// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Runtime.CompilerServices;
using System.IO;
 
namespace System.Windows
{
    internal static class BinaryWriterExtensions
    {
        /// <summary>
        ///  Writes a <see cref="DateTime"/> object to the given <paramref name="writer"/>.
        /// </summary>
        public static void Write(this BinaryWriter writer, DateTime value)
        {
            // Copied from System.Runtime.Serialization.Formatters.Binary.BinaryFormatterWriter
 
            // In .NET Framework, BinaryFormatter is able to access DateTime's ToBinaryRaw,
            // which just returns the value of its sole Int64 dateData field.  Here, we don't
            // have access to that member (which doesn't even exist anymore, since it was only for
            // BinaryFormatter, which is now in a separate assembly).  To address that,
            // we access the sole field directly via an unsafe cast.
            long dateData = Unsafe.As<DateTime, long>(ref value);
            writer.Write(dateData);
        }
    }
}