List in List c# .NET question

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I have the following question.
Is it possible to ad an list into a list?

Wrapper class

C#

public List<Analyses> HaalAnalyseOp(DataSource requestedDataSource)
        {
            IDataSource source;

            switch (requestedDataSource)
            {
                case DataSource.Access:
                    source = new AccessDataSource();
                    break;
                case DataSource.MsSql:
                    source = new MsSqlDataSource();
                    break;
                case DataSource.WebService:
                    source = new WebServiceDataSource();
                    break;
                default:
                    throw new ArgumentOutOfRangeException("requestedDataSource");
            }

            return source.GetAnalyses();
        }

        public class MsSqlDataSource : IDataSource
        {
            public List<Analyses> GetAnalyses()
            {
                //code to get MsSql data
                throw new NotImplementedException();
            }
        }

        public class AccessDataSource : IDataSource
        {
            public List<Analyses> GetAnalyses()
            {
                var lijst = new List<Analyses>();
                lijst.Add(new Analyses() { Stappen = "OdbcDataAdapter da = new OdbcDataAdapter();" });                                      // list 1
                return lijst;
            }
        }

        public class WebServiceDataSource : IDataSource
        {
            public List<Analyses> GetAnalyses()
            {
                //code to get WebService data
                throw new NotImplementedException();
            }
        }
    }

IDataSource class

C#

public class Analyses
    {
        public List<string> Stappen { get; set; }          //List 2
    }

    public interface IDataSource
    {
        List<Analyses> GetAnalyses();
    }

Posted 13-Jan-14 23:15pm

Member 10380897

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Comments

CPallini 14-Jan-14 5:18am

Of course it is possible. What is the problem (if any) with your code?

Member 10380897 14-Jan-14 5:41am

I get an error because the stappen field is an List(list 2). I can't put that list into the lijst list. (list 1)

Cannot implicitly convert type 'string' to 'System.Collections.Generic.List'

Maarten Kools 14-Jan-14 5:49am

lijst.Add(new Analyses() { Stappen = "OdbcDataAdapter da = new OdbcDataAdapter();" });
Stappen is a list, not a string. So instead of Stappen = "OdbcDataAdapter da = new OdbcDataAdapter();" do Stappen = new List<string> { "OdbcDataAdapter da = new OdbcDataAdapter();"}

[edit]sometimes I get so fed up with CP's tendency to change brackets! Hope you're not getting spammed with email because of this[/edit]

Member 10380897 14-Jan-14 6:19am

Ok thx it works. Now i have a sub question related to the previous one.

This is my class structure:

Dal
| |
| |__ Webserver (Database type 1)
| |__ Own Database (Database type 2)
|
|
|__ Wrapper (Converts the data for database one or two)

The Wrapper returns the following list to the DAL for my Access database. (String format)

<pre lang="c#">
public class AccessDataSource : IDataSource
{
public List<analyses> GetAnalyses()
{
var lijst = new List<analyses>();
lijst.Add(new Analyses()
{
Stappen = new List<string> { "OdbcDataAdapter da = new OdbcDataAdapter();",
"DataSet ds = new DataSet();",
"DataTable dt = new DataTable();",
"da.SelectCommand = new OdbcCommand(@\"SELECT * FROM Recepten WHERE id = \" + Id + \"\", connectie);",
"da.Fill(ds, \"AnalysesID\");",
"dt = ds.Tables[\"AnalysesID\"]"
}
});
return lijst;
}
}
</pre>

How can i execute the list in my dal to select data from my access file?

Suk@nta 14-Jan-14 5:51am

yes u cannot convert a string to System.Collections.Generic.List
u have to assign a list type.

Member 10380897 14-Jan-14 6:29am

Ok but how can i do that?

2 solutions

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TrushnaK · Answer 1 · 2014-01-14T00:18:00

Solution 3

Use List.AddRange(collection As IEnumerable(Of T)) method.

refer below links:-
http://stackoverflow.com/questions/2369673/how-to-add-list-to-a-list-in-asp-net[^]
http://stackoverflow.com/questions/5671493/adding-listt-add-another-list[^]

Posted 14-Jan-14 0:18am

TrushnaK

Suk@nta · Answer 2 · 2014-01-13T23:55:00

C#

List<list><int>> list = new List<list><int>>();
    var rand = new Random();
    for (int i = 0; i < 10; i++)
    {
        List<int> sublist = new List<int>();
        int top = rand.Next(1, 15);
        for (int v = 0; v < top; v++)
        {
        sublist.Add(rand.Next(1, 5));
        }
        list.Add(sublist);

this is the small example to how we can list inside list
let me know if its help or not