C#
Calculate Loan Installment
1. calculateLoanInstallment.cs
These four packages are required to be used.
Step 1. Create class file to store content of the web response.
2. calculateLoanInstallment.aspx.cs
These 13 packages are required to be used.
Code in Common
(1). Check if user id and password is inside session. When the user id and password is inside user session, it will automatically populate into the user id and pin textbox, so that the user need not manually type his user id and password repeatedly.
Step 2. Store details entered by the user. If user id, password, and OTP exist in session, user need not enter again (refer to common stuff).
Step 3. Create URL which will be post to the server. User inputs need to be stored in the class created, and serialize into JSON format. In this function, only header is needed.
Step 4. Post to the server, and store response. URL is sent using web request function, and a response will be send back from the server. The response need to be deserialized into the ‘calculateLoanInstallment’ class.
Step 5. Obtain error code. If error code is ‘010000’ which means invocation successful, populate attributes of the ‘calculateLoanInstallment’ class into the label. If error code is '010041', it means OTP has expired, and we will use the newOTP() function to prompt the user for the OTP again. Else, we will display the ErrorText and ErrorDetails.
The newOTP() function can be referred to under Common Stuff Section
Overview of LoanInstallment.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace Demo
{
public class CalculateLoanInstallment
{
public cal_Content Content { get; set; }
}
public class cal_Content
{
public cal_ServiceResponse ServiceResponse { get; set; }
}
public class cal_ServiceResponse
{
public InstallmentResponse InstallmentResponse { get; set; }
public PurpleServiceRespHeader ServiceRespHeader { get; set; }
}
public class PurpleServiceRespHeader
{
public FluffyServiceRespHeader ServiceRespHeader { get; set; }
}
public class FluffyServiceRespHeader
{
public object ErrorDetails { get; set; }
public string ErrorText { get; set; }
public string GlobalErrorID { get; set; }
}
public class InstallmentResponse
{
public string Interest { get; set; }
public string InterestRate { get; set; }
public string MaturityDate { get; set; }
public string MonthlyInstallment { get; set; }
}
}
Overview of calculateLoanInstallment.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DotNetOpenAuth.OAuth2;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Collections.Specialized;
using System.Configuration;
using System.Net;
using System.IO;
using System.Windows.Forms;
using System.Data;
namespace Demo
{
public partial class calculateLoanInstallment : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Session["userid"] != null)
{
txtUserID.Text = (string)Session["userid"];
txtPassword.Text = (string)Session["pin"];
}
}
protected void btnSend_Click(object sender, EventArgs e)
{
try
{
// take user inputs
string userID = txtUserID.Text;
Session["userid"] = userID;
string pin = txtPassword.Text;
Session["pin"] = pin;
string otp;
if (Session["otp"] == null)
{
otp = "";
}
else
{
otp = Session["otp"].ToString();
}
string productID = txtProductID.Text;
string principle = txtPrinciple.Text;
string numOfMonths = txtNumOfMonths.Text;
// build header
var header = new HeaderJson();
header.userID = userID;
header.PIN = pin;
header.serviceName = "calculateLoanInstallment";
header.OTP = otp;
var headerJson = new HeaderJsonObject();
headerJson.Header = header;
string strHeader = JsonConvert.SerializeObject(headerJson);
// build content
var content = new ContentJson();
content.ProductID = productID;
content.Principle = principle;
content.NumberOfMonths = numOfMonths;
var contentJson = new ContentJsonObject();
contentJson.Content = content;
string strContent = JsonConvert.SerializeObject(contentJson);
string url = "http://tbankonline.com/SMUtBank_API/Gateway?Header=" + strHeader + "&Content=" + strContent;
// get web response
var webRequest = (HttpWebRequest)WebRequest.Create(url);
webRequest.ContentType = "application/json";
webRequest.Method = "POST";
var result = "";
var httpResponse = (HttpWebResponse)webRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
result = streamReader.ReadToEnd();
}
// parse result into class
CalculateLoanInstallment c = new CalculateLoanInstallment();
c = JsonConvert.DeserializeObject<CalculateLoanInstallment>(result);
string errorID = c.Content.ServiceResponse.ServiceRespHeader.ServiceRespHeader.GlobalErrorID?.ToString() ?? " ";
if (errorID == "010000")
{
string interest = "$" + c.Content.ServiceResponse.InstallmentResponse.Interest.ToString();
txtInterest.Text = interest;
txtMaturityDate.Text = c.Content.ServiceResponse.InstallmentResponse.MaturityDate.ToString();
double rate = Convert.ToDouble(c.Content.ServiceResponse.InstallmentResponse.InterestRate);
rate = rate * 100;
string interestRate = Convert.ToString(rate) + "%";
txtInterestRate.Text = interestRate;
string mInstallment = "$" + c.Content.ServiceResponse.InstallmentResponse.MonthlyInstallment.ToString();
txtMonthlyInstallment.Text = mInstallment;
}
else if (errorID == "010041")
{
otp = utilities.newOTP();
Session["otp"] = otp;
}
else
{
lblTest.Text = c.Content.ServiceResponse.ServiceRespHeader.ServiceRespHeader.ErrorText.ToString();
string errorMessage = c.Content.ServiceResponse.ServiceRespHeader.ServiceRespHeader.ErrorDetails.ToString();
MessageBox.Show(errorMessage);
}
}
catch(Exception ex)
{
lblExceptionMsg.Text = ex.ToString();
}
}
}
}
Created with the Personal Edition of HelpNDoc: Create iPhone web-based documentation