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Message Contract in WCF hosted on Web App


Today, in this article let's see the concept of Message Contract in WCF and we will try to implement in this session.

Questions Arises: What is Message Contract?

WCF messages that are used to process from one point to other point which consists of data packet information with header and body. It uses Soap Format processing. It provides customized way to send the information to requested client.

Question Arises: What are MessageHeader and MessageBodyMember ?

  • Message Header: Describes the header of envelop to send message across.
     
  • Message Body Member: Describe the data or body of envelop where all things are integrated into message to send across requested clients.

Question Arises: How Message Contract Differs from Data Contract?

Message Contract is that which describes how the SOAP messages are sent to and from services with header and bodies in the envelop. If you are more prescribed about sending message and where by concentrating on layout then I would suggest you go for message contract. On the other hand, the Data Contracts describes the data structure with supported data types how the client can consume the WCF Service. In other words, It is a standardize relationship between service and client to exchange data.

So, now we all are good to go and implement this concept practically.

The Complete Code of MessageClass.cs looks like this:

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.ServiceModel;

namespace MessageContractWCF
{
    [MessageContract]
    public class MessageClass
    {
        private string _typeofOperation;
        private double _firstNumber;
        private double _secondNumber;
        private double _output;

        public MessageClass()
        {

        }

        public MessageClass(string operation, double firstnum, double secondnum, double outputresult)
        {
            this._typeofOperation = operation;
            this._firstNumber = firstnum;
            this._secondNumber = secondnum;
            this._output = outputresult;

        }

        public MessageClass(MessageClass simple)
        {
            this._typeofOperation = simple._typeofOperation;
            this._firstNumber = simple._firstNumber;
            this._secondNumber = simple._secondNumber;
            this._output = simple._output;

        }

        [MessageHeader]
        public string TypeofOperation
        {
            get { return _typeofOperation; }
            set { _typeofOperation = value; }

        }

        [MessageBodyMember]
        public double FirstNumber
        {
            get { return _firstNumber; }
            set { _firstNumber = value; }
        }

        [MessageBodyMember]
        public double SecondNumber
        {
            get { return _secondNumber; }
            set { _secondNumber = value; }

        }
        [MessageBodyMember]
        public double Output
        {
            get { return _output; }
            set { _output = value; }

        }
    }
}

The Complete Code of IService1.cs looks like this:

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Serialization;
 using System.ServiceModel;
 using System.ServiceModel.Web;
 using System.Text;
 namespace MessageContractWCF
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
    [ServiceContract]
    public interface IService1
    {
        [OperationContract] MessageClass Arthimetic(MessageClass data);
    }
}

The Complete Code of Service1.svc looks like this:

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Serialization;
 using System.ServiceModel;
 using System.ServiceModel.Web;
 using System.Text;
 namespace MessageContractWCF
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
    public class Service1 : IService1
    {
        public MessageClass Arthimetic(MessageClass data)
        {
            var result = new MessageClass(data);
            switch (result.TypeofOperation)
            {
                case "+": result.Output = data.FirstNumber + data.SecondNumber;
                    break; case "-": result.Output = data.FirstNumber - data.SecondNumber;
                        break; case "*": result.Output = data.FirstNumber * data.SecondNumber;
                            break; case "/": result.Output = data.FirstNumber / data.SecondNumber;
                                break; default: result.Output = 0;
                                    break;
            }
            return result;
        }
    }
}

The Complete Code of Web.Config looks like this:

<?xml version="1.0"?>
 <configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
   </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
           <!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
         </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
   </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
   </system.webServer>
</configuration>

The Complete Code of WebForm1.aspx looks like this:

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

<!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 id="Head1" runat="server">
    <title></title>
    <style type="text/css">
        .lbl
        {
            font-family: Cambria;
        }
    </style>
 </head>
<body>
    <form id="form1" runat="server">
    <div>
        <center>
            <table>
                <tr>
                    <td>
                        <asp:Label ID="Label1" runat="server" CssClass="lbl" Text="Please Enter First Number"
                            Font-Bold="true" ForeColor="Brown" Font-Italic="true"></asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:Label ID="Label2" runat="server" CssClass="lbl" Text="Please Enter Second Number"
                            Font-Bold="true" ForeColor="Brown" Font-Italic="true"></asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td>
                        <asp:Button ID="Button1" runat="server" Text="Addition" Width="120px" OnClick="Button1Click"
                            BackColor="HotTrack" />
                    </td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td>
                        <asp:Button ID="Button2" runat="server" Text="Substraction" Width="120px" OnClick="Button2Click"
                            BackColor="HotTrack" />
                    </td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td>
                        <asp:Button ID="Button3" runat="server" Text="Multiplication" Width="120px" OnClick="Button3Click"
                            BackColor="HotTrack" />
                    </td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td>
                        <asp:Button ID="Button4" runat="server" Text="Division" Width="120px" OnClick="Button4Click"
                            BackColor="HotTrack" />
                    </td>
                </tr>
            </table>
            <table>
                <tr>
                    <td>
                        <asp:Label ID="Label3" runat="server" Font-Size="Larger" CssClass="lbl" ForeColor="Brown"
                            Visible="false"></asp:Label>
                    </td>
                </tr>
            </table>
        </center>
    </div>
    </form>
 </body>
</html>

