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CollectionUtils.IndexOf Method (this IEnumerable<TSource>, TSource, IEqualityComparer<TSource>)
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Returns the index of the first occurrence in a sequence by using a specified IEqualityComparer.

Syntax
C++
C#
Visual Basic
public: int IndexOf<TSource>( this IEnumerable<TSource> list, TSource value, IEqualityComparer<TSource> comparer );
Parameters
Parameters 
Description 
list 
A sequence in which to locate a value. 
value 
The object to locate in the sequence 
comparer 
An equality comparer to compare values. 
TSource 
The type of the elements of source. 
Returns

The zero-based index of the first occurrence of value within the entire sequence, if found; otherwise, –1.

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