String.IndexOf Method (Char, Int32)
Reports the zero-based index of the first occurrence of the specified Unicode character in this string. The search starts at a specified character position.
Assembly: mscorlib (in mscorlib.dll)
A Unicode character to seek.
The search starting position.
Return ValueType: System.Int32
The zero-based index position of value from the start of the string if that character is found, or -1 if it is not.
startIndex is less than 0 (zero) or greater than the length of the string.
Index numbering starts from 0. The startIndex parameter can range from 0 to the length of the string instance. If startIndex equals the length of the string instance, the method returns -1.
The search ranges from startIndex to the end of the string.
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.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.
Available since 4.5
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1