C# String

Explore string methods: create, search and change strings with built-in code.

String. In the forest depths, you see a reflecting pool. Upon the pool, a message suddenly appears. This is a string written upon the water's surface.

String methods. Usually strings do not appear in reflecting pools. But we can manipulate any C# string with methods. New strings are returned.Compare CompareOrdinal CompareTo Concat Contains Copy CopyTo EndsWith Empty Equals Format GetEnumerator GetHashCode IndexOf IndexOfAny Insert Intern IsInterned IsNormalized IsNullOrEmpty IsNullOrWhiteSpace Join LastIndexOf LastIndexOfAny Length Normalize PadLeft PadRight Remove Replace Split StartsWith Substring ToCharArray ToLower ToLowerInvariant ToString ToUpper ToUpperInvariant Trim TrimEnd TrimStart

String interpolation. A string can be created with interpolated values in it. This is similar to string.Format but the syntax is different. We precede the string literal with a "$" sign.String Interpolation

Constructor. Strings are often reused, and passed around within a program. Methods like Replace() create new strings. But we can also create new ones with a constructor.String Constructor

Literals. These specify string data. We use quotes around literal data (characters). Literals are embedded in the program executable.Literal

Comparisons. Are two strings equal? In a Dictionary, we can use a StringComparer to change how keys are compared. We can ignore case.StringComparison, StringComparer

Char. A string contains data made up of individual characters. We deal with these chars in looping constructs. Accessing chars is a fast way to test strings.Char Char: Literal char.IsDigit char.IsLower char.ToLower

TextInfo. This type provides some helpful methods. We can convert a string To Title Case with ToTitleCase. No custom methods are needed.TextInfo TextInfo: ToTitleCase

Whitespace. Strings often contain newline or whitespace. We often need to check for these values. We use methods like IsNullOrWhitespace.NewLine Line Count Whitespace

Empty. An empty string has zero characters. Meanwhile a null string is no string at all. It is a reference that points to no memory location.Empty String Null Strings

Parse, TryParse. When we see a string like "1230" we usually want its numeric form. We use TryParse for this. Here we transform strings into other types. Many routines are built-in.int.Parse

Conversions. We can convert a list into a string. And we can convert a string into a byte array. These are some of the most common conversions.Convert: List, String Convert: String, Byte Array Convert: String, Int

Custom methods. Many string algorithms are composed from the built-in methods. With Substring calls we can Truncate strings. With ToCharArray we can change characters.Custom: IsUpper, IsLower Custom: Reverse String Custom: Right Custom: Sort String Lengths Custom: ToCharArray, Edit Chars Custom: Truncate Custom: Uppercase First Letters

Custom methods, chars. Here are some custom char-based string algorithms. We test individual chars in strings. We use arrays to look up char values.Custom: ASCII Table Custom: Char Lookup Table Custom: Char Test Custom: Combine Chars Custom: Count Characters Custom: Count Letter Frequencies Custom: Duplicate Characters Custom: Get Char at Index Custom: Remove Chars

Explanations. I explain concepts of strings. How do we append strings when there is no append method? We also learn to increment strings.String Append String Increment String Property

StringBuilder. This is not a string, but it is used to build up or change strings. For appending strings in a loop, we likely want to use StringBuilder.StringBuilder

StringBuilder, methods. Here are some methods that the StringBuilder class provides. Some optimizations based on StringBuilder are shown.StringBuilder: Append, AppendLine StringBuilder: AppendFormat StringBuilder: Capacity StringBuilder: Clear StringBuilder: ToString

Optimization. In typical usage strings are fast. But they are sometimes used in an inefficient way. Often reducing string allocations is helpful.Optimization

A review. A string is immutable. It can be used in many methods, and none of them have to worry about data changes. It never becomes invalid. This reduces copies.

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C# String

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