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ArrayIndexOf Method (Array, Object, Int32, Int32)
Searches for the specified object and returns the index of the first occurrence within the range of elements in the one-dimensional Array that starts at the specified index and contains the specified number of elements.

Namespace: System
Assembly: mscorlib (in mscorlib.dll) Version: 4.0.0.0
Syntax
C#
Copy
public static int IndexOf(
	Array array,
	Object value,
	int startIndex,
	int count
)

Parameters

array
Type: SystemArray
The one-dimensional Array to search.
value
Type: SystemObject
The object to locate in array.
startIndex
Type: SystemInt32
The starting index of the search. 0 (zero) is valid in an empty array.
count
Type: SystemInt32
The number of elements in the section to search.

Return Value

Type: Int32
The index of the first occurrence of value within the range of elements in array that starts at startIndex and contains the number of elements specified in count, if found; otherwise, the lower bound of the array minus 1.
Exceptions
ExceptionCondition
ArgumentNullExceptionarray is null.
ArgumentOutOfRangeExceptionstartIndex is outside the range of valid indexes for array.-or-count is less than zero.-or-startIndex and count do not specify a valid section in array.
RankExceptionarray is multidimensional.
See Also