CharEnumerator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / CharEnumerator.cs / 1305376 / CharEnumerator.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class: CharEnumerator 
**
** 
** Purpose: Enumerates the characters on a string.  skips range
**          checks.
**
** 
============================================================*/
namespace System { 
 
    using System.Collections;
    using System.Collections.Generic; 
    using System.Diagnostics.Contracts;

[System.Runtime.InteropServices.ComVisible(true)]
    [Serializable] 
    public sealed class CharEnumerator : IEnumerator, ICloneable, IEnumerator, IDisposable {
        private String str; 
        private int index; 
        private char currentElement;
 
        internal CharEnumerator(String str) {
            Contract.Requires(str != null);
            this.str = str;
            this.index = -1; 
        }
 
        [System.Security.SecuritySafeCritical]  // auto-generated 
        public Object Clone() {
            return MemberwiseClone(); 
        }

        public bool MoveNext() {
            if (index < (str.Length-1)) { 
                index++;
                currentElement = str[index]; 
                return true; 
            }
            else 
                index = str.Length;
            return false;

        } 

        public void Dispose() { 
            if (str != null) 
                index = str.Length;
            str = null; 
        }

        /// 
        Object IEnumerator.Current { 
            get {
                if (index == -1) 
                    throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumNotStarted)); 
                if (index >= str.Length)
                    throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumEnded)); 

                return currentElement;
            }
        } 

        public char Current { 
            get { 
                if (index == -1)
                    throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumNotStarted)); 
                if (index >= str.Length)
                    throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumEnded));
                return currentElement;
            } 
        }
 
        public void Reset() { 
            currentElement = (char)0;
            index = -1; 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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