System Namespace

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Represents an immutable string of characters.

String Class Members

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Constructors Visibility Constructor Parameters public String ( Char value ) public String ( Char value , Int32 startIndex , Int32 length ) public String ( SByte value ) public String ( SByte value , Int32 startIndex , Int32 length ) public String ( SByte value , Int32 startIndex , Int32 length , Encoding enc ) public String ( Char value , Int32 startIndex , Int32 length ) public String ( Char value ) public String ( Char c , Int32 count )   Fields Visibility Name Type public static Empty String   Properties Visibility Name Value Type Accessibility public Chars ( Int32 index ) Char [ Get ] public Length Int32 [ Get ]   Methods Visibility Name Parameters Return Type public Clone ( ) Object public static Compare ( String strA , Int32 indexA , String strB , Int32 indexB , Int32 length , Boolean ignoreCase ) Int32 public static Compare ( String strA , Int32 indexA , String strB , Int32 indexB , Int32 length ) Int32 public static Compare ( String strA , Int32 indexA , String strB , Int32 indexB , Int32 length , StringComparison comparisonType ) Int32 public static Compare ( String strA , Int32 indexA , String strB , Int32 indexB , Int32 length , Boolean ignoreCase , CultureInfo culture ) Int32 public static Compare ( String strA , String strB , Boolean ignoreCase ) Int32 public static Compare ( String strA , String strB ) Int32 public static Compare ( String strA , String strB , Boolean ignoreCase , CultureInfo culture ) Int32 public static Compare ( String strA , String strB , StringComparison comparisonType ) Int32 public static CompareOrdinal ( String strA , Int32 indexA , String strB , Int32 indexB , Int32 length ) Int32 public static CompareOrdinal ( String strA , String strB ) Int32 public CompareTo ( Object value ) Int32 public CompareTo ( String strB ) Int32 public static Concat ( String str0 , String str1 , String str2 ) String public static Concat ( Object arg0 , Object arg1 , Object arg2 ) String public static Concat ( String str0 , String str1 ) String public static Concat ( Object args ) String public static Concat ( String str0 , String str1 , String str2 , String str3 ) String public static Concat ( Object arg0 , Object arg1 ) String public static Concat ( Object arg0 , Object arg1 , Object arg2 , Object arg3 ) String public static Concat ( Object arg0 ) String public static Concat ( String values ) String public Contains ( String value ) Boolean public static Copy ( String str ) String public CopyTo ( Int32 sourceIndex , Char destination , Int32 destinationIndex , Int32 count ) Void public EndsWith ( String value , Boolean ignoreCase , CultureInfo culture ) Boolean public EndsWith ( String value ) Boolean public EndsWith ( String value , StringComparison comparisonType ) Boolean public Equals ( String value , StringComparison comparisonType ) Boolean public static Equals ( String a , String b ) Boolean public static Equals ( String a , String b , StringComparison comparisonType ) Boolean public Equals ( Object obj ) Boolean public Equals ( String value ) Boolean public static Format ( String format , Object arg0 , Object arg1 , Object arg2 ) String public static Format ( String format , Object arg0 ) String public static Format ( String format , Object arg0 , Object arg1 ) String public static Format ( IFormatProvider provider , String format , Object args ) String public static Format ( String format , Object args ) String public GetEnumerator ( ) CharEnumerator public GetHashCode ( ) Int32 public GetTypeCode ( ) TypeCode public IndexOf ( String value , Int32 startIndex ) Int32 public IndexOf ( String value ) Int32 public IndexOf ( String value , StringComparison comparisonType ) Int32 public IndexOf ( String value , Int32 startIndex , Int32 count ) Int32 public IndexOf ( String value , Int32 startIndex , StringComparison comparisonType ) Int32 public IndexOf ( String value , Int32 startIndex , Int32 count , StringComparison comparisonType ) Int32 public IndexOf ( Char value ) Int32 public IndexOf ( Char value , Int32 startIndex , Int32 count ) Int32 public IndexOf ( Char value , Int32 startIndex ) Int32 public IndexOfAny ( Char anyOf , Int32 startIndex ) Int32 public IndexOfAny ( Char anyOf , Int32 startIndex , Int32 count ) Int32 public IndexOfAny ( Char anyOf ) Int32 public Insert ( Int32 startIndex , String value ) String