System Namespace String Class
Reports the index of the first occurrence of a given Unicode character in the given String. The search starts at a specified character position.
[ VB ]
<Serializable>
Overloads Public Function IndexOf ( _
ByVal value As Char, _
ByVal startIndex As Integer _
) As Integer
[ C# ]
[ Serializable ]
public int IndexOf (
char value,
int startIndex
);
[ C++ ]
[ Serializable ]
public: int IndexOf (
__wchar_t value,
int startIndex
);
[ JScript ]
public Serializable
function IndexOf (
value : Char,
startIndex : int
) : int;
- value
- A Unicode character to seek.
- startIndex
- The search starting position.
A positive 32-bit signed integer, the index, indicating the character position in the given String where value was found; otherwise, -1 if value was not found.
| Exception Type |
Condition |
| ArgumentOutOfRangeException |
startIndex is less than zero or specifies a position beyond the end of this instance. |
Index numbering starts from zero.
The search ranges from startIndex to the end of the string.
The search for value is case-sensitive.
This method performs an ordinal ( culture-insensitive ) search, where a character is considered equivalent to another character only if the Unicode values are the same. To perform a culture-sensitive search, use the CompareInfo.IndexOf method, where a Unicode 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.
String Members String.IndexOf Overload List Int32 Char IndexOfAny LastIndexOf LastIndexOfAny
