foreach statement cannot operate on on variables of type 'object' because object does not contain a public definition for GetEnumerator

Question

User-1410783915 posted

I want to create a list of objects, store them in session, and then get them out of session and finally iterate through the list which I retrieve from my session variable.
This appears to be working great, however when I try to iterate through my C# list, I get this compiler error message:

foreach statement cannot operate on on variables of type 'object' because object does not contain a public definition for GetEnumerator

The error occurs in my method Button1_Click method at the bottom of this post. Can someone tell me how I can fix this? My code is below.

Public class Packet
{
public string id;
public string name;

public string ID
{
get { return id;}
}

public string Name
{
get { return name;}
}
}

protected void Page_Load(object sender, EventArgs e)
{
Packet PackageOne = new Packet();
PackageOne.id = "01";
PackageOne.name ="Jeff";

Packet PackageTwo = new Packet();
PackageTwo.id = "02";
PackageTwo.name ="Mary";

List<Packet> list = new List<Packet>();
list.Add(PackageOne);
list.Add(Theirs);

HttpContext.Current.Session["TheList"] = list;

}

protected void Button1_Click(object sender, EventArgs e)
{
var Savedlist = Session["TheList"];
foreach (var item in Savedlist) // Compiler : foreach statement cannot operate on on variables of type 'object' because object does not contain a
{ // public definition for GetEnumerator

}
}

Answer 1

User-286291038 posted

Hi Gleeming,

Please try casting the session value into a List<Packet>

ie,

var Savedlist = (List<Packet>)Session["TheList"];

Answer 2

User36583972 posted

Hi Gleeming,

From your description, You can try the following three methods.

      protected void Button1_Click(object sender, EventArgs e)
        {
            //one
            var Savedlist = Session["TheList"];
            foreach (var item in (dynamic)Savedlist) // Compiler : foreach statement cannot operate on on variables of type 'object' because object does not contain a 
            {
                var item2 = (Packet)item;
                // public definition for GetEnumerator
                Response.Write(item2.ID + "< 1 >" + item2.name + "  <br />");
            }
            //two
            var Savedlist2 = (List<Packet>)Session["TheList"];
            foreach (var item in Savedlist2) // Compiler : foreach statement cannot operate on on variables of type 'object' because object does not contain a 
            {
                Response.Write(item.ID + "< 2 >" + item.name + "  <br />");
                // public definition for GetEnumerator
            }
            //three
            var Savedlist3 = Session["TheList"];
            foreach (var item in (IEnumerable)Savedlist3)
            {
                var item3 = (Packet)item;
                // public definition for GetEnumerator
                Response.Write(item3.ID + "< 3 >" + item3.name + "  <br />");
            }
        }

Best Regards,

Yohann Lu