【转】反射，DataRow转换为实体类（优化）

修改为根据特性赋值，好处是数据库字段变化了，无需修改实体类属性，修改实体类属性很可能造成不必要的麻烦，所以改为用特性，特性的好处是数据库字段变化了只需要修改特性则可，不需要更改实体类属性   

    class Program
    {
        static void Main(string[] args)
        {
            DataTable dt = new DataTable();
            DataColumn dcName = new DataColumn("Name", typeof(string));
            dt.Columns.Add(dcName);
            DataRow row = dt.NewRow();
            row["Name"] = "小强";
            dt.Rows.Add(row);

            Student s = new Student();
            DataBind(s, dt.Rows[0]);
            Console.WriteLine(s.StudentName);
        }
        static void DataBind(object entity, DataRow row)
        {
            Type type = entity.GetType();
            PropertyInfo[] infors = type.GetProperties();
            for (int i = 0; i < infors.Length; i++)
            {
                object[] attributes = infors[i].GetCustomAttributes(typeof(MyAttribute), false);
                if (attributes.Length > 0)
                {
                    MyAttribute attribute = attributes[0] as MyAttribute;
                    if (row.Table.Columns.Contains(attribute.Name))
                    {
                        object value = Convert.ChangeType(row[attribute.Name], infors[i].PropertyType);
                        infors[i].SetValue(entity, value, null);
                    }
                }
            }
        }

    }
    public class Student
    {
        [My("Name")]
        public string StudentName { get; set; }
    }
    [AttributeUsage(AttributeTargets.Property)]
    public class MyAttribute : Attribute
    {
        public string Name { get; set; }
        public MyAttribute(string name)
        {
            this.Name = name;
        }
    }