String.IndexOf Method (Char, Int32, Int32)
Reports the zero-based index of the first occurrence of the specified character in this instance. The search starts at a specified character position and examines a specified number of character positions.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
-
Type:
System.Char
A Unicode character 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 zero-based index position of value from the start of the string if that character is found, or -1 if it is not.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | count or startIndex is negative. -or- startIndex is greater than the length of this string. -or- count is greater than the length of this string minus startIndex. |
The search begins at startIndex and continues to startIndex + count -1. The character at startIndex + count is not included in the search.
Index numbering starts from 0 (zero). The startIndex parameter can range from 0 to the length of the string instance.
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 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1