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.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

member IndexOf : 
        value:char *
        startIndex:int -> int

Parameters

value
Type: System.Char

A Unicode character to seek.

startIndex
Type: System.Int32

The search starting position.

Return Value

Type: 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.

Exception Condition
ArgumentOutOfRangeException

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.

The following example demonstrates the IndexOf method.

No code example is currently available or this language may not be supported.

Universal Windows Platform
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
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