SOME METHODS IN .NET C#

ASSALAMU ALAYKUM DEAR DEVELOPER!! TODAY WE WILL SEE WITH YOU SOME METHODS IN .NET C#

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PLAN:
1) Trim();
2) IndexOf();
3) Replace();
4) Compare();
5) EndsWith();

1) Trim(); -- METHOD
BRIEF DESCRIPTION:

In the C# programming language, the Trim() method belongs to the string data type and is used to remove whitespace from the beginning and end of a string. This method is especially useful when processing user input or text cleaning.

Trim() principle of operation of the method;
Trim() method is called on the string object and returns a new string. For example:

using System;

class Program
{
    static void Main()
    {
        string text = "   Hello, World!   ";
        string trimmedText = text.Trim();

        Console.WriteLine($"Original: '{text}'");
        Console.WriteLine($"Trimmed: '{trimmedText}'");
    }
}

RESULT:

Original: '   Hello, World!   '
Trimmed: 'Hello, World!'

As you can see, the Trim() method removed the leading and trailing spaces of the string.

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2) IndexOf() -- METHOD
BRIEF DESCRIPTION:

In C# programming language IndexOf() method is used to determine at which index a certain character or word is located in a string. This method returns the zero-based index of the first match found. -1 is returned if the searched value is not found.

Main use:

using System;

class Program
{
    static void Main()
    {
        string text = "Hello, World!";
        int index = text.IndexOf("World");

        Console.WriteLine($"Index of 'World': {index}");
    }
}

Result:

Index of 'World': 7

Since indexing starts from 0, "World" begins at position 7 in the string.

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3) Replace() -- METHOD;

BRIEF DESCRIPTION:

Replace() Method
The Replace() method in C# is used to replace a specified character or substring with another character or substring within a string. It returns a new string with the replacements, but the original string remains unchanged, as strings are immutable in C#.

Basic Usage:

using System;

class Program
{
    static void Main()
    {
        string text = "Hello, world!";
        string newText = text.Replace("world", "C#");

        Console.WriteLine(newText); // Output: "Hello, C#"
    }
}

This code replaces the word "world" with "C#" and the result is "Hello, C#".

Replacing a Single Character:

You can also use Replace() to replace individual characters:

string text = "banana";
string newText = text.Replace('a', 'o'); 

Console.WriteLine(newText); // Output: "bonono";

Here, all 'a' characters are replaced with 'o'.

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4) Compare() -- METHOD;
BRIEF DESCRIPTION:

Compare() Method
The Compare() method in C# is used to compare two strings and determine their relative order. This method returns either 0, a negative value, or a positive value depending on how the strings compare:

0 — The strings are equal.
Negative value — The first string is less than the second string.
Positive value — The first string is greater than the second string.

Basic Usage:

using System;

class Program
{
    static void Main()
    {
        string text1 = "apple";
        string text2 = "banana";

        int result = String.Compare(text1, text2);

        Console.WriteLine(result); // Output: Negative value
    }
}

In this case, the result is a negative value because "apple" is less than "banana".

Equality Check
If the two strings are equal, the Compare() method will return 0:

string text1 = "apple";
string text2 = "apple";

int result = String.Compare(text1, text2);

Console.WriteLine(result); // Output: 0

Here, since both strings are identical, the result is 0.

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5) EndsWith() -- METHOD;
BRIEF DESCRIPTION:
EndsWith() Method
The EndsWith() method in C# is used to check if a string ends with a specified substring or character(s). This method returns a bool value:

true — If the string ends with the specified substring or character(s).
false — If the string does not end with the specified substring or character(s).

Basic Usage:

using System;

class Program
{
    static void Main()
    {
        string fileName = "document.pdf";

        bool result = fileName.EndsWith(".pdf");

        Console.WriteLine(result); // Output: true
    }
}

In this example, it checks if the string "document.pdf" ends with .pdf, and the result is true.

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GENERAL CONCLUSION:

1. Trim(); Trim() – Removes leading and trailing spaces from a string.
2. IndexOf(); IndexOf(value) – Finds the first matching character or word in a string.
3. Replace(); Replace("old", "new") – Replaces the old value with the new value in the string.
4. Compare(); Compare(string, string) – Compares two strings.
5. EndsWith(); EndsWith(string) – Checks if the string ends with the specified substring.