TriState.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 / fx / src / CommonUI / System / Drawing / Printing / TriState.cs / 1305376 / TriState.cs
                        

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

namespace System.Drawing.Printing { 
 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System;

    [Serializable]
    internal struct TriState { 
        private byte value; // 0 is "default", not false
 
        public static readonly TriState Default = new TriState(0); 
        public static readonly TriState False = new TriState(1);
        public static readonly TriState True = new TriState(2); 

        private TriState(byte value) {
            this.value = value;
        } 

        public bool IsDefault { 
            get { return this == Default;} 
        }
 
        public bool IsFalse {
            get { return this == False;}
        }
 
        public bool IsNotDefault {
            get { return this != Default;} 
        } 

        public bool IsTrue { 
            get { return this == True;}
        }

        public static bool operator ==(TriState left, TriState right) { 
            return left.value == right.value;
        } 
 
        public static bool operator !=(TriState left, TriState right) {
            return !(left == right); 
        }

        public override bool Equals( object o ) {
            TriState state = (TriState)o; 
            return this.value == state.value;
        } 
 
        public override int GetHashCode() {
            return value; 
        }

        public static implicit operator TriState(bool value) {
            return(value) ? True : False; 
        }
 
        public static explicit operator bool(TriState value) { 
            if (value.IsDefault)
                throw new InvalidCastException(SR.GetString(SR.TriStateCompareError)); 
            else
                return(value == TriState.True);
        }
 
        /// 
        ///  
        ///  
        ///    
        ///       Provides some interesting information about the TriState in 
        ///       String form.
        ///    
        /// 
        public override string ToString() { 
            if (this == Default) return "Default";
            else if (this == False) return "False"; 
            else return "True"; 
        }
    } 
}


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

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