Reader Level:
ARTICLE

Select Data Using Spatial Types Via EDF Framework 5.0

Posted by Vijay Prativadi Articles | .NET 4.5 December 16, 2012
Today, in this article let’s play around with one of the interesting and most useful concepts in Entity Data Model Framework 5.0.
  • 0
  • 0
  • 2589

Introduction
 
Today, in this article let's play around with one of the interesting and most useful concepts in Entity Data Model Framework 5.0.

Question: What is select data using enums via EDM Framework 5.0?
 
In simple terms "It provides flexibility to pull data from using spatial types using the Entity Framework 5.0".
 
Step 1: Design of tblDepartments looks like this:

Table-in-SQL-Server.jpg

Step 2: Create a new web application:

New-Project-in-SQL-Server.jpg

Step 3: Create a new data entity with Entity Framework 5.0:

Entity-framwork-in-SQL-Server.jpg

Step 4: The complete code of WebForm1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="SpatialTypeEFApp.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <style type="text/css">

        .grid

        {

            margin-top: 50px;

        }

    </style>

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <center>

        <div>

            <table>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Label ID="Label1" runat="server" Text="Select Data with Spatial Types via Entity Framework 5.0"

                            Font-Bold="true" Font-Size="Large" Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button1" runat="server" Text="Select Data" Font-Names="Verdana" Width="213px"

                            BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:GridView ID="GridView1" runat="server" CssClass="grid" BackColor="LightGoldenrodYellow"

                            BorderColor="Tan" BorderWidth="1px" CellPadding="2" ForeColor="Black" GridLines="None">

                            <AlternatingRowStyle BackColor="PaleGoldenrod" />

                            <FooterStyle BackColor="Tan" />

                            <HeaderStyle BackColor="Tan" Font-Bold="True" />

                            <PagerStyle BackColor="PaleGoldenrod" ForeColor="DarkSlateBlue" HorizontalAlign="Center" />

                            <SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite" />

                            <sortedascendingcellstyle backcolor="#FAFAE7" />

                            <sortedascendingheaderstyle backcolor="#DAC09E" />

                            <sorteddescendingcellstyle backcolor="#E1DB9C" />

                            <sorteddescendingheaderstyle backcolor="#C2A47B" />

                        </asp:GridView>

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Label ID="Label3" runat="server" Font-Bold="true" Font-Size="Medium" Font-Names="Verdana"></asp:Label>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>

Step 5: The complete code of WebForm1.aspx.cs looks like this:
 

using System;

using System.Collections.Generic;

using System.Data.Spatial;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace SpatialTypeEFApp

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            var query = (from r in objEntities.tblDepartmentsorderby r.Location.Distance(DbGeography.FromText("POINT(43 19)"))select new

            {

                DeptId = r.DeptId, DepartmentName = r.Name

            }).ToList();GridView1.DataSource = query;GridView1.DataBind();

            Label3.ForeColor = System.Drawing.Color.Green;Label3.Text = "Data Successfully Retrieved";

        }

        #region Instance

        MembersCompanyEntities objEntities = new CompanyEntities();

        #endregion

    }

}

Step 6: The output of the application looks like this:


Spatial-Types-via-EDF-Framework.jpg


Step 7: The selected data output of the application looks like this:


Spatial-Types-Output-via-EDF-Framework.jpg

COMMENT USING

Trending up