String.IndexOfAny Method (Char[], Int32)
Reports the zero-based index of the first occurrence in this instance of any character in a specified array of Unicode characters. The search starts at a specified character position.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- anyOf
-
Type:
System.Char[]
A Unicode character array containing one or more characters to seek.
- startIndex
-
Type:
System.Int32
The search starting position.
Return Value
Type: System.Int32The zero-based index position of the first occurrence in this instance where any character in anyOf was found; -1 if no character in anyOf was found.
| Exception | Condition |
|---|---|
| ArgumentNullException | anyOf is null. |
| ArgumentOutOfRangeException | startIndex is negative. -or- startIndex is greater than the number of characters in this instance. |
Index numbering starts from zero. The startIndex parameter can range from 0 to one less than the length of the string instance.
The search ranges from startIndex to the end of the string.
The search for anyOf is case-sensitive.
This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar value are the same. To perform a culture-sensitive search, use the CompareInfo.IndexOf method, where a Unicode scalar value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture.
The following example finds the index of the occurrence of any character of the string "is" within a substring of another string.
// Sample for String.IndexOfAny(Char[], Int32) using System; class Sample { public static void Main() { string br1 = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-"; string br2 = "0123456789012345678901234567890123456789012345678901234567890123456"; string str = "Now is the time for all good men to come to the aid of their party."; int start; int at; string target = "is"; char[] anyOf = target.ToCharArray(); start = str.Length/2; Console.WriteLine(); Console.WriteLine("The first character occurrence from position {0} to {1}.", start, str.Length-1); Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str); Console.Write("A character in '{0}' occurs at position: ", target); at = str.IndexOfAny(anyOf, start); if (at > -1) Console.Write(at); else Console.Write("(not found)"); Console.WriteLine(); } } /* The first character occurrence from position 33 to 66. 0----+----1----+----2----+----3----+----4----+----5----+----6----+- 0123456789012345678901234567890123456789012345678901234567890123456 Now is the time for all good men to come to the aid of their party. A character in 'is' occurs at position: 49 */
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1