Columns.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 / Services / Messaging / System / Messaging / Interop / Columns.cs / 1305376 / Columns.cs
                        

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

namespace System.Messaging.Interop { 
    using System.Runtime.InteropServices; 

    using System.Diagnostics; 

    using System;
    using System.ComponentModel;
    using System.Globalization; //for CultureInfo 
    using Microsoft.Win32;
 
    internal class Columns { 
        private int maxCount;
        private MQCOLUMNSET columnSet = new MQCOLUMNSET(); 

        public Columns(int maxCount) {
            this.maxCount = maxCount;
            this.columnSet.columnIdentifiers = Marshal.AllocHGlobal(maxCount * 4); 
            this.columnSet.columnCount = 0;
        } 
 
        public virtual void  AddColumnId(int columnId) {
            lock(this) { 
                if (this.columnSet.columnCount >= this.maxCount)
                    throw new InvalidOperationException(Res.GetString(Res.TooManyColumns, this.maxCount.ToString(CultureInfo.CurrentCulture)));

                ++ this.columnSet.columnCount; 
                this.columnSet.SetId(columnId, this.columnSet.columnCount - 1);
            } 
        } 

        public virtual MQCOLUMNSET GetColumnsRef() { 
            return this.columnSet;
        }

        [StructLayout(LayoutKind.Sequential)] 
        public class MQCOLUMNSET{
            public int columnCount; 
 
            [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")]
            public IntPtr columnIdentifiers; 

            ~MQCOLUMNSET() {
                if (this.columnIdentifiers != (IntPtr)0) {
                    Marshal.FreeHGlobal(this.columnIdentifiers); 
                    this.columnIdentifiers = (IntPtr)0;
                } 
            } 

            public virtual void SetId(int columnId, int index) { 
                Marshal.WriteInt32((IntPtr)((long)this.columnIdentifiers + (index * 4)), columnId);
            }
        }
    } 
}

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

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