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String.IndexOfAny Method (Char[], Int32, 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 and examines a specified number of character positions.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

member IndexOfAny : 
        anyOf:char[] *
        startIndex:int *
        count:int -> int


Type: System.Char[]

A Unicode character array containing one or more characters to seek.

Type: System.Int32

The search starting position.

Type: System.Int32

The number of character positions to examine.

Return Value

Type: System.Int32

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.

Exception Condition

anyOf is null.


count or startIndex is negative.


count + startIndex is greater than the number of characters in this instance.

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 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 "aid" within a substring of another string.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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