String
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In C#, a string is a sequence of characters, represented by the string keyword. Here are some of the most commonly used methods for working with strings:
- Length: Returns the number of characters in a string.
string str = "Hello, World!";
int len = str.Length; // len = 13
- Substring: Returns a substring from the specified starting position and length.
string str = "Hello, World!";
string substr = str.Substring(7, 5); // substr = "World"
- IndexOf: Returns the index of the first occurrence of a specified character or substring within a string.
string str = "Hello, World!";
int index = str.IndexOf("World"); // index = 7
- Replace: Returns a new string in which all occurrences of a specified character or substring are replaced with another character or substring.
string str = "Hello, World!";
string newStr = str.Replace("World", "Universe"); // newStr = "Hello, Universe!"
- ToLower: Returns a new string in which all characters are converted to lowercase.
string str = "Hello, World!";
string newStr = str.ToLower(); // newStr = "hello, world!"
- ToUpper: Returns a new string in which all characters are converted to uppercase.
string str = "Hello, World!";
string newStr = str.ToUpper(); // newStr = "HELLO, WORLD!"
- Concat: Concatenates two or more strings into a single string.
string str1 = "Hello, ";
string str2 = "World!";
string newStr = String.Concat(str1, str2); // newStr = "Hello, World!"
- Format: Replaces one or more format items in a string with the string representation of a specified object.
string str = "Hello, {0}!";
string name = "John";
string newStr = String.Format(str, name); // newStr = "Hello, John!"
These are just a few of the many methods provided by the String class in C#. The exact method you need will depend on the specific program you’re writing.
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