57 lines
1.6 KiB
C#
57 lines
1.6 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="ArraySubsetEnumerator.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.ComponentModel {
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using System;
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using System.Collections;
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using System.Diagnostics;
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using System.Security.Permissions;
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[HostProtection(SharedState = true)]
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internal class ArraySubsetEnumerator : IEnumerator
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{
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private Array array;
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private int total;
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private int current;
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public ArraySubsetEnumerator(Array array, int count) {
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Debug.Assert(count == 0 || array != null, "if array is null, count should be 0");
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Debug.Assert(array == null || count <= array.Length, "Trying to enumerate more than the array contains");
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this.array = array;
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this.total = count;
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current = -1;
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}
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public bool MoveNext() {
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if (current < total - 1) {
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current++;
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return true;
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}
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else {
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return false;
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}
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}
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public void Reset() {
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current = -1;
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}
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public object Current {
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get {
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if (current == -1) {
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throw new InvalidOperationException();
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}
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else {
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return array.GetValue(current);
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}
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}
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}
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}
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}
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