Newtonsoft.Json/JsonExtensionDataAttribute.cs

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using System;

namespace Newtonsoft.Json
{
    /// <summary>
    /// Instructs the <see cref="JsonSerializer"/> to deserialize properties with no matching class member into the specified collection
    /// and write values during serialization.
    /// </summary>
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)]
    public class JsonExtensionDataAttribute : Attribute
    {
        /// <summary>
        /// Gets or sets a value that indicates whether to write extension data when serializing the object.
        /// </summary>
        /// <value>
        /// 	<c>true</c> to write extension data when serializing the object; otherwise, <c>false</c>. The default is <c>true</c>.
        /// </value>
        public bool WriteData { get; set; }

        /// <summary>
        /// Gets or sets a value that indicates whether to read extension data when deserializing the object.
        /// </summary>
        /// <value>
        /// 	<c>true</c> to read extension data when deserializing the object; otherwise, <c>false</c>. The default is <c>true</c>.
        /// </value>
        public bool ReadData { get; set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="JsonExtensionDataAttribute"/> class.
        /// </summary>
        public JsonExtensionDataAttribute()
        {
            WriteData = true;
            ReadData = true;
        }
    }
}