public static DefaultConstructorHandler CreateDefaultConstructorMethod(Type type)
{
if (type == Types.String)
{
DefaultConstructorHandler s = () => null;
return(s);
}
//if (binderType.IsValueType)
//{
// var dm = new DynamicMethod(string.Empty, binderType, Type.EmptyTypes, Module, true);
// var ilGen = dm.GetILGenerator();
// ilGen.Emit(OpCodes.Ldloc_0);
// ilGen.Emit(OpCodes.Stloc_1);
// ilGen.Emit(OpCodes.Br_S);
// ilGen.Emit(OpCodes.Ldloc_1);
// ilGen.Emit(OpCodes.Ret);
// return dm.CreateDelegate(typeof(DefaultConstructorHandler)) as DefaultConstructorHandler;
//}
var ctorExpression = Expression
.Lambda <DefaultConstructorHandler>(
Expression
.Convert(Expression.New(type), typeof(object)));
return(ctorExpression.Compile());
}
public ClassMapper(Type fromType, Type toType)
: base(fromType, toType)
{
if (!toType.IsAbstract)
{
if (toType.IsNullable())
Ctor = DynamicMethodFactory.GetDefaultCreator(Nullable.GetUnderlyingType(toType));
else
Ctor = DynamicMethodFactory.GetDefaultCreator(toType);
}
}
public DataRowMapper(Type toType)
: base(typeof(DataRow), toType)
{
if (!toType.IsAbstract)
{
if (toType.IsNullable())
Ctor = DynamicMethodFactory.GetDefaultCreator(Nullable.GetUnderlyingType(toType));
else
Ctor = DynamicMethodFactory.GetDefaultCreator(toType);
}
}
public DataRowMapper(Type toType)
: base(typeof(DataRow), toType)
{
if (!toType.IsAbstract)
{
if (toType.IsNullable())
Ctor = DynamicMethodFactory.GetDefaultCreator(Nullable.GetUnderlyingType(toType));
else
Ctor = DynamicMethodFactory.GetDefaultCreator(toType);
}
}
public ClassMapper(Type fromType, Type toType)
: base(fromType, toType)
{
if (!toType.IsAbstract)
{
if (toType.IsNullable())
{
Ctor = DynamicMethodFactory.GetDefaultCreator(Nullable.GetUnderlyingType(toType));
}
else
{
Ctor = DynamicMethodFactory.GetDefaultCreator(toType);
}
}
}
private static object ToEntitySet <T>(IEnumerable <T> items)
{
var entitySetType = EntitySetType.MakeGenericType(typeof(T));
var key = entitySetType.TypeHandle.Value.GetHashCode();
DefaultConstructorHandler ctor = null;
if (!EntitySetCtorCache.TryGetValue(key, out ctor))
{
ctor = entitySetType.GetDefaultCreator();
lock (EntitySetCtorCache)
EntitySetCtorCache[key] = ctor;
}
var entitySet = ctor() as IList <T>;
foreach (var item in items)
{
entitySet.Add(item);
}
return(entitySet);
}
/// <summary>
/// 得到缺省构造函数委托
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static DefaultConstructorHandler GetDefaultCreator(this Type type)
{
Guard.NotNull(type, "type");
var ctor = DefaultDynamicMethodFactory.CreateDefaultConstructorMethod(type);
DefaultConstructorHandler handler = () =>
{
try
{
return(ctor());
}
catch (TargetInvocationException ex)
{
throw ex.InnerException;
}
catch (Exception ex)
{
throw ex;
}
};
return(handler);
}
