NumberEdit.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / Util / NumberEdit.cs / 1 / NumberEdit.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

// NumberEdit.cs 
// 
// 3/18/99: [....]: created
// 

namespace System.Web.UI.Design.Util {
    using System.ComponentModel;
    using System.Design; 
    using System.Diagnostics;
    using System.Drawing; 
    using System.Globalization; 
    using System.Runtime.Serialization.Formatters;
    using System.Windows.Forms; 

    /// 
    /// 
    ///    Provides an edit control that only accepts numbers with addition 
    ///    restrictions such as whether negatives and decimals are allowed
    ///  
    ///  
    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
    internal sealed class NumberEdit : TextBox { 
        private bool allowNegative = true;
        private bool allowDecimal = true;

        ///  
        /// 
        ///    Controls whether the edit control allows negative values 
        ///  
        public bool AllowDecimal {
            get { 
                return allowDecimal;
            }
            set {
                allowDecimal = value; 
            }
        } 
 
        /// 
        ///  
        ///    Controls whether the edit control allows negative values
        /// 
        public bool AllowNegative {
            get { 
                return allowNegative;
            } 
            set { 
                allowNegative = value;
            } 
        }


        ///  
        /// 
        ///    Override of wndProc to listen to WM_CHAR and filter out invalid 
        ///    key strokes. Valid keystrokes are: 
        ///    0...9,
        ///    '.' (if fractions allowed), 
        ///    '-' (if negative allowed),
        ///    BKSP.
        ///    A beep is generated for invalid keystrokes
        ///  
        protected override void WndProc(ref Message m) {
            if (m.Msg == NativeMethods.WM_CHAR) { 
                char ch = (char)m.WParam; 
                if (!(((ch >= '0') && (ch <= '9')) ||
                      (NumberFormatInfo.CurrentInfo.NumberDecimalSeparator.Contains(ch.ToString(CultureInfo.CurrentCulture)) && allowDecimal) || 
                      (NumberFormatInfo.CurrentInfo.NegativeSign.Contains(ch.ToString(CultureInfo.CurrentCulture)) && allowNegative) ||
                      (ch == (char)8))) {
                    System.Console.Beep();
                    return; 
                }
            } 
            base.WndProc(ref m); 
        }
    } 
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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