Problem fetching the value of a complex List in Eval method

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siddharth292...

Member

1 Points

3 Posts

Problem fetching the value of a complex List in Eval method

Sep 12, 2019 07:01 PM|siddharth2929|LINK

So I have a class called Student -

{

int rollNo {get; set;}

string name {get; set;}

int branchId {get; set;}

List<Branch> studentBranchName {get; set;}

}

And the class Branch -

{

int branchId {get; set;}

string branchName {get; set;}

}

The studentBranchName would contain a integer value which will be related to the branchName in class Branch.

In my aspx page, I have a repeater whose data source is associated with the Student class. I want to display the branch name in the Eval method inside the repeater.

How can I do that?

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Yang Shen

Contributor

2040 Points

651 Posts

Re: Problem fetching the value of a complex List in Eval method

Sep 13, 2019 03:24 AM|Yang Shen|LINK

Hi siddharth,

siddharth2929
In my aspx page, I have a repeater whose data source is associated with the Student class. I want to display the branch name in the Eval method inside the repeater.

This description might be a little confusing, but is below this what you want?

If so, please refer to below code:

ASPX:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <table border="1" style="border-collapse: collapse">
                <tr>
                    <td>rollNo</td>
                    <td>name</td>
                    <td>branchName</td>

                </tr>
                <asp:Repeater ID="Repeater2" runat="server" OnItemDataBound="Repeater2_ItemDataBound">
                    <ItemTemplate>
                        <tr>
                            <td>
                                <asp:Label ID="Label4" runat="server" Text='<%#Eval("rollNo") %>'></asp:Label></td>
                            <td>
                                <asp:Label ID="Label2" runat="server" Text='<%#Eval("name") %>'></asp:Label></td>
                            <td>
                                <asp:Label ID="Label1" runat="server" Text='<%#Eval("studentBranchName") %>'></asp:Label>
                            </td>
                        </tr>
                    </ItemTemplate>
                </asp:Repeater>
            </table>
        </div>
    </form>
</body>
</html>

.CS:

List<Student> slist = new List<Student>();
        protected void Page_Load(object sender, EventArgs e)
        {
            List<Branch> blist = new List<Branch>();
            for (int i = 0; i < 5; i++)
            {
                Branch branch = new Branch()
                {
                    branchId = i,
                    branchName = "a" + i.ToString()
                };
                blist.Add(branch);
            }
            for (int j = 0; j < 5; j++)
            {
                Student student = new Student()
                {
                    rollNo = j,
                    name = "Sam" + j.ToString(),
                    branchId = 1,
                    studentBranchName = blist,
                };
                slist.Add(student);
            }



            Repeater2.DataSource = slist;
            Repeater2.DataBind();

        }

        protected void Repeater2_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            Repeater repeater1 = e.Item.FindControl("Repeater1") as Repeater;
            Label label1 = e.Item.FindControl("Label4") as Label;
            Label branchLabel = e.Item.FindControl("Label1") as Label;
            List<Branch> testList = slist.
    Where(x => x.rollNo == Convert.ToInt32(label1.Text.ToString())).Select(i => i.studentBranchName).FirstOrDefault().ToList();
            var branchName = string.Join(",", testList.Select(i => i.branchName).ToArray());
            branchLabel.Text = branchName;
        }

        public class Student
        {
            public int rollNo { get; set; }
            public string name { get; set; }
            public int branchId { get; set; }
            public List<Branch> studentBranchName { get; set; }
        }

        public class Branch
        {
            public int branchId { get; set; }
            public string branchName { get; set; }
        }

Hope this would help you.

Best Regard,

Yang Shen