/// <summary>
/// 从DataRow读取数据并映射到范型T这里要求T必须有一个默认的无参构造函数
/// 如：
/// var cmdt = @"select p.BlocNo AS B_BlocNo from S_UIFilterFieldPlan p left join S_UIFilterFields f on p.SUIFilterFieldID=f.SUIFilterFieldID";
/// var row = DBHelper.ExecuteDataRow(cmdt, Provider);
/// var obj = DataMapping.ToModel(S_UIFilterFieldPlan)(row, s => new Dictionary(object,string) { { s.UIFilterFields, "B_" } });
/// </summary>
/// <typeparam name="T">要映射的数据类型T</typeparam>
/// <param name="reader">System.Data.DataRow</param>
/// <param name="expression">指定有外键关系时外键表使用的别名的一个表达式</param>
/// <returns>映射之后的实例</returns>
public static T ToModel <T>(DataRow row, Expression <Func <T, object> > expression) where T : new()
{
var obj = new T();
ModelBindingProxy proxy = new ModelBindingProxy(typeof(T), expression);
proxy.InitBinding(row.Table);
return((T)proxy.Bind(obj, row));
}
public static object ToModel(object obj, IDataReader reader, ModelBindingProxy proxy)
{
proxy.InitBinding(reader);
using (reader)
{
if (reader.Read())
{
return(proxy.Bind(obj));
}
}
return(null);
}
/// <summary>
/// 从reader读取数据并映射到范型T这里要求T必须有一个默认的无参构造函数
/// 如：
/// var cmdt = @"select p.BlocNo AS B_BlocNo from S_UIFilterFieldPlan p left join S_UIFilterFields f on p.SUIFilterFieldID=f.SUIFilterFieldID";
/// var reader = DBHelper.ExecuteReader(cmdt, Provider);
/// var obj = DataMapping.ToModel(S_UIFilterFieldPlan)(reader, s => new Dictionary(object, string) { { s.UIFilterFields, "B_" } });
/// </summary>
/// <typeparam name="T">要映射的数据类型T</typeparam>
/// <param name="reader">IDataReader</param>
/// <param name="expression">指定有外键关系时外键表使用的别名的一个表达式</param>
/// <returns>映射之后的实例</returns>
public static T ToModel <T>(IDataReader reader, Expression <Func <T, object> > expression) where T : new()
{
var obj = new T();
ModelBindingProxy proxy = new ModelBindingProxy(typeof(T), expression);
proxy.InitBinding(reader);
using (reader)
{
if (reader.Read())
{
return((T)proxy.Bind(obj));
}
}
return(default(T));
}