System.String.IndexOfAny Method

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 and examines a specified number of character positions.

Syntax

public int IndexOfAny (char[] anyOf, int startIndex, int count)

Parameters

anyOf
A Unicode character array containing one or more characters to seek.
startIndex
The search starting position.
count
The number of character positions to examine.

Returns

The 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.

Exceptions

TypeReason
ArgumentNullException anyOf is a null reference.
ArgumentOutOfRangeException

startIndex or count is negative.

-or-

startIndex + count is greater than the length of the current instance.

Remarks

The search begins at startIndex and continues to startIndex + count -1. The character at startIndex + count is not included in the search.

Index numbering starts from zero. The startIndex parameter can range from 0 to one less than the length of the string instance.

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 System.Globalization.CompareInfo.IndexOf(string, char) 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.

Requirements

Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0