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Welcome to another tutorial from verycsharpedge!
I this tutorial we will learn about the different stuff
you could do with C# strings.
We will look into the following methods/properties:
·
Contains()
·
EndsWith()
·
Equals()
·
IndexOf()
·
Insert()
·
Length
·
PadLeft()
·
PadRight()
·
Remove()
·
Replace()
·
Split()
·
StartsWith()
·
Substring()
·
ToLower()
·
ToUpper()
·
Trim()
·
TrimEnd()
·
TrimStart()
OK, Let’s Begin!
1.
Create a new console project.
2.
Add this line of code inside of main.
string myString = "Hello
world!";
Console.WriteLine("myString
= Hello world!");
Console.ReadLine();
This line of code creates a variable ‘myString’ with data
type of string. Next it outputs to
console showing what variable where going to work in the next steps.
Console.Readline() allows us to see the output before exiting the program.
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3.
Before the line Console.Readline() add this
code.
Console.WriteLine("-
Using the Contains() method -");
if (myString.Contains("Hello"))
Console.WriteLine("Your string does contain Hello");
Console.WriteLine();
Focus on the [if] statement. This line shows us how to us
the Contains() method. The method returns true if the variable has the
parameters passed which is ‘Hello’ otherwise it returns false.
4.
Before the line Console.Readline() add this
code.
Console.WriteLine("-
Using the EndsWith() method -");
if (myString.EndsWith("world!"))
Console.WriteLine("Your string does end with 'world!'");
Console.WriteLine();
This section of code shows the method EndsWith() which is
like Contains() but only checks at the end of the string.
5.
Before the line Console.Readline() add this
code.
Console.WriteLine("-
Using the Equals() method -");
if (myString.Equals("Hello
world!"))
Console.WriteLine("Yes it's equal to 'Hello world!'");
Console.WriteLine();
This section of code show the method Equals which
compares the passed string parameter to the string variable. It returns true if
it matches otherwise it returns false.
6.
Before the line Console.Readline() add this code.
Console.WriteLine("-
Using the IndexOf() method -");
Console.WriteLine("The
index of 'w' is " + myString.IndexOf('w'));
Console.WriteLine();
The IndexOf() method returns the position of the
parameter being passed. The index starts with zero.
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7.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using Insert() method -");
Console.WriteLine(myString.Insert(0, "Another "));
Console.WriteLine();
The Insert() method inserts a string on the desired
index.
8.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using Length property -");
Console.WriteLine("The
length of 'Hello world!' is " + myString.Length);
Console.WriteLine();
The Length property returns the number of characters in a
string.
9.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using PadLeft() method -");
Console.WriteLine(myString.PadLeft(20));
Console.WriteLine();
This section of code shows PadLeft() method in action. It
adds spaces to the left of the string. It also has the option to specify the
character to use for pad.
10.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using PadRight() method -");
Console.WriteLine(myString.PadRight(20,'#'));
Console.WriteLine();
This section of code show PadRight() which is the
opposite of PadLeft(). You can also specify a padding character as a second
parameter.
11.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using Remove() method -");
Console.WriteLine("Remove
all the character starting at index 6");
Console.WriteLine(myString.Remove(6));
Console.WriteLine();
The Remove() method removes a certain sequence of
characters specified on the passed parameter as the starting index. It also has
the option to remove a specific number of characters as a second parameter.
12.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using Replace() method -");
Console.WriteLine("Replace
the word 'world' in the string 'Hello world!' with 'Mars'");
Console.WriteLine(myString.Replace("world", "Mars"));
Console.WriteLine();
This section shows the use of the Replace() method. This
method replaces the string specified in the first parameter with the string
specified in the second parameter.
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13.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using Split property -");
string[] words = myString.Split('
');
foreach (string word in words)
{
Console.WriteLine(word);
}
Console.WriteLine();
The method Split() turn the string into an array of
strings that are separated by a specified character which is a space in this
example.
14.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using StartsWith() method -");
Console.WriteLine("'Hello
world!' starts with 'Hello' is " + myString.StartsWith("Hello"));
Console.WriteLine();
The method StartsWith() checks if the string begins with
the string that is passed as the first parameter. It returns true if it matches
and returns false if not.
15.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using Substring() method -");
Console.WriteLine(myString.Substring(0, 5));
Console.WriteLine();
The Substring() method extracts a sequence of characters that
starts from the specified index(first parameter) together with the number of
characters(second parameter) and returns a string. There is also an option to
pass just the starting index which extracts characters up until the end of the
string.
16.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using ToLower() method -");
Console.WriteLine(myString.ToLower());
Console.WriteLine();
This sections shows ToLower() method which returns a
string turned into lowercase letters.
17.
Before the line Console.Readline() add this
code.
Console.WriteLine(" - Using
ToUpper method -");
Console.WriteLine(myString.ToUpper());
Console.WriteLine();
This sections shows ToUpper() method which returns a
string turned into uppercase letters.
18.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using Trim() method -");
myString = " Hello world! ";
Console.WriteLine(myString.Trim());
Console.WriteLine();
The Trim() method removes trailing and leading spaces of
the string.
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19.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using TrimEnd() method -");
Console.WriteLine(myString.TrimEnd());
Console.WriteLine();
The TrimEnd() method removes trailing spaces from the string.
20.
Before the line Console.Readline() add this
code.
Console.WriteLine(" -
Using TrimStart() method -");
Console.WriteLine(myString.TrimStart());
Console.WriteLine();
The TrimStart() method removes leading spaces from the
string.
21.
After all the code run the application by
pressing F5. Your output should look similar to the following image.
Hope you enjoyed our long tutorial.
Be happy and keep coding!
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