System.String.IndexOf Method

Reports the zero-based index of the first occurrence of the specified Unicode character in this string.


public int IndexOf (char value)


A Unicode character to seek.


The zero-based index position of value if that character is found, or -1 if it is not.


Index numbering starts from zero.

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 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.


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