lambdas in .NET 3.5. Lambda expressions are the new hot thing in .NET 3.5. In this article I will look at some very basic code samples and take you from old school programming techniques to using lambda expressions in your code. The code in the application is functionally correct; it works and life is good. However, in a lot of cases you'll find that just filtering one way is not enough. What Is a Delegate? Delegates, Anonymous Methods and Lambda Expressions in C# Delegates in C# cause a fair amount of confusion, but with the introduction of LINQ to SQL and the profilic use of the Lambda Expression operator (=>) that it has foisted on an unprepared batch of beginners, an understanding of how these two items are related, together with Anonymous Methods becomes more important.
Most definitions of Delegates that you find start off with comparing them to "function pointers in C or C++", which is great if you ever worked with those languages and understood them, but not helpful to new programmers. Here's my attempt at simplifying the various concepts. Delegates I'll start with a string replacement problem, which I shall borrow from a question posted to the asp.net forums which concerned the Regex.Replace() methods. !! With <a href="~/directory/target.aspx">TARGET</a> I know - you're thinking "That's great! 1. Finding and matching the pattern !! Regex r = new Regex("!!
Starts with !! Public delegate string MatchEvaluator( Match match m.Groups[1].Value, Fixed: Unexpected exception occurred during upgrade engine operation: Not able to bind to the source : Visual Basic Interop and Upgrade : Visual Basic : MSDN Forums. We were able to resolve this problem. It seems even after applying SP1 for Visual Basic Express 2005 the problem may still occur. I have not been able to reproduce the problem here so far but the solution that has worked is to add the registry entries for the upgrade tool that would normally appear on a standard Visual Basic 2005 or Visual Studio 2005 installation.
If you're still seeing this exception you can simply take the registry entries below and save them to a file on your machine with a .reg extension. Then as an adminstartor on the machine you can double click on the file from Windows Explorer and this will import the settings into the registry. Please as always take care when editing or importing anything into your registry. If after doing this you are still seeing the problem please feel free to contact me directly at JohnHart at Microsoft.com. Scott Hanselman's Computer Zen - Scott Hanselman's 2007 Ultimate ...