public static Intern ( String str ) String public static IsInterned ( String str ) String public IsNormalized ( ) Boolean public IsNormalized ( NormalizationForm normalizationForm ) Boolean public static IsNullOrEmpty ( String value ) Boolean public static Join ( String separator , String value ) String public static Join ( String separator , String value , Int32 startIndex , Int32 count ) String public LastIndexOf ( String value , Int32 startIndex , Int32 count ) Int32 public LastIndexOf ( String value , Int32 startIndex ) Int32 public LastIndexOf ( String value , StringComparison comparisonType ) Int32 public LastIndexOf ( String value , Int32 startIndex , Int32 count , StringComparison comparisonType ) Int32 public LastIndexOf ( String value , Int32 startIndex , StringComparison comparisonType ) Int32 public LastIndexOf ( Char value , Int32 startIndex ) Int32 public LastIndexOf ( Char value ) Int32 public LastIndexOf ( Char value , Int32 startIndex , Int32 count ) Int32 public LastIndexOf ( String value ) Int32 public LastIndexOfAny ( Char anyOf , Int32 startIndex , Int32 count ) Int32 public LastIndexOfAny ( Char anyOf ) Int32 public LastIndexOfAny ( Char anyOf , Int32 startIndex ) Int32 public Normalize ( NormalizationForm normalizationForm ) String public Normalize ( ) String public PadLeft ( Int32 totalWidth ) String public PadLeft ( Int32 totalWidth , Char paddingChar ) String public PadRight ( Int32 totalWidth ) String public PadRight ( Int32 totalWidth , Char paddingChar ) String public Remove ( Int32 startIndex ) String public Remove ( Int32 startIndex , Int32 count ) String public Replace ( Char oldChar , Char newChar ) String public Replace ( String oldValue , String newValue ) String public Split ( Char separator , Int32 count , StringSplitOptions options ) String public Split ( String separator , Int32 count , StringSplitOptions options ) String public Split ( Char separator , StringSplitOptions options ) String public Split ( Char separator ) String public Split ( Char separator , Int32 count ) String public Split ( String separator , StringSplitOptions options ) String public StartsWith ( String value , StringComparison comparisonType ) Boolean public StartsWith ( String value ) Boolean public StartsWith ( String value , Boolean ignoreCase , CultureInfo culture ) Boolean public Substring ( Int32 startIndex ) String public Substring ( Int32 startIndex , Int32 length ) String public ToCharArray ( ) Char public ToCharArray ( Int32 startIndex , Int32 length ) Char public ToLower ( CultureInfo culture ) String public ToLower ( ) String public ToLowerInvariant ( ) String public ToString ( ) String public ToString ( IFormatProvider provider ) String public ToUpper ( ) String public ToUpper ( CultureInfo culture ) String public ToUpperInvariant ( ) String public Trim ( ) String public Trim ( Char trimChars ) String public TrimEnd ( Char trimChars ) String public TrimStart ( Char trimChars ) String

An instance of String is said to be "immutable" because its value cannot be modified once it has been created. Methods that appear to modify a String instance actually return a new instance containing the modification. Use the StringBuilder class if it is necessary to actually modify the contents of a string-like object.

An "index" is the position of a character within a string, and is counted starting from the first character in the string, which is index position zero. That is, a string index is said to be "zero-based".

Comparison and search procedures are case-sensitive and use the culture associated with the current thread, unless specified otherwise. For more information about the current culture, see the CurrentCulture topic.

By definition, any String, including the empty string ( "" ), compares greater than a null reference; and two null references compare equal to each other.

Use the Compare and Equals methods to perform combined reference and value comparisons of Object and String instances. The equality and inequality relational operators are implemented with the Equals method and can also be used to make reference and value comparisons.

This class implements the IComparable, ICloneable, IConvertible, and IEnumerable interfaces. Use the Convert class for conversions instead of this type's explicit interface member implementation of IConvertible.

IComparable   ICloneable   IConvertible   IEnumerable   StringBuilder   CultureInfo   Formatting Base Types

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