System.String.IndexOf Method

Reports the zero-based index of the first occurrence of the specified string in the current string object. A parameter specifies the type of search to use for the specified string.

Syntax

public int IndexOf (string value, StringComparison comparisonType)

Parameters

value
The string to seek.
comparisonType
One of the enumeration values that specifies the rules for the search.

Returns

The index position of the value parameter if that string is found, or -1 if it is not. If value is string.Empty, the return value is 0.

Remarks

Index numbering starts from zero.

The comparisonType parameter specifies to search for the value parameter using the current or invariant culture, using a case-sensitive or case-insensitive search, and using word or ordinal comparison rules.

Requirements

Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0
Since: .NET 2.0