Dictionary in c#

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Dictionary in c#

Posts under the topic: Dictionary in c#

Posted: 10/22/2010

mohit kumar

2237 points Contributor

Joined on: 9/24/2009
Posts: 172

Hello Experts,

I am binding a dropdownlist from Dictionary but i didn't get the output which I want.Kindly take a look-

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestQuestion.aspx.cs" Inherits="WebProjects.TestQuestion" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="ddlDate" runat="server" ></asp:DropDownList>
    </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Web.UI;

namespace WebProjects
{
    public partial class TestQuestion : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ddlDate.DataSource = GetDate();
            ddlDate.DataBind();
            
        }
        private Dictionary<string,int> GetDate()
        {
            Dictionary<string, int> date = new Dictionary<string, int>();
            for (int i = 1; i <= 31; i++)
            {
                date.Add(i.ToString(),i);
            }
            return date;
        }
    }
}

output -

But I want only "1" in dropdownlist. How I Can use DataTextField and DataSourceID??

tags Dictionary in c#

Posted: 10/22/2010

Hajan Selmani

8505 points Professional

Joined on: 5/3/2010
Posts: 391

Answered

Rewrite it like this:

        protected void Page_Load(object sender, EventArgs e)
        { 
            ddlDate.DataSource = GetDate();
            ddlDate.DataValueField = "Key";
            ddlDate.DataTextField = "Value";
            ddlDate.DataBind();
        }
        private Dictionary<string, int> GetDate()
        {
            Dictionary<string, int> date = new Dictionary<string, int>();
            for (int i = 1; i <= 31; i++)
            {
                date.Add(i.ToString(), i);
            }
            return date;
        }

I've only modified the Page_Load method where I've added ddlDate.DataValueField="Key" and ddlDate.DataTextField="Value" ;) - in order to tell DropDownList which one is Value and which Text.

Hope this helps.

Don't forget to Mark As Answer the answers that helped you solve your issue

Posted: 10/22/2010

mohit kumar

2237 points Contributor

Joined on: 9/24/2009
Posts: 172

hajan said:
user="Hajan Selmani"]I've only modified the Page_Load method where I've added ddlDate.DataValueField="Key" and ddlDate.DataTextField="Value" ;) - in order to tell DropDownList which one is Value and which Text.

Thank you Hajan. Its working

Posted: 10/22/2010

Hajan Selmani

8505 points Professional

Joined on: 5/3/2010
Posts: 391

mohit said:
user="mohit kumar"]

hajan said:
user="Hajan Selmani"]I've only modified the Page_Load method where I've added ddlDate.DataValueField="Key" and ddlDate.DataTextField="Value" ;) - in order to tell DropDownList which one is Value and which Text.
Thank you Hajan. Its working
May I know why did you create instance of dictionary in page load method as I am returning dictionary from GetData method.Don't you think that its wasting of memory

Remove it :).

I've just written the code quite fast and forgot to remove the additional instance which is not needed at all.

The post is edited now ;).

Don't forget to Mark As Answer the answers that helped you solve your issue

Posted: 10/22/2010

mohit kumar

2237 points Contributor

Joined on: 9/24/2009
Posts: 172

In this situation I am binding from Dictionary.But if I am binding data from database(assume ID and Value are two columns ).So what is the syntax of DataTextField?

Posted: 10/22/2010

Hajan Selmani

8505 points Professional

Joined on: 5/3/2010
Posts: 391

mohit said:
user="mohit kumar"]
lol..I am also gonna edit my reply:)

Better! Becuase adding unnecessary additionan LINE to your reply is waste of memory space in the CodeASP.NET Community

Don't forget to Mark As Answer the answers that helped you solve your issue

Posted: 10/22/2010

mohit kumar

2237 points Contributor

Joined on: 9/24/2009
Posts: 172

hajan said:
user="Hajan Selmani"]Better! Becuase adding unnecessary additionan LINE to your reply is waste of memory space in the CodeASP.NET Community

Nice.Yes Hajan I will take care of it

Posted: 10/22/2010

Vincent Maverick Durano

8338 points Professional

Joined on: 4/15/2009
Posts: 424

Answered

mohit said:
user="mohit kumar"]But if I am binding data from database(assume ID and Value are two columns ).So what is the syntax of DataTextField?

Just set the database column field as the DataTextField. Check this out: Binding DropDownList, ListBox and CheckBoxList Control the ADO.NET way.

Vincent Maverick Durano, MVP

Posted: 10/22/2010

santhosh Reddy

50 points Lurker

Joined on: 10/22/2010
Posts: 5

Answered

If you want to show dates in DropDownList, you can also do it this way

ddlDate.DataSource = Enumerable.Range(1, 31);
ddlDate.DataBind();

Posted: 10/25/2010

mohit kumar

2237 points Contributor

Joined on: 9/24/2009
Posts: 172

Vinz said:
user="Vincent Maverick Durano"]Just set the database column field as the DataTextField. Check this out: Binding DropDownList, ListBox and CheckBoxList Control the ADO.NET way.

Thank you Vinz for such a nice blog

I have bookmarked too.

Posted: 10/25/2010

mohit kumar

2237 points Contributor

Joined on: 9/24/2009
Posts: 172

Thanks Santhosh

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