Hi Guys, sometimes we need to sort the data dynamically with dynamic column, suppose we are sowing data in grid and after click on column data should be sort, on first click it should be descending and on again click it should be ascending etc. We know that there are no any technique provide by Microsoft so we can resolve this problem to make an Extension Method as follow.
using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Text; using System.Threading.Tasks; namespace DynamicColumnOrderByLinq { publicstaticclassExtMethod { publicstaticIQueryable<TEntity> CustumOrderBy<TEntity>(thisIQueryable<TEntity> source, string ColName, bool desc) { if (!string.IsNullOrEmpty(ColName)) { string command = desc ? "OrderByDescending" : "OrderBy"; var type = typeof(TEntity); var property = type.GetProperty(ColName); var parameter = Expression.Parameter(type, "p"); var propertyAccess = Expression.MakeMemberAccess(parameter, property); var orderByExpression = Expression.Lambda(propertyAccess, parameter); var resultExpression = Expression.Call(typeof(Queryable), command, newType[] { type, property.PropertyType }, source.Expression, Expression.Quote(orderByExpression)); return source.Provider.CreateQuery<TEntity>(resultExpression); } else { return source; } } } } |
Suppose we have a table of Customer as bellow..
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace DynamicColumnOrderByLinq { publicclassCustomerList { publicList<Customer> MyCustomer() { List<Customer> lst = newList<Customer>(){ newCustomer(){id=1,FirstName="Dilip",LastName="Singh",Email="dilip@gmail.com",Pass="dilip@347",CreateDate=DateTime.Now}, newCustomer(){id=2,FirstName="Vipul",LastName="Bhatt",Email="vipul@gmail.com",Pass="Vipul@347",CreateDate=DateTime.Now}, newCustomer(){id=3,FirstName="Ravi",LastName="Pratap",Email="ravi@gmail.com",Pass="ravi@347",CreateDate=DateTime.Now}, newCustomer(){id=4,FirstName="Pankaj",LastName="Singh",Email="pankaj@gmail.com",Pass="pankaj@347",CreateDate=DateTime.Now}, newCustomer(){id=5,FirstName="Anil",LastName="Singh",Email="anil@gmail.com",Pass="anil@347",CreateDate=DateTime.Now}, newCustomer(){id=6,FirstName="Param",LastName="Tripathi",Email="param@gmail.com",Pass="param@347",CreateDate=DateTime.Now}, newCustomer(){id=7,FirstName="Avnish",LastName="Dubey",Email="avnish@gmail.com",Pass="avnish@347",CreateDate=DateTime.Now} }; return lst; } } publicclassCustomer { publicint id { set; get; } publicstring FirstName { set; get; } publicstring LastName { set; get; } publicstring Email { set; get; } publicstring Pass { set; get; } publicDateTime CreateDate { set; get; } } } |
Now on following code I am trying to sort data according to column and order by descending and ascending.
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using DynamicColumnOrderByLinq; namespace DynamicColumnOrderByLinq { classProgram { publicstaticvoid Main(string[] args) { foreach (var v in cust("FirstName", true))// for ascending false and descending true { Console.WriteLine("ID= "+v.id + " FirstName ="+v.FirstName+ " LastName = "+ v.LastName +" Email = "+v.Email+" Pass = "+v.Pass+ " CreateDate ="+v.CreateDate); } } publicstaticList<Customer> cust(string ColumnName,bool OrderBy) { CustomerList oCust = newCustomerList(); List<Customer> lst = (from x in oCust.MyCustomer().AsQueryable() select x).CustumOrderBy(ColumnName, OrderBy).ToList(); return lst; } } } |
Note: If you want to sort descending order by column then pass parameter true and if you want to sort ascending order by column then pass false.
For descending
foreach (var v in cust("FirstName", true))// for descending true { Console.WriteLine("ID= "+v.id + " FirstName ="+v.FirstName+ " LastName = "+ v.LastName +" Email = "+v.Email+" Pass = "+v.Pass+ " CreateDate ="+v.CreateDate); } |
For ascending
foreach (var v in cust("FirstName", false))// for ascending true { Console.WriteLine("ID= "+v.id + " FirstName ="+v.FirstName+ " LastName = "+ v.LastName +" Email = "+v.Email+" Pass = "+v.Pass+ " CreateDate ="+v.CreateDate); } |
You can down load code from here..