Array.FindIndex

To find index of a element in array often we use statement for by next way:

static int SearchIndexOfItemInArray_via_for(int[] data, int foundItemValue)
{
 int itemIndex = -1;
 for (int i = 0; i < data.Length; i++)
 {
     if (foundItemValue == data[i])
     {
         itemIndex = i;
         break;
     }
 }
 return itemIndex;
}

C# (2.0) suggests another way to search index of element with help of method Array.FindIndex and delegate:

static int SearchIndexOfItemInArray_via_FindIndex(int[] data, int foundItemValue)
{
 return Array.FindIndex(data, delegate(int item)
                                  {
                                      return item == foundItemValue;
                                  });
}

Additional links:

Array..::.FindIndex<(Of <(T>)>) Generic Method (array<T>[]()[], Predicate<(Of <(T>)>))

Predicate<(Of <(T>)>) Generic Delegate