The Complete Code of WebForm1.aspx.cs looks like this:

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using WCFMessage.ServiceReference1;

namespace WCFMessage
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void PageLoad(object sender, EventArgs e)
        {

        }

        protected void Button1Click(object sender, EventArgs e)
        {
            if (TextBox1.Text == "" && TextBox2.Text == "")
            {
                Label3.Text = "<center><b><i>Please Enter Some Values";
                Label3.Visible = true;
            }
            else
            {
                var objClient = new Service1Client();
                var msgClass = new MessageClass();
                msgClass.FirstNumber = Convert.ToDouble(TextBox1.Text);
                msgClass.SecondNumber = Convert.ToDouble(TextBox2.Text);
                msgClass.TypeofOperation = "+";
                var msgres = ((IService1)objClient).Arthimetic(msgClass);
                Label3.Text = ("&nbsp The Addition of: &nbsp" + msgClass.FirstNumber + "&nbsp and &nbsp" + msgClass.SecondNumber + "&nbsp is:<center><b><i> &nbsp" + msgres.Output);
                Label3.Visible = true;
            }
        }

        protected void Button2Click(object sender, EventArgs e)
        {
            if (TextBox1.Text == "" && TextBox2.Text == "")
            {
                Label3.Text = "<center><b><i>Please Enter Some Values";
                Label3.Visible = true;
            }
            else
            {
                var objClient = new Service1Client();
                var msgClass = new MessageClass();
                msgClass.FirstNumber = Convert.ToDouble(TextBox1.Text);
                msgClass.SecondNumber = Convert.ToDouble(TextBox2.Text);
                msgClass.TypeofOperation = "-";
                var msgres = ((IService1)objClient).Arthimetic(msgClass);
                Label3.Text = ("&nbsp The Substraction of: &nbsp" + msgClass.FirstNumber + "&nbsp and &nbsp" + msgClass.SecondNumber + "&nbsp is:<center><b><i> &nbsp" + msgres.Output);
                Label3.Visible = true;
            }
        }

        protected void Button3Click(object sender, EventArgs e)
        {
            if (TextBox1.Text == "" && TextBox2.Text == "")
            {
                Label3.Text = "<center><b><i>Please Enter Some Values";
                Label3.Visible = true;
            }
            else
            {
                var objClient = new Service1Client();
                var msgClass = new MessageClass();
                msgClass.FirstNumber = Convert.ToDouble(TextBox1.Text);
                msgClass.SecondNumber = Convert.ToDouble(TextBox2.Text);
                msgClass.TypeofOperation = "*";
                var msgres = ((IService1)objClient).Arthimetic(msgClass);
                Label3.Text = ("&nbsp The Multiplication of: &nbsp" + msgClass.FirstNumber + "&nbsp and &nbsp" + msgClass.SecondNumber + "&nbsp is:<center><b><i> &nbsp" + msgres.Output);
                Label3.Visible = true;
            }
        }

        protected void Button4Click(object sender, EventArgs e)
        {
            if (TextBox1.Text == "" && TextBox2.Text == "")
            {
                Label3.Text = "<center><b><i>Please Enter Some Values";
                Label3.Visible = true;
            }
            else
            {
                var objClient = new Service1Client();
                var msgClass = new MessageClass();
                msgClass.FirstNumber = Convert.ToDouble(TextBox1.Text);
                msgClass.SecondNumber = Convert.ToDouble(TextBox2.Text);
                msgClass.TypeofOperation = "/";
                var msgres = ((IService1)objClient).Arthimetic(msgClass);
                Label3.Text = ("&nbsp The Division of: &nbsp" + msgClass.FirstNumber + "&nbsp and &nbsp" + msgClass.SecondNumber + "&nbsp is:<center><b><i> &nbsp" + msgres.Output);
                Label3.Visible = true;
            }
        }
    }
}

The Output of the Application looks like this:

MessageContractFirst.png

The Addition Operation Output of the Application looks like this:

MessageContractSecond.png

The Nothing Entered Values output looks like this:

MessageContractThird.png

I hope this article is useful for you.


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