Strings and Important String Methods – Learn Automation Devops

Agenda

C-Sharp String

A string variable contains a collection of characters surrounded by double quotes.
In C#, a string is a series of characters that is used to represent text. It can be a character or Alphabets, Numbers, Special characters, word or a long passage surrounded with the double quotes “ “
An array of characters works same as C# string.
There two ways to declare a string variable in C#. Using System.String class and using string keyword. Both are the same and make no difference.

String Example:

string s1 = “Welcome to C#”;

char[] ch={‘c’,’h',’a',’r’,’p'};>/code>

String s2=new String(ch);

String s3= “C# String";

string s3 = new string('B', 5); // Output BBBBB

String class function

User can merge/combine two or more C# String fields using the + operator and concatenate using Concat() method. string str1 = “Selenium “; string str2 =”Training ”; Console.WriteLine(str1 + str2 +500); //Selenium Training 500 Console.WriteLine(String.Concat(str1, str2)); //Selenium Training
IndexOf(): Returns the index of the first occurrence of the specified character/substring within the string. -1 if the specified character/string is not found. string str2 = "studyhard"; Console.WriteLine(str2.IndexOf(‘t’)); //Output: 1 Console.WriteLine(str2.IndexOf(‘0’)); //Output: -1 Console.WriteLine(str2[1]); // Outputs “t“ using string index
CompareTo(): It compares two strings in the alphabetical order. Result is 0 when the strings are equal; Positive integer in case the first string comes after the second string in the alphabetical order; Negative integer when the first string comes before the second string in the alphabetical order. string s1 = "Amit"; string s2 = “Pradip"; Console.WriteLine(s1.CompareTo(s2));
Length: Returns the number of characters in a String. string str4=“CSharp"; Console.WriteLine("string length is: "+ str4.length());
Replace(): Returns a string replacing all the old char or CharSequence to new char or CharSequence. string str5=“Tutorialspoint is a very good website"; Console.WriteLine(str5.Replace(“is", “was")); //Replace phrase Console.WriteLine(str5.Replace('o', 'e')); //Replace char word

String class function - Contd

ToLower(): Returns string with all uppercase characters changed to lowercase string str4 = "ABCDEFGHIJ"; Console.WriteLine(str4.ToLower()); //Output: abcdefghij
ToUpper(): Returns string with all lowercase character changed to uppercase string str5 = “selenium"; Console.WriteLine(str5.ToLower()); //Output: SELENIUM
Trim(): Returns a string from which any leading and trailing whitespaces are being removed string str6 = " helloCSharp "; Console.WriteLine(str6.Trim()); //Output: helloCSharp
Contains(): Searches the sequence of characters in this string. It returns True if sequence of char values are found in this string or else returns False. string name="do you know about selenium webdriver?"; Console.WriteLine(name.Contains("you know")); //Output: True Console.WriteLine(name.Contains("hello")); //Output: False Console.WriteLine(name.Contains("you")); //Output: True

String class function - Contd

Empty: Create a String without anything or zero length. string emptyStr = String.Empty; string emptyStr1 = null; Console.WriteLine(emptyStr); Console.WriteLine(emptyStr1);
StartsWith(): Checks if this string starts with given prefix. It returns true if this string starts with given prefix or else returns false. string s3=“welcome to CSharp and selenium training session"; Console.WriteLine(s3.StartsWith(“we")); // Output: True
EndsWith(): Checks if this string ends with given prefix. It returns true if this string ends with given prefix else returns false. string s4=“welcome to CSharp and selenium training session"; Console.WriteLine(s4.EndsWith(“session")); // Output: True Console.WriteLine(s4.EndsWith(“CSharp")); // Output: False
Substring(): Returns a part of the string. User pass begin index and length in the CSharp substring method where start index is inclusive and length is exclusive. string s5="CSharptraining"; Console.WriteLine(s5.Substring(3)); // Output: arptraining Console.WriteLine(s5.Substring(3, 6)); // Output: arptra

string s1 = "CSharptraining"; Console.WriteLine(s1[1]); // Outputs "H" String s4 = " welcome to C# "; string s5 = "zelcome to C#"; Console.WriteLine(s1); Console.WriteLine(s4); Console.WriteLine(String.Concat(s1, s4));

char[] ch ={'c','c','h','a','r','p'}; String s2=new String(ch); Console.WriteLine(s2);

Console.WriteLine(s5.CompareTo(s1));

string s3 = new string('B', 5);

string emptyStr = String.Empty; string emptyStr1 = null; String str2 = "studyhard"; Console.WriteLine(str2.IndexOf('t')); //Output: 1 Console.WriteLine(str2.IndexOf('0')); //Output: -1

Console.WriteLine(s3); Console.WriteLine(emptyStr); Console.WriteLine(emptyStr1); Console.WriteLine(s4);
String str3 ="welcome to CSharp and selenium training session";
Console.WriteLine(str3.StartsWith("we")); // Output: True Console.WriteLine(str3.EndsWith("we")); // Output: False Console.WriteLine(str3.EndsWith("session")); // Output: True

Console.WriteLine(s4.Trim()); Console.WriteLine(s3.Length); Console.WriteLine(s1.ToLower()); Console.WriteLine(s1.ToUpper()); Console.WriteLine(s1+100+s2+s3); Console.WriteLine(string.Concat(s1,s2,s3));
Console.WriteLine(s1[2]); // l Console.WriteLine(s1.IndexOf("o")); // 3 Console.WriteLine(s1.Substring(3)); Console.WriteLine(s1.Substring(3, 6)); //starting from 3 index and then total 6 char Console.WriteLine(s1.Replace("to", "too")); //Replace pharase Console.WriteLine(s1.Replace('o', 'e')); //Replace char word

string name = "do you know about selenium webdriver?"; Console.WriteLine(name.Contains("you know")); //Output: True Console.WriteLine(name.Contains("hello")); //Output: False Console.WriteLine(name.Contains("you")); //Output: True