Question

我有这个扩展方法，它将DataTable转换为List，

    public static List<T> ToList<T>(this DataTable table) where T : new()
    {
        var map = new List<Tuple<DataColumn, PropertyInfo>>();
        foreach (var pi in typeof(T).GetProperties())
        {
            if (table.Columns.Contains(pi.Name))
            {
                map.Add(new Tuple<DataColumn, PropertyInfo>(table.Columns[pi.Name], pi));
            }
        }
        var list = new List<T>(table.Rows.Count);
        foreach (DataRow row in table.Rows)
        {
            var item = new T();
            foreach (var pair in map)
            {
                object value = row[pair.Item1];
                if (value is DBNull)
                {
                    value = null;
                }
                var prop = pair.Item2;
                prop.SetValue(item, Convert.ChangeType(value, prop.PropertyType), null);
            }
            list.Add(item);
        }
        return list;
    }

但是大部分时间我都有复杂的对象类，比如

public enum ServiceCenterType
{
    MOLOffice = 1,
    Tasheel = 2
}

public class ServiceCenter : BusinessObjectEntity
{
    public ServiceCenter()
    {
        Location = new Location();
        Contact = new Contact();
    }

    public Contact Contact { get; set; }
    public Location Location { get; set; }
    public ServiceCenterType Type { get; set; }
}

public class Location
{
    public double Latitude { get; set; }
    public double Longitude { get; set; }
}
public class Contact
{
    public string Address { get; set; }
    public string Telephone { get; set; }
    public string Mobile { get; set; }
    public string Fax { get; set; }
    public string Email { get; set; }
    public string Website { get; set; }
    public string Twitter { get; set; }
    public string Facebook { get; set; }
    public Emirates Emirate { get; set; }
}

在我的DataTable中，我有像Contact.Address，Location.Latitude等列？如何修改上述扩展方法以支持我的场景？

Answer 1

您也应该从类中获取字段，然后再次跟踪它们的属性

FieldInfo[] fields =  typeof(T).GetFields(); // Obtain all fields
foreach (var field in fields) // Loop through fields
{
    foreach (var pi in typeof(T).GetProperties())
    {
    }
}

具有复杂对象的DataTable列表？

1 个答案: