Based on the additional information, the problem is that you are not passing the right arguments to ToDictionary. It takes two lambdas, not a lambda and a List<>. Here’s the first step to fixed code: dt.AsEnumerable().ToDictionary( dtRow => dtRow.Field<Int64>(“CodeVal_1”), dtRow => new List<string> { dtRow.Field<string>(“CodeVal_2”), dtRow.Field<string>(“CountryCode”) } ); EDIT: fixed using wrong version of ToDictionary. … Read more
Try this: return ( from div in strExport.Split(chrDivSep) from item in div.Split(chrItemSep) where String.Equals(item.Split(chrCoupleSep)[0], “table”, StringComparison.OrdinalIgnoreCase) ).Any(); solved Translate to LINQ [closed]
Try looking at the Math.NET Linq Algebra library. It can do what you are asking. 5 solved Simultaneous equations in C# LINQ [closed]
you can order by the key like this : var ordered = lstValuesTemp.OrderBy(v => v.Key); or you can order with fonction declare the function like this: public static string CustomOrder(KeyValuePair<string, List<string>> item) { //TODO: add some logic that return a string to compare this item } and than call thia function: var ordered = lstValuesTemp.OrderBy(CustomOrder); … Read more
Since you have a List<object> that actually contains List<List<Player>> and you want to get a list of players in one big list. Unfortunately for some external reason you are unable to change the API to give you sensibly typed data, you need to go through a couple of hoops. So given this: List<object> players = … Read more
Your question show complete lack of effort to investigate the matter. LINQ = Language INtegrated Queries; It’s language construct that allows you to query objects / databases / other in a manner similar to SQL. Start by reading some guide like this 4 solved What is LINQ in following code?
Your resource is not a list but an object. Better implementation would be something like this. [HttpGet(“{id}”)] public IActionResult Get(string id) { using (var unitOfWork = new UnitOfWork(_db)) { var r = unitOfWork.Resources.Get(id); if (r == null) { return NotFound(); } return Ok(ConvertResourceModel(r)); } } 0 solved Can’t use Count() in C#
How about: myList.RemoveAt(myList.indexOf(0)); And more generalized version would be: void RemoveFirst<T>(List<T> list, T item) { var indexOfItem = list.IndexOf(item); if(indexOfItem != -1) list.RemoveAt(indexOfItem); } Note: What .Remove() does shold be crystal clear to everyone. But when one wants to see the logic behind it, I think my answer still has some value. 14 solved Removing … Read more
If you want to convert this to the method syntax version, you can do this step by step. I like to start at the end and work through to the beginning: select to Select defines the source: .Select(g => g.OrderByDescending(s => s.MeasureDate).FirstOrDefault()); group is GroupBy: .GroupBy(s => s.SensorUnitId) .Select(g => g.OrderByDescending(s => s.MeasureDate).FirstOrDefault()); from the … Read more
The snippet below will work, using standard LINQ: var nearestBelow = newValue – array.Where(n => n <= newValue) .Min(n => newValue – n); solved C# Nearest Low Value in array [closed]
The locally scoped winTemp variable is hiding the instance variable (inside readXML() method). Thus winTemp instance variable does not get set at all and holds the default value, i.e. 0, by the time of addition. solved Evaluating equations during “new EXlement”
test this. foreach (var item in query_1.GroupBy(x=> x.Name).Select(x=> x.First())) { MultipleTableQueryResultVM objcvm = new MultipleTableQueryResultVM(); objcvm.firstName = item.Name; objcvm.CommerceTransID = item.TransID; objcvm.Type = item.Tipo; objcvm.Name = item.Nombre; VMList.Add(objcvm); } 1 solved Helping grouping by in LINQ [closed]
This is the same as doing two separated operations: var numbers = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; var biggerThanThree = numbers.Where(x => x > 3); // [4, 5, 6, 7, 8, 9, 10] var smallerThanSeven = biggerThanThree.Where(x => x < 7); // [4, 5, 6] I’m … Read more
In C#, what does a call to Sort with two parameters in brackets mean? You have this line of code: nodes.Sort((x, y) => distances[x] – distances[y]); You are not passing two parameters to the sort method but you are passing one parameter which is a delegate that takes 2 parameters. You are essentially doing the … Read more
You need to add a property ( i called it Others) to Employee to store the list employees .GroupBy(x => x.EmpID) .Select(g => { var byPres = g.OrderByDescending(x => x.DateofPresentation).ToArray(); var e = byPres.First(); e.Others = byPres.Skip(1).ToList(); return e; }) see demo https://dotnetfiddle.net/kRiMds 0 solved Move duplicates of a list within the list c#