How to Convert ArrayList to List<int> in C#

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Hi

C#

for(int j=0;j<dt.Rows.Count;j++)
            {
                al.Add(Convert.ToInt16(dt.Rows[j].ToString().Substring(3,dt.Rows[j].ToString().Length-3)));
            }
 List<int> list = al.Cast<int>().ToList();

when convert it gives casting error.

Posted 4-Feb-15 21:08pm

basurajkumbhar

Updated 4-Feb-15 21:23pm

v3

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nagendrathecoder 5-Feb-15 3:14am

Have you looked in google?

BillWoodruff 5-Feb-15 12:05pm

Without knowing what Types are in the ArrayList, it's hard to consider the best strategy.

4 solutions

Solution 3

Ref.
http://www.dotnetperls.com/convert-arraylist-list[^]
http://stackoverflow.com/questions/4437118/what-is-the-best-way-to-cast-from-arraylist-to-list[^]

Posted 4-Feb-15 21:14pm

/\jmot

Solution 4

ref : www.dotnetperls.com/convert-arraylist-list

Posted 5-Feb-15 1:34am

Member 10702802

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DamithSL · Accepted Answer · 2015-02-04T21:14:00

C#

List<int> list = arrayList.Cast<int>().ToList();

if you have non integers in the array but still want integer list then try with

C#

List<int> integers = arrayList.OfType<int>().ToList();

or you items directly to a List of integers as below

C#

 List<int> list = new List<int>();
for(int j=0;j<dt.Rows.Count;j++)
            {
                list .Add(Convert.ToInt16(dt.Rows[j].ToString().Substring(3,dt.Rows[j].ToString().Length-3)));
            }

basurajkumbhar · Accepted Answer · 2015-02-10T20:53:00

for(int j=0;j<dt.rows.count;j++)>
            {
                al.Add(Convert.ToInt16(dt.Rows[j].ToString().Substring(3,dt.Rows[j].ToString().Length-3)));
	 list.Add(Convert.ToInt16(dt.Rows[j].ToString().Substring(3, dt.Rows[j].ToString().Length - 3)));
            }

i add that data table value in list and solve my problem..

Thanks for every body

How to Convert ArrayList to List<int> in C#

4 solutions

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