DesignerTransaction.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / Design / DesignerTransaction.cs / 1 / DesignerTransaction.cs
                        

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

/* 
 */ 
namespace System.ComponentModel.Design {
    using System; 
    using System.Security.Permissions;

    /// 
    ///     Identifies a transaction within a designer.  Transactions are 
    ///     used to wrap serveral changes into one unit of work, which
    ///     helps performance. 
    ///  
    [HostProtection(SharedState = true)]
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name = "FullTrust")] 
    public abstract class DesignerTransaction : IDisposable {
        private bool committed = false;
        private bool canceled = false;
        private bool suppressedFinalization = false; 
        private string desc;
 
        ///  
        ///    [To be supplied.]
        ///  
        protected DesignerTransaction() : this("") {
        }

 
        /// 
        ///    [To be supplied.] 
        ///  
        protected DesignerTransaction(string description) {
            this.desc = description; 
        }


        ///  
        ///    [To be supplied.]
        ///  
        public bool Canceled { 
            get {
                return canceled; 
            }
        }

        ///  
        ///    [To be supplied.]
        ///  
        public bool Committed { 
            get {
                return committed; 
            }
        }

        ///  
        ///    [To be supplied.]
        ///  
        public string Description { 
            get {
                return desc; 
            }
        }

        ///  
        ///    [To be supplied.]
        ///  
        public void Cancel() { 
            if (!canceled && !committed) {
                canceled = true; 
                GC.SuppressFinalize(this);
                suppressedFinalization = true;
                OnCancel();
            } 
        }
 
        ///  
        ///     Commits this transaction.  Once a transaction has
        ///     been committed, further calls to this method 
        ///     will do nothing.  You should always call this
        ///     method after creating a transaction to ensure
        ///     that the transaction is closed properly.
        ///  
        public void Commit() {
            if (!committed && !canceled) { 
                committed = true; 
                GC.SuppressFinalize(this);
                suppressedFinalization = true; 
                OnCommit();
            }
        }
 
          /// 
        ///     User code should implement this method to perform 
        ///     the actual work of committing a transaction. 
        /// 
        protected abstract void OnCancel(); 

        /// 
        ///     User code should implement this method to perform
        ///     the actual work of committing a transaction. 
        /// 
        protected abstract void OnCommit(); 
 
        /// 
        ///     Overrides Object to commit this transaction 
        ///     in case the user forgot.
        /// 
        ~DesignerTransaction() {
            Dispose(false); 
        }
 
        ///  
        /// 
        /// Private implementation of IDisaposable. 
        /// When a transaction is disposed it is
        /// committed.
        /// 
        void IDisposable.Dispose() { 
            Dispose(true);
 
            // note - Dispose calls Cancel which sets this bit, so 
            //        this should never be hit.
            // 
            if (!suppressedFinalization) {
                System.Diagnostics.Debug.Fail("Invalid state. Dispose(true) should have called cancel which does the SuppressFinalize");
                GC.SuppressFinalize(this);
            } 
        }
        protected virtual void Dispose(bool disposing) { 
            System.Diagnostics.Debug.Assert(disposing, "Designer transaction garbage collected, unable to cancel, please Cancel, Close, or Dispose your transaction."); 
            System.Diagnostics.Debug.Assert(disposing || canceled || committed, "Disposing DesignerTransaction that has not been comitted or canceled; forcing Cancel" );
            Cancel(); 
        }
    }
}

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