private static void Validate(ListNode listNode)
{
if (listNode.Metadata.HasFlag(BindingMetadataFlags.Item) && listNode.Metadata.Parent.Composition?.Add == null)
{
throw BindingException.FromMetadata(listNode.Metadata.Parent, $"List add method not found.");
}
}
private Expression GetValueReaderProxy(IBindingValueInfo valueInfo)
{
Expression value = valueInfo.Value;
if (value.Type != typeof(object) && value.Type != typeof(string))
{
throw BindingException.FromMetadata(valueInfo.Metadata, $"Cannot deserialize JSON from type '{value.Type.GetSanitizedName()}'.");
}
Expression nullCheck = null;
if (valueInfo.CanBeDbNull)
{
nullCheck = Expression.TypeIs(value, typeof(DBNull));
}
if (valueInfo.CanBeNull)
{
Expression isNull = Expression.ReferenceEqual(value, Expression.Constant(null, value.Type));
if (nullCheck == null)
{
nullCheck = isNull;
}
else
{
nullCheck = Expression.AndAlso(nullCheck, isNull);
}
}
if (value.Type == typeof(object))
{
value = Expression.Convert(value, typeof(string));
}
Expression jsonValue = this.GetJsonDeserializer(valueInfo.Metadata, value, valueInfo.Helper);
if (nullCheck != null)
{
return(Expression.Condition(nullCheck, Expression.Default(jsonValue.Type), jsonValue));
}
return(jsonValue);
}
