does not contain a definition for RemoveAll and no extension method 'RemoveAll' Accepting [Resolved]

Posted by Kasani007 under LINQ on 5/2/2016 | Points: 10 | Views : 8574 | Status : [Member] | Replies : 3

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'System.Collections.Generic.IList<Address>' does not contain a definition for 'RemoveAll' and no extension method 'RemoveAll' accepting a first argument of type 'System.Collections.Generic.IList<Address>' could be found (are you missing a using directive or an assembly reference?)

why the error is coming...and what to do to rectify it..?

thanks in advance

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Posted by: Sheonarayan on: 5/2/2016 [Administrator] HonoraryPlatinum | Points: 50

0	The reason is quite simple, IList collection object doesn't contain the RemoveAll method. To make this work change the definition to List like System.Collections.Generic.List<Address> addresses = new System.Collections.Generic.List<Address>(); addresses.RemoveAll(...); and this should work. Hope this helps. Regards, Sheo Narayan http://www.dotnetfunda.com Kasani007, if this helps please login to Mark As Answer. \| Alert Moderator

The reason is quite simple, IList collection object doesn't contain the RemoveAll method. To make this work change the definition to List like

System.Collections.Generic.List<Address> addresses = new System.Collections.Generic.List<Address>();
addresses.RemoveAll(...);

and this should work.

Hope this helps.

Regards,
Sheo Narayan
http://www.dotnetfunda.com

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Posted by: Rajnilari2015 on: 5/3/2016 [Member] [Microsoft_MVP] [MVP] Platinum | Points: 25

0	@Kasani007, I completely agree with Sheo Sir...However, you can simulate the situation as under public static void RemoveAll(IList<Addresses> list) { while(list.Count !=0) { list.RemoveAt(0); } } and use like static void Main(string[] args) { IList<Addresses> addr = new List<Addresses>(); //Loading dummy values Addresses objAddress = new Addresses(); objAddress.Id = 1; objAddress.Address = "Test Address1"; addr.Add(objAddress); Addresses objAddress2 = new Addresses(); objAddress2.Id = 2; objAddress2.Address = "Test Address2"; addr.Add(objAddress2); Addresses objAddress3 = new Addresses(); objAddress3.Id = 3; objAddress3.Address = "Test Address3"; addr.Add(objAddress3); RemoveAll(addr); } where public class Addresses { public long Id { get; set; } public string Address { get; set; } } -- Thanks & Regards, RNA Team Kasani007, if this helps please login to Mark As Answer. \| Alert Moderator

@Kasani007, I completely agree with Sheo Sir...However, you can simulate the situation as under

        public static void RemoveAll(IList<Addresses> list)
        {
            while(list.Count !=0)
            {
              list.RemoveAt(0);
             }
        }

and use like

 static void Main(string[] args)
        {
            IList<Addresses> addr = new List<Addresses>();
            //Loading dummy values
            Addresses objAddress = new Addresses();
            objAddress.Id = 1;
            objAddress.Address = "Test Address1";
            addr.Add(objAddress);

            Addresses objAddress2 = new Addresses();
            objAddress2.Id = 2;
            objAddress2.Address = "Test Address2";
            addr.Add(objAddress2);

            Addresses objAddress3 = new Addresses();
            objAddress3.Id = 3;
            objAddress3.Address = "Test Address3";
            addr.Add(objAddress3);

            RemoveAll(addr);

        }

where

public class Addresses
    {
        public long Id { get; set; }
        public string Address { get; set; }
    }

--
Thanks & Regards,
RNA Team

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Posted by: A2H on: 5/3/2016 [Member] [MVP] Silver | Points: 25

0	IList have a method called clear to remove all items. You can use that like given below IList<Addresses> addr = new List<Addresses>(); //Adding your recrods addr.Clear(); Complete code IList<Addresses> addr = new List<Addresses>(); //Loading dummy values Addresses objAddress = new Addresses(); objAddress.Id = 1; objAddress.Address = "Test Address1"; addr.Add(objAddress); Addresses objAddress2 = new Addresses(); objAddress2.Id = 2; objAddress2.Address = "Test Address2"; addr.Add(objAddress2); Addresses objAddress3 = new Addresses(); objAddress3.Id = 3; objAddress3.Address = "Test Address3"; addr.Add(objAddress3); addr.Clear(); You can check this link for more details https://msdn.microsoft.com/en-us/library/system.collections.ilist.clear(v=vs.110).aspx Thanks, A2H My Blog Kasani007, if this helps please login to Mark As Answer. \| Alert Moderator

IList have a method called clear to remove all items.

You can use that like given below

IList<Addresses> addr = new List<Addresses>();
                //Adding your recrods
                addr.Clear();

Complete code

 IList<Addresses> addr = new List<Addresses>();
                //Loading dummy values
                Addresses objAddress = new Addresses();
                objAddress.Id = 1;
                objAddress.Address = "Test Address1";
                addr.Add(objAddress);

                Addresses objAddress2 = new Addresses();
                objAddress2.Id = 2;
                objAddress2.Address = "Test Address2";
                addr.Add(objAddress2);

                Addresses objAddress3 = new Addresses();
                objAddress3.Id = 3;
                objAddress3.Address = "Test Address3";
                addr.Add(objAddress3);
                addr.Clear();

You can check this link for more details
https://msdn.microsoft.com/en-us/library/system.collections.ilist.clear(v=vs.110).aspx

Thanks,
A2H
My Blog

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