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StringLastIndexOf Method (String, Int32, Int32, StringComparison)
Reports the zero-based index position of the last occurrence of a specified string within this instance. Parameters specify the starting search position in the current string, the number of characters in the current string to search, and the type of search to use for the specified string.

Namespace: System
Assembly: mscorlib (in mscorlib.dll) Version: 4.0.0.0
Syntax
C#
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public int LastIndexOf(
	string value,
	int startIndex,
	int count,
	StringComparison comparisonType
)

Parameters

value
Type: SystemString
The string to seek.
startIndex
Type: SystemInt32
The search starting position. The search proceeds from startIndex toward the beginning of this instance.
count
Type: SystemInt32
The number of character positions to examine.
comparisonType
Type: SystemStringComparison
One of the enumeration values that specifies the rules for the search.

Return Value

Type: Int32
The index position of the value parameter if that string is found, or -1 if it is not found or if the current instance equals Empty. If value is Empty, the return value is the smaller of startIndex and the last index position in this instance.
Exceptions
ExceptionCondition
ArgumentNullExceptionvalue is null.
ArgumentOutOfRangeExceptioncount is negative.-or-The current instance does not equal Empty, and startIndex is negative.-or- The current instance does not equal Empty, and startIndex is greater than the length of this instance.-or-The current instance does not equal Empty, and startIndex - count + 1 specifies a position that is not within this instance.
ArgumentExceptioncomparisonType is not a valid StringComparison value.
See Also