C# – A simple interface with 3 classes in C#

Posted on February 26, 2015 by

In the current article, I will show how to resolve with VBA an entry exam for programming in HackBulgaria. The problems could be resolved in any language and I will use VBA for this last task. The program is actually the development of a cipher, thus it takes string as input and codes it as per the cipher. This is how the task looks like:

Make an interface, called MyLogger with only 1 method – log(level, message)

The two arguments should be:

level – an integer, from 1 to 3.
1 means that you are logging with INFO level.
2 means that you are logging with WARNING level.
3 means that you are logging with PLSCHECKFFS level.
message is a string, that you are logging.

Make 3 different classes, that implement the interface MyLogger:

`ConsoleLogger`

The ConsoleLogger should log the messages directly to the console.

`FileLogger`

The FileLogger should log the messages to a given file.

`HTTPLogger`

The HTTPLogger shoud log the messages via a POST request to a given HTTP url.

What I did?

Something like this:

3 Classes, 1 interface with the method log, and one method called GenerateString in the class ConsoleLogger. Probably its place was not there, but it worked. Anyway, here comes the code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Net;
using System.Collections.Specialized;
using System.Web;
using System.Diagnostics;

class SimpleLogger
{
    public static void Main()
    {
        var log1 = new ConsoleLogger();
        var log2 = new FileLogger();
        var log3 = new HTTPLogger();

        log1.log(1, "Hello World");
        log1.log(2, "Hello World");
        log1.log(3, "Hello Beautiful World");


        log2.log(2, "Hello FileLogger");

        log3.log(3, "Hello HTTP Logger");
    }
}

interface IMyLogger
{
    void log(int iLevel, string sMessage);
}

public class ConsoleLogger : IMyLogger
{
    public void log(int iLevel, string sMessage)
    {
        Console.WriteLine(GenerateString(iLevel, sMessage));
    }

    public string GenerateString(int ilevel, string sMessage)
    {
        string sTime = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssK");
        string sColumns = "::";
        string sLevel = "";

        switch (ilevel)
        {
            case 1:
                sLevel = "INFO";
                break;

            case 2:
                sLevel = "WARNING";
                break;

            case 3:
                sLevel = "PLSCHECKFFS";
                break;

            default:
                break;
        }
        return sLevel + sColumns + sTime + sColumns + sMessage;
    }
}

class FileLogger : IMyLogger
{
    public void log(int iLevel, string sMessage)
    {
        ConsoleLogger Text = new ConsoleLogger();
        string sMessageInside = Text.GenerateString(iLevel, sMessage);
        File.WriteAllText(@"GivenFile.txt", sMessageInside);
    }
}

class HTTPLogger : IMyLogger
{
    public void log(int iLevel, string sMessage)
    {
        ConsoleLogger Text2 = new ConsoleLogger();
        string postData = Text2.GenerateString(iLevel, sMessage);

        //Taken from:
        //http://stackoverflow.com/questions/1502500/how-to-use-webrequest-to-post-data-and-get-response-from-a-webpage 

        // Create a request using a URL that can receive a post. 
        WebRequest request = WebRequest.Create("https://www.vitoshacademy.com");
        // Set the Method property of the request to POST.
        request.Method = "POST";
        // Create POST data and convert it to a byte array.
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);
        // Set the ContentType property of the WebRequest.
        request.ContentType = "application/x-www-form-urlencoded";
        // Set the ContentLength property of the WebRequest.
        request.ContentLength = byteArray.Length;
        // Get the request stream.
        Stream dataStream = request.GetRequestStream();
        // Write the data to the request stream.
        dataStream.Write(byteArray, 0, byteArray.Length);
        // Close the Stream object.
        dataStream.Close();
        // Get the response.
        WebResponse response = request.GetResponse();
        // Display the status.
        Console.WriteLine(((HttpWebResponse)response).StatusDescription);
        // Get the stream containing content returned by the server.
        dataStream = response.GetResponseStream();
        // Open the stream using a StreamReader for easy access.
        StreamReader reader = new StreamReader(dataStream);
        // Read the content.
        string responseFromServer = reader.ReadToEnd();
        // Display the content.
        Console.WriteLine(responseFromServer);
        // Clean up the streams.
        reader.Close();
        dataStream.Close();
        response.Close();
    }
}

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

using System.Net;

using System.Collections.Specialized;

using System.Web;

using System.Diagnostics;

class SimpleLogger

{

public static void Main()

{

var log1 = new ConsoleLogger();

var log2 = new FileLogger();

var log3 = new HTTPLogger();

log1.log(1, "Hello World");

log1.log(2, "Hello World");

log1.log(3, "Hello Beautiful World");

log2.log(2, "Hello FileLogger");

log3.log(3, "Hello HTTP Logger");

}

interface IMyLogger

{

void log(int iLevel, string sMessage);

}

public class ConsoleLogger : IMyLogger

{

public void log(int iLevel, string sMessage)

{

Console.WriteLine(GenerateString(iLevel, sMessage));

}

public string GenerateString(int ilevel, string sMessage)

{

string sTime = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssK");

string sColumns = "::";

string sLevel = "";

switch (ilevel)

{

case 1:

sLevel = "INFO";

break;

case 2:

sLevel = "WARNING";

break;

case 3:

sLevel = "PLSCHECKFFS";

break;

default:

break;

}

return sLevel + sColumns + sTime + sColumns + sMessage;

}

class FileLogger : IMyLogger

{

public void log(int iLevel, string sMessage)

{

ConsoleLogger Text = new ConsoleLogger();

string sMessageInside = Text.GenerateString(iLevel, sMessage);

File.WriteAllText(@"GivenFile.txt", sMessageInside);

}

class HTTPLogger : IMyLogger

{

public void log(int iLevel, string sMessage)

{

ConsoleLogger Text2 = new ConsoleLogger();

string postData = Text2.GenerateString(iLevel, sMessage);

//Taken from:

//http://stackoverflow.com/questions/1502500/how-to-use-webrequest-to-post-data-and-get-response-from-a-webpage

// Create a request using a URL that can receive a post.

WebRequest request = WebRequest.Create("https://www.vitoshacademy.com");

// Set the Method property of the request to POST.

request.Method = "POST";

// Create POST data and convert it to a byte array.

byte[] byteArray = Encoding.UTF8.GetBytes(postData);

// Set the ContentType property of the WebRequest.

request.ContentType = "application/x-www-form-urlencoded";

// Set the ContentLength property of the WebRequest.

request.ContentLength = byteArray.Length;

// Get the request stream.

Stream dataStream = request.GetRequestStream();

// Write the data to the request stream.

dataStream.Write(byteArray, 0, byteArray.Length);

// Close the Stream object.

dataStream.Close();

// Get the response.

WebResponse response = request.GetResponse();

// Display the status.

Console.WriteLine(((HttpWebResponse)response).StatusDescription);

// Get the stream containing content returned by the server.

dataStream = response.GetResponseStream();

// Open the stream using a StreamReader for easy access.

StreamReader reader = new StreamReader(dataStream);

// Read the content.

string responseFromServer = reader.ReadToEnd();

// Display the content.

Console.WriteLine(responseFromServer);

// Clean up the streams.

reader.Close();

dataStream.Close();

response.Close();

}

Enjoy it! 🙂

Tagged with: C#, C# interface, C# OOP, simple interface with classes

C# – A simple interface with 3 classes in C#

ConsoleLogger

FileLogger

HTTPLogger

What I did?

Related posts:

`ConsoleLogger`

`FileLogger`

`HTTPLogger`