public static Expression <Func <IFields, TDestiny> > GetMemberInit <TDestiny>(IFields fields, bool useXmlAttributes = true)
where TDestiny : new()
{
var typeOfDestiny = typeof(TDestiny);
var props = ObjectHelpers.LoadProperties(typeOfDestiny, p => p.CanWrite, useXmlAttributes);
var typeOfFields = typeof(IFields);
var methodField = typeOfFields.GetMethod("Item");
var propertyValue = typeof(IField).GetProperty("Value");
var count = fields.Count;
var paramSource = Expression.Parameter(typeOfFields, "fields");
var bindings = new List <MemberBinding>(count);
for (var i = 0; i < count; ++i)
{
var field = fields.Item(i);
PropertyInfo propertyInfo;
if (!props.TryGetValue(field.Name, out propertyInfo))
{
continue;
}
MemberBinding binding;
var value = Expression.Property(
Expression.Call(paramSource, methodField, Expression.Constant(i, ObjectHelpers.TypeOfObject)), propertyValue);
if (propertyInfo.PropertyType.Name == "Boolean" && field.Type == BoFieldTypes.db_Alpha && field.Size == 1)
{
binding = Expression.Bind(
propertyInfo,
Expression.Equal(Expression.Convert(value, ObjectHelpers.TypeOfString), Expression.Constant("Y")));
//binding = Expression.Bind(propertyInfo, Expression.Condition(
// Expression.Equal(
// Expression.Convert(value, typeOfString),
// Expression.Constant("Y")),
// Expression.Constant(true),
// Expression.Constant(false)));
}
else
{
binding = Expression.Bind(propertyInfo, Expression.Convert(value, propertyInfo.PropertyType));
}
bindings.Add(binding);
}
var lambda = Expression.Lambda <Func <IFields, TDestiny> >(
Expression.MemberInit(Expression.New(typeOfDestiny), bindings),
new[] { paramSource });
return(lambda);
}