Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Printing / TriState.cs / 1 / 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); } ////// /// /// 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. // Copyright (c) Microsoft Corporation. All rights reserved./// Provides some interesting information about the TriState in /// String form. /// ///
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