String.LastIndexOfAny Method (Char[], Int32, Int32)
Updated: October 2010
Reports the zero-based index position of the last occurrence in this instance of one or more characters specified in a Unicode array. The search starts at a specified character position and examines a specified number of character positions.
Namespace: System
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.
- count
- Type: System.Int32
The number of character positions to examine.
Return Value
Type: System.Int32The index position of the last occurrence in this instance where any character in anyOf was found; otherwise, -1 if no character in anyOf was found or if the current instance equals String.Empty.
| Exception | Condition |
|---|---|
| ArgumentNullException | anyOf is a null reference (Nothing in Visual Basic). |
| ArgumentOutOfRangeException | The current instance does not equal String.Empty, and count or startIndex is negative. -or- The current instance does not equal String.Empty and startIndex minus count specifies a position that is not within this instance. |
Index numbering starts from zero.
This method begins searching at the startIndex character position of this instance and proceeds backward toward the beginning until either a character in anyOf is found or count character positions have been examined. The search 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 values are the same. To perform a culture-sensitive search, use the CompareInfo.LastIndexOf 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.
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