///// <summary>
///// Create entity(model) object by IDataReader.
///// </summary>
///// <typeparam name="T">Type of Entity(Model)</typeparam>
///// <param name="dr">Related datereader</param>
///// <remarks>Please make sure the Fields Name of Entity(Model)
///// and input daterader are same.</remarks>
///// <returns>Object of Entity(Model)</returns>
//public static T CreateModel<T>(IDataReader dr, bool checkColumn)
//{
// if (dr.Read())
// {
// if (!TypeCache.Keys.Contains(typeof(T)))
// {
// lock (syncRoot)
// {
// if (!TypeCache.Keys.Contains(typeof(T)))
// {
// TypeCache.Add(typeof(T), EmitHelper.GetInstanceCreator(typeof(T)));
// }
// }
// }
// T obj = (T)TypeCache[typeof(T)].Invoke();
// foreach (PropertyInfo p in typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance))
// {
// if (!PropCache.Keys.Contains(p))
// {
// lock (syncRoot)
// {
// if (!PropCache.Keys.Contains(p) && p.CanWrite)
// {
// PropCache.Add(p, EmitHelper.GetPropertySetter(p));
// }
// }
// }
// if (readerExists(dr, p.Name))
// {
// PropCache[p](obj, ChangeType(dr[p.Name], p.PropertyType));
// }
// }
// return obj;
// }
// else
// {
// return default(T);
// }
//}
/// <summary>
/// Create entity(model) object by IDataReader.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="dr"></param>
/// <param name="checkColumn"></param>
/// <returns></returns>
public static T CreateModel <T>(IDataReader dr, bool checkColumn)
{
Type type = typeof(T);
if (!DTOTypeCache.ContainKeys(type))
{
lock (syncRoot)
{
if (!DTOTypeCache.ContainKeys(type))
{
DTOTypeCache.Add(type, EmitHelper.GetInstanceCreator(type));
}
}
}
var columns = GetColumns(dr);
var dtoType = DTOTypeCache.GetDTOType(type);
if (dr.Read())
{
var propertyInfos = dtoType.Properties.Count > 0 && dtoType.Properties.Count >= columns.Count ? dtoType.Properties.Select(o => o.Value.Info).ToArray() : type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
T obj = (T)dtoType.Handler.Invoke();
foreach (PropertyInfo p in propertyInfos)
{
if (!HasColumn(columns, p.Name))
{
continue;
}
if (p.CanWrite && !dtoType.Properties.ContainsKey(p.Name))
{
lock (syncRoot)
{
if (p.CanWrite && !dtoType.Properties.ContainsKey(p.Name))
{
dtoType.Properties.Add(p.Name, new DTOProperty(p, EmitHelper.GetPropertySetter(p)));
}
}
}
if (!p.CanWrite)
{
continue;
}
dtoType.Properties[p.Name].Handler(obj, ChangeType(dr[p.Name], p.PropertyType));
}
return(obj);
}
else
{
return(default(T));
}
}
///// <summary>
///// Create entity(model) object list by IDataReader.
///// </summary>
///// <typeparam name="T">Type of Entity(Model)</typeparam>
///// <param name="dr">Related datereader</param>
///// <remarks>Please make sure the Fields Name of Entity(Model)
///// and input daterader are same.</remarks>
///// <returns>Object list of Entity(Model)</returns>
//public static List<T> CreateModelList<T>(IDataReader dr)
//{
// List<T> list = new List<T>();
// T obj;
// if (!TypeCache.Keys.Contains(typeof(T)))
// {
// lock (syncRoot)
// {
// if (!TypeCache.Keys.Contains(typeof(T)))
// {
// TypeCache.Add(typeof(T), EmitHelper.GetInstanceCreator(typeof(T)));
// }
// }
// }
// DataTable dcc = dr.GetSchemaTable();
// while (dr.Read())
// {
// obj = (T)TypeCache[typeof(T)].Invoke();
// foreach (PropertyInfo p in typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance))
// {
// if (!HasColumn(dcc, p.Name))
// continue;
// if (!PropCache.Keys.Contains(p))
// {
// lock (syncRoot)
// {
// if (!PropCache.Keys.Contains(p))
// {
// PropCache.Add(p, EmitHelper.GetPropertySetter(p));
// }
// }
// }
// if (p.PropertyType.IsEnum)
// {
// PropCache[p](obj, ChangeType(dr[p.Name], typeof(int)));
// }
// else
// PropCache[p](obj, ChangeType(dr[p.Name], p.PropertyType));
// }
// list.Add(obj);
// }
// return list;
//}
/// <summary>
/// Create entity(model) object list by IDataReader. 已优化
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="dr"></param>
/// <returns></returns>
public static List <T> CreateModelList <T>(IDataReader dr)
{
List <T> list = new List <T>();
T obj;
Type type = typeof(T);
//if (!DTOTypeCache.ContainKeys(type))
//{
// lock (syncRoot)
// {
// if (!DTOTypeCache.ContainKeys(type))
// {
// DTOTypeCache.Add(type, EmitHelper.GetInstanceCreator(type));
// }
// }
//}
if (!DTOTypeCache.ContainKeys(type))
{
lock (syncRoot)
{
if (!DTOTypeCache.ContainKeys(type))
{
DTOTypeCache.Add(type, EmitHelper.GetInstanceCreator(type));
}
}
}
//数据库得到的列名
var columns = GetColumns(dr);
var dtoType = DTOTypeCache.GetDTOType(type);
bool loadProperty = false;
bool loadFinished = false;
IEnumerable <PropertyInfo> propertyInfos = null;
while (dr.Read())
{
if (propertyInfos == null || loadProperty)
{
loadProperty = false;
propertyInfos = dtoType.Properties.Count > 0 && dtoType.Properties.Count >= columns.Count ? dtoType.Properties.Select(o => o.Value.Info).ToArray() : type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
// propertyInfos = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
}
obj = (T)dtoType.Handler.Invoke();
foreach (PropertyInfo p in propertyInfos)
{
if (!loadFinished && !dtoType.Properties.ContainsKey(p.Name))
{
lock (syncRoot)
{
if (p.CanWrite && !dtoType.Properties.ContainsKey(p.Name))
{
dtoType.Properties.Add(p.Name, new DTOProperty(p, EmitHelper.GetPropertySetter(p)));
loadProperty = true;
}
}
}
if (!HasColumn(columns, p.Name) || !p.CanWrite)
{
continue; //属性不在返回的列中
}
var changedValue = ChangeType(dr[p.Name], p.PropertyType);
var py = dtoType.Properties[p.Name];
py.Handler(obj, changedValue);
}
list.Add(obj);
loadFinished = true;
}
return(list);
}