C#Category

C# programming with CSharp

In the last tutorial, I solve the connection with the firebase database. In this tutorial, I add a new record into the database and I fix the source code to work well with this. See the source code:

C#
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        protected override void OnCreate(Bundle savedInstanceState)
        {
 
            base.OnCreate(savedInstanceState);
            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);
          
            button = FindViewById<Button>(Resource.Id.button1);
            this.FindViewById<Button>(Resource.Id.button1).Click += this.Button_Clicked;
        }
 
        void Button_Clicked(System.Object sender, System.EventArgs e) {
 
            mytextView = FindViewById<TextView>(Resource.Id.textView1);
            this.FindViewById<TextView>(Resource.Id.textView1).Text = "Is set!";
            recordData = FindViewById<EditText>(Resource.Id.editText1);
            string conn = "https://xamarinapp-8cccb-default-rtdb.europe-west1.firebasedatabase.app";
            FirebaseClient firebaseClient = new Firebase.Database.FirebaseClient(conn);
            firebaseClient.Child("Records").PostAsync(new MyDatabaseRecord
            {
                MyProperty = recordData.Text
            });
            recordData.Text = "";
        }

You can see the result of this source code into the… Continue Reading C# – First steps with C# and .NET – part 049.

Today’s tutorial is about C# and the google firebase service. The main goal is to connect a Xamarin Application with an Firebase Database. You need to create a simple database without any records on this. Open your Firebase account and create a database , you will see the URL of… Continue Reading C# – First steps with C# and .NET – part 048.

Extension methods enable you to “add” methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. Extension methods are static methods, but they’re called as if they were instance methods on the extended type. see the official website. Let’s see one simple example:… Continue Reading C# – First steps with C# and .NET – part 047.

The DeepAI API can be used our API to process images and videos to get data about the demographics of people present, faces detected, and nudity detected. You can even flag media that contains nudity so you can remove it … You can test it online with this online tool… Continue Reading C# – First steps with C# and .NET – part 046.

In this tutorial, I will show you how you can multiply two matrices using the C# programming language. The full source code in C# can be found on my account on dotnetfiddle online tool. This is the source code I used:

C#
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using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
Console.WriteLine("Hello World");
 
int i,j,k;
int[,] A = {{1, 2}, {3, 5}, {1,1976}};
int[,] B = {{5, 10, 5}, {100, 1000, 1}};
var ARows = A.GetLength(0);  
var ACols = A.GetLength(1);  
var BRows = B.GetLength(0);  
var BCols = B.GetLength(1);
Console.WriteLine("Numebr of rows in matrix A:  " + ARows + " and number of columns in matrix A: " + ACols);
Console.WriteLine("Numebr of rows in matrix B:  " + BRows + " and number of columns in matrix B: " + BCols);
int[,] C = new int[ARows, BRows];
 
List<int> matrixDimA = new List<int>();
List<int> matrixDimB = new List<int>();
Console.WriteLine("Number of matrix A elements are :" + ARows *ACols);  
//matrixDimA.Reverse();
Console.WriteLine("Elements of matrix A elements are :");  
for (i = 0; i < ARows; i++)
{
Console.Write("[");
for (j = 0; j < ACols; j++)
{
if (j != ACols - 1)
{
Console.Write( A[i, j] + ",");
}
else
{
Console.Write( A[i, j]);
}
}
Console.WriteLine("]");
}
Console.WriteLine("Number of matrix A elements are :" + BRows *BCols);  
Console.WriteLine("Elements of matrix A elements are :");  
for (i = 0; i < BRows; i++)
{
Console.Write("[");
for (j = 0; j < BCols; j++)
{
if (j != BCols - 1)
{
Console.Write( B[i, j] + ",");
}
else
{
Console.Write( B[i, j]);
}
}
Console.WriteLine("]");
}
 
if((ARows == BCols) & (ACols == BRows))
{
Console.WriteLine("Matrix multiplication is possible because: ");
Console.WriteLine("Numebr of rows in matrix A:  " + ARows + " = with number of columns in matrix B: " + BCols);
Console.WriteLine("Numebr of columns in matrix A:  " + ACols + " = with number of rows in matrix B: " + BRows);
for (i = 0; i < ARows; i++)
{
Console.Write("[");
for (j = 0; j < BRows; j++)
{
if (j != ACols - 1)
{
C[i, j] = A[i, j] * B[j, i];
Console.Write( C[i, j] + ",");
}
else
{
C[i, j] = A[i, j] * B[j, i];
Console.Write( C[i, j]);
}
}
Console.WriteLine("]");
}
 
} else {
Console.WriteLine("Matrix multiplication rows is not possible.");
}
var CRows = C.GetLength(0);  
var CCols = C.GetLength(1);
Console.WriteLine("Number of matrix C elements are :" + CRows *CCols);  
Console.WriteLine("Elements of matrix C elements are :");  
 
for (i = 0; i < CRows; i++)
{
Console.Write("[");
for (j = 0; j < CCols; j++)
{
if (j != CCols - 1)
{
Console.Write( C[i, j] + ",");
}
else
{
Console.Write( C[i, j]);
}
}
Console.WriteLine("]");
}
}
}

This is the output:

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Hello World
Numebr of rows in matrix A:  3 and number of columns in matrix A: 2
Numebr of rows in matrix B:  2 and number of columns in matrix B: 3
Number of matrix A elements are :6
Elements of matrix A elements are :
[1,2]
[3,5]
[1,1976]
Number of matrix A elements are :6
Elements of matrix A elements are :
[5,10,5]
[100,1000,1]
Matrix multiplication is possible because:
Numebr of rows in matrix A:  3 = with number of columns in matrix B: 3
Numebr of columns in matrix A:  2 = with number of rows in matrix B: 2
[5,200]
[30,5000]
[5,1976]
Number of matrix C elements are :6
Elements of matrix C elements are :
[5,200]
[30,5000]
[5,1976]

The string interpolation feature is built on top of the composite formatting feature and provides a more readable and convenient syntax to include formatted expression results in a result string. – see documentation webpage. In this tutorial, I will show you how can use this feature. First, let’s see the… Continue Reading C# – First steps with C# and .NET – part 044.

In this tutorial, I will show you a C # source code that he uses FileStream and StreamWriter to write to the file. A Stream for a file, supporting both synchronous and asynchronous read and write operations. A TextWriter is used for writing characters to a stream in a particular… Continue Reading C# – First steps with C# and .NET – part 043.

This online tool can help you to understand how C# source code works with the Just-In-Time compiler(JIT) and the Intermediate Language (IL) code generated by the C# compiler. If you switch to decompile to C# you can see more information about this simple example. This decompiles C#, compiles code, then… Continue Reading C# – First steps with C# and .NET – part 042.

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