String::LastIndexOfAny Method (array<Char>, Int32, Int32)
Reports the 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.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- anyOf
- Type: array<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; -1 if no character in anyOf was found or if the current instance equals String::Empty.
| Exception | Condition |
|---|---|
| ArgumentNullException | anyOf is nullptr. |
| 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.
The following example finds the index of the last occurrence of any character in the string "aid" within a substring of another string.
// Sample for String::LastIndexOfAny(Char[], Int32, Int32) using namespace System; int 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; int count; String^ target = "aid"; array<Char>^anyOf = target->ToCharArray(); start = ((str->Length - 1) * 2) / 3; count = (str->Length - 1) / 3; Console::WriteLine( "The last character occurrence from position {0} for {1} characters.", start, count ); 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->LastIndexOfAny( anyOf, start, count ); if ( at > -1 ) Console::Write( at ); else Console::Write( "(not found)" ); Console::Write( "{0}{0}{0}", Environment::NewLine ); } /* This example produces the following results: The last character occurrence from position 44 for 22 characters. 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 'aid' occurs at position: 27 */
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.