If you build the expression incrementally you can do this. Generally easier using expressions rather than comprehension expressions: var x = widgets.Where(w => w.Name.Contains(“xyz”)); if (flag) { x = x.OrderBy(w => w.property); } else { x = x.OrderByDescending(w => w.property); } (Assuming the Widget’s property is basis of sort since you don’t list one.)
This is more like an extension to @Alex’s answer. Step 1 : Set the connection property of your .dbml file to “none”. Step 2 : Create a new separate partial class with the same name as that of the existing partial class for the .dbml file. And set the connectionString property by using the parameterless … Read more
File.WriteAllLines(“myfile.txt”, dictionary.Select(x => “[” + x.Key + ” ” + x.Value + “]”).ToArray()); (And if you’re using .NET4 then you can omit the final ToArray call.)
The fundamental question here is how to project a DateTime instance into a week of year value. This can be done using by calling Calendar.GetWeekOfYear. So define the projection: Func<DateTime, int> weekProjector = d => CultureInfo.CurrentCulture.Calendar.GetWeekOfYear( d, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Sunday); You can configure exactly how the “week number” is determined by tweaking the parameters in the … Read more
Meh, why make it overcomplicated? This is the simplest way. var indexAtMax = scores.ToList().IndexOf(scores.Max()); Yeah, you could make an extension method to use less memory, but unless you’re dealing with huge arrays, you will never notice the difference.
LINQ var lastFiveProducts = (from p in products orderby p.ProductDate descending select p).Take(5); Lambda var lastFiveProducts = products.OrderByDescending(p => p.ProductDate).Take(5); Which ever you prefer.
The error you receive is from another method than the one you show here. It’s a method that takes a parameter with the name “source”. In your Visual Studio Options dialog, disable “Just my code”, disable “Step over properties and operators” and enable “Enable .NET Framework source stepping”. Make sure the .NET symbols can be … Read more
cleaner way to do this is using foreach foreach(var item in li.Where(w => w.name ==”di”)) { item.age=10; }
This is a guess, but I think your anonymous type might be attempting to duck-type to an enum when you’ve got more than two queries. If that’s happening, then you’ll get this complaint about not implementing IConvertible, as enum implements IConvertible, and your anonymous type (now derrived from enum) does not implement the interface.