Resolved. The method was called recursively, creating the parameter and the expression and returned to himself. In this process the parameters were removed from memory, as they had already been used believed not to have problems. But they need to be kept in memory until the time of compilation. In this case I used a … Read more
This will create a new XElement under the Root node which is where I think you want it. xmlDoc.Root.Add( new XElement(“product”, new XElement(“name”, “456”), new XElement(“price”, “456”))); 0 solved C# problem in append items to XML document
The other answers have shown how you can (and should, IMO) do this without LINQ – but they’ve both still got the same problem that your original code does: you’re only checking whether the data set has any tables – it could have fewer than tableNo tables. I would suggest: public bool IsNullOrEmptyDataTable(DataSet objDataset, int … Read more
This part is pretty easy because you’re able to run LINQ queries on IEnumerable<T> – in other words, anything that you can do a foreach loop on is something that you can query. And there are a great many ways to do that. First, however, I’m assuming that you already know the schema for the … Read more
Single() already throws an InvalidOperationException if the result contains more than one element (or if it is empty). You were probably confusing it with First(), which doesn’t throw if there is more than one element. 2 solved Is there a stricter version of .Single()? [closed]
I’m not sure if this is what you need(it’s a random shot since your question is not complete): Dim orderedData = From d In collezione Order By d.Gruppo Group d By d.Gruppo Into g = Group From d In g Select New With { .withChildren = {d}. Union(g.Where(Function(c) c.Owner = d.Comp)) } Dim result = … Read more
You should group all person skills by person id, and then select only those groups, which contain both given category and sub category: unitOfWork.PersonSkillsRepository.GetAll() .GroupBy(p => p.PersonId) .Where(g => g.Any(p => p.IdCategory == ids.IdCategory) && g.Any(p => p.IdSubCategory == ids.IdSubCategory)) .Select(g => g.Key) For optimization, you can filter out skills which do not match any … Read more
A quick test shows that setting @jdweng’s purely LINQ solution 1X, a solution somewhat abusing LINQ to do indexing comes in at 7.4X and a solution using for comes in at 28.4X. (Ab)using LINQ with indexing: var c = Enumerable.Range(0, source[0].Length).Select(chpos => Enumerable.Range(0, source.Length).Select(si => source[si][chpos]).Join()).ToArray(); Using nested for loops: var sourcelen = source.Length; var … Read more
Start by breaking up your logic into separate operations rather than trying to write everything in one line. Compilers are smart cookies so they optimize things quite well, there’s no point making your code harder to read/understand: var facultySpecialties = specialty.faculty_specialties .Where(fs => fs.faculty.active) .ToList(); // Executes the query to retrieve faculty specialties. foreach(var facultySpecialty … Read more
Convert the list to a decimal list, and use something like the following : var list = new List<decimal> { 2512793, 119176, 83599, 45613, 43352 }; decimal sum = list.Sum(); var perc = list.Select(x => (x / sum) * 100); Alternatively, you can cast each value as decimal. Or Alternatively as @James Pointed out there … Read more
Basic stuff,learn it please List<int> result = myList.Select(x=>x.fld1).ToList(); 0 solved Use lambda expression to retrieve object array a field collection
string text = “yay blah blah blah blah woo woo yay yay yay.”; var words = Regex.Split(text, @”\W+”) .AsEnumerable() .GroupBy(w => w) .Where(g => g.Count() > 3) .Select(g => g.Key); words.ToList().ForEach(Console.WriteLine); Output: yay blah solved How to display words that appear more than ‘x’ times in a text? [closed]
Introduction This article will discuss how to use LINQ to hide a button if all the status values are “Paid”. LINQ is a powerful language-integrated query language that can be used to query and manipulate data in a variety of ways. We will look at how to use LINQ to check if all the status … Read more
You can use the LINQ All method. @if(!Model.PaymentList.All(f=>f.Status==”Paid”)) { <button>click me</button> } Or the Any method @if(Model.PaymentList.All(f=>f.Status!=”Paid”)) { <button>click me</button> } 1 solved Hiding button if all status is “Paid” using LINQ [closed]
I think you are looking for something like this class Program { static void Main(string[] args) { string attrs = “AAA,BBB,CCC,DDD”; List<Vehicle> vehiclesSort = new List<Vehicle>(); vehiclesSort.Add(new Vehicle(attrs)); vehiclesSort.Add(new Vehicle(“bbb”)); vehiclesSort = vehiclesSort.Where(o => o.attr.Contains(attrs)).ToList(); foreach (var VARIABLE in vehiclesSort) { Console.WriteLine(VARIABLE.attr); } } } public class Vehicle { public Vehicle(string attr1) { this.attr = … Read more