The Knowledge Foundation : 025 Web Sevice -Consuming Web Service

Consuming Web Service

Web service is a communication platform between application. Web service hosted by the same application is also can we consume by
the application itself . The most common communication protocol of Web Services SOAP.SOAP stand for simple object access protocol.

SOAP XML based protocol for accessing web service
SOAP communicate over HTTP
SOAP is W3C recommended.

Web service can be consume in two way. One can consumer service by

Creating proxy
Consuming web service programmatically

Creating proxy

Before using web proxy, a proxy must be created. The proxy is registered with the client application , the client application make call to the web service as it is calling local method. When the proxy is called, that the WebService is wrapped with proper method with SOAP protocol, on the Response ,proxy decode the result and return it to the application.

A proxy can be added from

Project >>AddServiceReference>>Address>> Go>>OK.

You will find service reference icon , it is displays on the same solution Explorer. In the below example we are using the WebService of the previous chapter. You will enter first name and last name and your WebService will return the complete name.

1)AddServiceReference

2)Service Reference icon

3) Calling Page HTML

<%@ 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">

</head>

<body>

<table>

<tr>

<td>First Name :

</td>

<td>

<asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

</td>

</tr>

</table>

<div>

</div>

</form>

</body>

</html>

3) Calling Page C# Code

using System;

using System.Collections.Generic;

using System.Linq;

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)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

WebService ab = new WebService();

string fullName=ab.GetFullName(txtFirstName.Text.ToString(), txtLastName.Text.ToString());

Response.Write(fullName);

}

5) Calling Page HTML View

6) Calling Page , After WebService Call ,Display Full Name

Consuming web service programmatically
Another way to consume WebService is programmatically . First you have to create request with WebService URL . After response is created to get response from webservice. SteamReader and Steam is created to read web service response. The web service we are using return JSON format.

1) C# code to consume WebService

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Net;

using System.Text;

using System.IO;

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

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

string WebServiceUrl = "Your Web Service URL";

WebRequest wreq = WebRequest.Create(WebServiceUrl);

HttpWebResponse wres = (HttpWebResponse)wreq.GetResponse();

Stream dtst = wres.GetResponseStream();

StreamReader sr = new StreamReader(dtst);

string responseFromServer = sr.ReadToEnd();

sr.Close();

dtst.Close();

wres.Close();

}

Output
{ "RestResponse" : { "messages" : [ "Country found matching code [PK]." ], "result" : { "name" : "Pakistan", "PK005" : "PK", "PK003" : "PAK" } } }

The Knowledge Foundation

Wednesday, 4 April 2018

025 Web Sevice -Consuming Web Service

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