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?
Here is what is doing this piece of LinQ : The code is using the Panels Entity set of you dbContext, that’s mean the Panels table in your database. Then, you are including an Invoice Entity, because it is part of your Panels one. It is most likely another table with a relation with Panels. … Read more
You probably don’t want to return an exception from that method. It could use a void return type instead. For example: private void button1_Click(object sender, EventArgs e) { Student student = new Student();//set up student obj… string city = “Foo”; searchCity(student, city); } public void searchCity(Student student, string searchCity) { //Do your search… //set the … Read more
Use OrderBy for the ordering, and First or possibly FirstOrDefault for the equivalent of TOP 1: var session = db.Sessions.OrderBy(x => x.StartTime).FirstOrDefault(); if (session != null) { // Use the session } else { // There weren’t any sessions } You could use a query expression for the first part, but it seems pretty pointless … Read more
This shouldn’t be the case. from wp in context.WorkPanels select wp; is equivalent to context.WorkPanels.Select(wp => wp);. The MS implementations of Select (Enumerable.Select / Queryable.Select) never return null. There must be something else wrong somewhere else. 4 solved Why null is returned?
Rather than using ToString, try string.Format. Something like: var query = (from e in Employees let month = e.BirthDate.GetValueOrDefault() let birthmonth = string.Format(“{0:MMMM}”, month) select birthmonth); query.Dump(); This seems to work from my local testing, although it is not included as part of the SQL query. 0 solved Printing Month Name in Linq
You could use: var total = dbo.PrecisionArchive.Where(p => p.AgencySourceId == 7) .Where(p => p.EventType == “R” || p.EventType == “ONS”) .Select(p => p.SampleDateTime) .Distinct() .Count(); 1 solved How to convert SQL query into LINQ?
It looks like you are trying to get a count of all users who registered on a certain day. If so, I think you are best off using the group keyword to group together all users by registration date. You can then create a new anonymous type to contain by the date, and the count, … Read more