Array - LastIndexOf
Searches for the specified object and returns the index of the last occurrence within the entire one-dimensional.
public static void Main() { String[] strings = { "the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog", "in", "the", "barn" }; // Searches for the last occurrence of the duplicated value. String searchString = "the"; // C# Extension Method: Array - LastIndexOf int index = strings.LastIndexOf(searchString); Console.WriteLine("The first occurrence of \"{0}\" is at index {1}.", searchString, index); }
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using System; public static partial class Extensions { /// <summary> /// Searches for the specified object and returns the index of the last occurrence within the entire one- /// dimensional . /// </summary> /// <param name="array">The one-dimensional to search.</param> /// <param name="value">The object to locate in .</param> /// <returns> /// The index of the last occurrence of within the entire , if found; otherwise, the lower bound of the array /// minus 1. /// </returns> public static Int32 LastIndexOf(this Array array, Object value) { return Array.LastIndexOf(array, value); } /// <summary> /// Searches for the specified object and returns the index of the last occurrence within the range of elements /// in the one-dimensional that extends from the first element to the specified index. /// </summary> /// <param name="array">The one-dimensional to search.</param> /// <param name="value">The object to locate in .</param> /// <param name="startIndex">The starting index of the backward search.</param> /// <returns> /// The index of the last occurrence of within the range of elements in that extends from the first element to , /// if found; otherwise, the lower bound of the array minus 1. /// </returns> public static Int32 LastIndexOf(this Array array, Object value, Int32 startIndex) { return Array.LastIndexOf(array, value, startIndex); } /// <summary> /// Searches for the specified object and returns the index of the last occurrence within the range of elements /// in the one-dimensional that contains the specified number of elements and ends at the specified index. /// </summary> /// <param name="array">The one-dimensional to search.</param> /// <param name="value">The object to locate in .</param> /// <param name="startIndex">The starting index of the backward search.</param> /// <param name="count">The number of elements in the section to search.</param> /// <returns> /// The index of the last occurrence of within the range of elements in that contains the number of elements /// specified in and ends at , if found; otherwise, the lower bound of the array minus 1. /// </returns> public static Int32 LastIndexOf(this Array array, Object value, Int32 startIndex, Int32 count) { return Array.LastIndexOf(array, value, startIndex, count); } }