In SQL Server it's easy and we are familiar to sort orders on different columns but when it comes to Linq to SQL or Lamda expression we stuck how to sort the records, it is because we are experienced much. So let's discuss some daily use ordering of records with examples.
1. Suppose we have an Employee table and want to sort on columns say "EmployeeName" in ascending order then
MyDataContext db = new MyDataContext();
List<Employee> employees = (from emp in db.Employees
orderby emp.EmployeeName
select emp).ToList<Employee>();
// OR
List<Employee> employees = db.Employees
.OrderBy(x => x.EmployeeName)ToList<Employee>();
2. Suppose we want to sort on columns say "JoiningDate " in descending order then
List<Employee> employees = (from emp in db.Employees
orderby emp.JoiningDate descending
select emp).ToList<Employee>();
// OR
List<Employee> employees = db.Employees
.OrderByDescending(x => x.JoiningDate).ToList<Employee>();
3. Suppose we want to sort on different columns say "EmployeeName" and "City" in ascending order then
List<Employee> employees = (from emp in db.Employees
orderby emp.EmployeeName, emp.City
select emp).ToList<Employee>();
// OR
List<Employee> employees = db.Employees
.OrderBy(x => x.EmployeeName)
.ThenBy(x => x.City).ToList<Employee>();
4. Suppose we want to add one more ordering on column "JoiningDate" in descending order then
List<Employee> employees = (from emp in db.Employees
orderby emp.EmployeeName, emp.City, emp.JoiningDate descending
select emp).ToList<Employee>();
// OR
List<Employee> employees = db.Employees
.OrderBy(x => x.EmployeeName)
.ThenBy(x => x.City)
.ThenByDescending(x => x.JoiningDate).ToList<Employee>();
We can also sort records by using new, see this
var employees = db.Employees.OrderBy( x => new { x.EmployeeName, x.City, x........});
we can use here as many columns as we many we want by separating with comma (,).
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By Mike .Net On 30 Jan, 13 Viewed: 4,736 |
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