C# Strings
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This document discusses C# .NET strings and various methods that can be used on string variables including trim, contains, replace, and substring. Trim removes unwanted characters from the start and end of a string. Contains checks if a substring is within a string. Replace replaces occurrences of one substring with another. Substring extracts a portion of a string starting from a specified index for a given length.
C# Strings
- 1. Chapter 9C# .NET strings
- 2. What will we be learning?string variable and its methodstrimcontainremove and replacesubstring
- 3. string variable and its methodsstring stringVar = "Dear Mr Tan, how are you?";string anotherStringVar;anotherStringVar = stringVar.IntelliSense- shows you a list of Methods and Properties that are available for the variable
- 4. Full list of methods and properties >Mouse Over
- 5. Part 1 variable and methodsNew solution and project: SpfChapter9_stringsSave all and rename the project to "Part 1 variable and methods"Add a button and a textbox
- 6. Add codes into button click method:
- 8. Length property of string variableThis property return the number of characters in a stringIt also counts the blank spacesEg: stringVar.Length;Note that you don't need any round brackets, because it's a property not a method
- 9. trim methodTo trim unwanted characters from the string – used often to trim blank spaces at the start and the endTrim(): both at the start and the end
- 10. TrimEnd(): at the end
- 11. TrimStart(): at the startContinue from previous projectAdd another button and textboxAdd codes into the button click method
- 12. 3 blank spaces at the start and the end
- 14. Continue …
- 15. Trim()TrimEnd()
- 16. null => blank spaceTrim() same as Trim(null)TrimStart() same as TrimStart(null)TrimEnd() same as TrimEnd(null)
- 19. Trim more than one characters
- 21. Contains method
- 24. Replace methodSpell checker:Replace "mistak" with "mistake"Replace "teh" with "the"::
- 25. Continue
- 26. Add codes into button click method:
- 28. Substring methodintstartIndex => starting position to extract the substring(start from 0)int length => length of the substring
- 29. ContinueAdd a button and textbox
- 30. Add codes for button click method:
- 32. Summarystring variable and its methodstrimcontainremove and replacesubstring