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tangxu

2024-10-22 4d9fe5ed98ceb6b8fe9dc52ebfb80860ad1aee99

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using System;
using System.Globalization;
using System.Reflection;
using DPumpHydr.WinFrmUI.WenSkin.Json.Utilities;
 
namespace DPumpHydr.WinFrmUI.WenSkin.Json.Serialization
{
    /// <summary>
    /// Get and set values for a <see cref="T:System.Reflection.MemberInfo" /> using dynamic methods.
    /// </summary>
    public class DynamicValueProvider : IValueProvider
    {
        private readonly MemberInfo _memberInfo;
 
        private Func<object, object> _getter;
 
        private Action<object, object> _setter;
 
        /// <summary>
        /// Initializes a new instance of the <see cref="T:Newtonsoft.Json.Serialization.DynamicValueProvider" /> class.
        /// </summary>
        /// <param name="memberInfo">The member info.</param>
        public DynamicValueProvider(MemberInfo memberInfo)
        {
            ValidationUtils.ArgumentNotNull(memberInfo, "memberInfo");
            _memberInfo = memberInfo;
        }
 
        /// <summary>
        /// Sets the value.
        /// </summary>
        /// <param name="target">The target to set the value on.</param>
        /// <param name="value">The value to set on the target.</param>
        public void SetValue(object target, object value)
        {
            try
            {
                if (_setter == null)
                {
                    _setter = DynamicReflectionDelegateFactory.Instance.CreateSet<object>(_memberInfo);
                }
                _setter(target, value);
            }
            catch (Exception innerException)
            {
                throw new JsonSerializationException("Error setting value to '{0}' on '{1}'.".FormatWith(CultureInfo.InvariantCulture, _memberInfo.Name, target.GetType()), innerException);
            }
        }
 
        /// <summary>
        /// Gets the value.
        /// </summary>
        /// <param name="target">The target to get the value from.</param>
        /// <returns>The value.</returns>
        public object GetValue(object target)
        {
            try
            {
                if (_getter == null)
                {
                    _getter = DynamicReflectionDelegateFactory.Instance.CreateGet<object>(_memberInfo);
                }
                return _getter(target);
            }
            catch (Exception innerException)
            {
                throw new JsonSerializationException("Error getting value from '{0}' on '{1}'.".FormatWith(CultureInfo.InvariantCulture, _memberInfo.Name, target.GetType()), innerException);
            }
        }
    }
}