Ado.net利用反射执行SQL得到实体

public Model.orderParent GetTraceIDforID(string orderid)

        {

            string sql = string.Format(" select * from orderParent where Id='{0}'", orderid);

            DataTable dt = new BaseBLL().DataAccess.QueryDataTable(sql);

            if (dt != null && dt.Rows.Count > 0)

            {

                Model.orderParent data = (Model.orderParent)ReflectionHelper.AssignDataSetToModel(dt, (new Model.orderParent()).GetType());

                return data;

            }

            else

            {

                return null;

            }

        }

　　

 

 public static Object AssignDataSetToModel(System.Data.DataTable dt, Type objectType)

        {

            try

            {

                if (dt.Rows.Count <= 0)

                {

                    return null;

                }

                System.Reflection.PropertyInfo[] pis = objectType.GetProperties();

                Object obj = null;

                if (null != pis)

                {

                    Type[] paramTypes = new Type[0];

                    object[] paramArray = new object[0];

                    obj = objectType.GetConstructor(paramTypes).Invoke(paramArray);

                    foreach (PropertyInfo pi in pis)

                    {

                        if (pi.DeclaringType.Equals(objectType))

                        {

                            int colIndex = getColindex(pi.Name, dt);

                            if (pi.PropertyType.Name == "Char" || pi.PropertyType.Name == "Int32" || pi.PropertyType.Name == "Single" || pi.PropertyType.Name == "Decimal" || pi.PropertyType.Name == "DateTime" || pi.PropertyType.Name == "Boolean")

                            {



                                if (pi.PropertyType.Name == "Int32")

                                    pi.SetValue(obj, dt.Rows[0][colIndex] == DBNull.Value ? 0 : Convert.ToInt32(dt.Rows[0][colIndex]), null);

                                else if (pi.PropertyType.Name == "Single")

                                    pi.SetValue(obj, dt.Rows[0][colIndex] == DBNull.Value ? 0 : Convert.ToSingle(dt.Rows[0][colIndex]), null);

                                else if (pi.PropertyType.Name == "Decimal")

                                    pi.SetValue(obj, dt.Rows[0][colIndex] == DBNull.Value ? 0 : Convert.ToDecimal(dt.Rows[0][colIndex]), null);

                                else if (pi.PropertyType.Name == "DateTime")

                                    pi.SetValue(obj, dt.Rows[0][colIndex] == DBNull.Value ? DateTime.MinValue : Convert.ToDateTime(dt.Rows[0][colIndex]), null);

                                else if (pi.PropertyType.Name == "Boolean")

                                    pi.SetValue(obj, dt.Rows[0][colIndex] == DBNull.Value ? false : Convert.ToBoolean(dt.Rows[0][colIndex]), null);

                                else if (pi.PropertyType.Name == "Char")

                                    pi.SetValue(obj, dt.Rows[0][colIndex] == DBNull.Value ? '0' : Convert.ToChar(dt.Rows[0][colIndex]), null);

                            }

                            else

                                pi.SetValue(obj, dt.Rows[0][colIndex] == DBNull.Value ? "" : dt.Rows[0][colIndex], null);



                        }

                    }

                }

                return obj;

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }