ExpressionValueProvider
Get and set values for a MemberInfo using dynamic methods.
using Newtonsoft.Json.Utilities;
using System;
using System.Globalization;
using System.Reflection;
namespace Newtonsoft.Json.Serialization
{
public class ExpressionValueProvider : IValueProvider
{
private readonly MemberInfo _memberInfo;
private Func<object, object> _getter;
private Action<object, object> _setter;
public ExpressionValueProvider(MemberInfo memberInfo)
{
ValidationUtils.ArgumentNotNull(memberInfo, "memberInfo");
_memberInfo = memberInfo;
}
public void SetValue(object target, object value)
{
try {
if (_setter == null)
_setter = ExpressionReflectionDelegateFactory.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);
}
}
public object GetValue(object target)
{
try {
if (_getter == null)
_getter = ExpressionReflectionDelegateFactory.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);
}
}
}
}