using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.Script.Serialization; // needed for JSON serializers

using System.IO; // needed for Stream and Stream Reader

using System.Net; // needed for the Web Request

namespace WebAPIClient

{

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

{

protected void Page_Load(object sender, EventArgs e)

{

}

// Private helper method used to call the Web API and return the response

private double ExecuteCallToWebAPI(string operation, double value1, double value2)

{

String url = "http://cis-iis2.temple.edu/users/pascucci/CIS3342/CoreWebAPI/api/Calculator/" + operation;

url = url + "/" + value1 + "/" + value2;

// Create an HTTP Web Request and get the HTTP Web Response from the server.

WebRequest request = WebRequest.Create(url);

WebResponse response = request.GetResponse();

// Read the data from the Web Response, which requires working with streams.

Stream theDataStream = response.GetResponseStream();

StreamReader reader = new StreamReader(theDataStream);

String data = reader.ReadToEnd();

reader.Close();

response.Close();

// Deserialize a JSON string into a double.

JavaScriptSerializer js = new JavaScriptSerializer();

double result = js.Deserialize<double>(data);

return result;

}

protected void btnAdd_Click(object sender, EventArgs e)

{

double value1, value2, result;

if (double.TryParse(txtValue1.Text, out value1) &&

double.TryParse(txtValue2.Text, out value2))

{

result = ExecuteCallToWebAPI("Add", value1, value2);

lblDisplay.Text = "The result is " + result;

}

else

{

lblDisplay.Text = "You must enter numerical values for both X and Y!";

}

}

protected void btnSubtract_Click(object sender, EventArgs e)

{

double value1, value2, result;

if (double.TryParse(txtValue1.Text, out value1) &&

double.TryParse(txtValue2.Text, out value2))

{

result = ExecuteCallToWebAPI("Subtract", value1, value2);

lblDisplay.Text = "The result is " + result;

}

else

{

lblDisplay.Text = "You must enter numerical values for both X and Y!";

}

}

protected void btnMultiply_Click(object sender, EventArgs e)

{

double value1, value2, result;

if (double.TryParse(txtValue1.Text, out value1) &&

double.TryParse(txtValue2.Text, out value2))

{

result = ExecuteCallToWebAPI("Multiply", value1, value2);

lblDisplay.Text = "The result is " + result;

}

else

{

lblDisplay.Text = "You must enter numerical values for both X and Y!";

}

}

protected void btnDivide_Click(object sender, EventArgs e)

{

double value1, value2, result;

if (double.TryParse(txtValue1.Text, out value1) &&

double.TryParse(txtValue2.Text, out value2))

{

result = ExecuteCallToWebAPI("Divide", value1, value2);

lblDisplay.Text = "The result is " + result;

}

else

{

lblDisplay.Text = "You must enter numerical values for both X and Y!";

}

}

}

}