Saturday, August 6, 2011

How to convert IEnumerable to Html table in asp.net




In this post I will show how to convert IEnumerable to string (Html table).Assume you have a customer class which has three properties named FirstName,LastName and Age.Now,you want to display customer collection on UI.
For this I have created following method which retrives propertyname and value dynamically (using reflection) and return result as string
public static string ToHtmlTable(IEnumerable list, string tableSyle, string headerStyle, string rowStyle, string alternateRowStyle) 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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></title>
    <style type="text/css">
        .headerStyle
        {
            background-color: #abc;
        }
        .rowStyle
        {
            background-color: #def;
        }
        .alternateRowStyle
        {
            background-color: #aabbcc;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div id="table" runat="server">
        </div>
    </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        table.InnerHtml = ToHtmlTable(EmployeeDAL.Employees, "", "headerStyle", "rowStyle", "alternateRowStyle");
    }

    public static string ToHtmlTable<T>(IEnumerable<T> list, string tableSyle, string headerStyle, string rowStyle, string alternateRowStyle)
    {

        var result = new StringBuilder();
        if (String.IsNullOrEmpty(tableSyle))
        {
            result.Append("<table id=\"" + typeof(T).Name + "Table\">");
        }
        else
        {
            result.Append("<table id=\"" + typeof(T).Name + "Table\" class=\"" + tableSyle + "\">");
        }

        var propertyArray = typeof(T).GetProperties();
        foreach (var prop in propertyArray)
        {
            if (String.IsNullOrEmpty(headerStyle))
            {
                result.AppendFormat("<th>{0}</th>", prop.Name);
            }
            else
            {
                result.AppendFormat("<th class=\"{0}\">{1}</th>", headerStyle, prop.Name);
            }
        }

        for (int i = 0; i < list.Count(); i++)
        {
            if (!String.IsNullOrEmpty(rowStyle) && !String.IsNullOrEmpty(alternateRowStyle))
            {
                result.AppendFormat("<tr class=\"{0}\">", i % 2 == 0 ? rowStyle : alternateRowStyle);
            }
            else
            {
                result.AppendFormat("<tr>");
            }

            foreach (var prop in propertyArray)
            {
                object value = prop.GetValue(list.ElementAt(i), null);
                result.AppendFormat("<td>{0}</td>", value ?? String.Empty);
            }
            result.AppendLine("</tr>");
        }
        result.Append("</table>");
        return result.ToString();
    }
}

public class Employee
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }

}
public class EmployeeDAL
{
    public static List<Employee> Employees
    {
        get
        {
            return new List<Employee>()
                       {
                           new Employee(){FirstName = "F001",LastName = "L001",Age = 31},
                           new Employee(){FirstName = "F002",LastName = "L002",Age = 32},
                           new Employee(){FirstName = "F003",LastName = "L003",Age = 33},
                           new Employee(){FirstName = "F004",LastName = "L004",Age = 34},
                       };
        }
    }
}

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