internal static IntPtr SelectScalar(ForeachFunc foreachFunc, string filterExpression,
CloneFunc cloneFunc)
{
using (var filter = QueryArguments.CreateNativeHandle(filterExpression))
{
IntPtr handle = IntPtr.Zero;
foreachFunc(filter, (itemHandle, _) =>
{
cloneFunc(out handle, itemHandle);
return(false);
}).ThrowIfError("Failed to execute query");
return(handle);
}
}
/// <summary>
/// IL动态代码(Emit)，复制（实体及列表）
/// 并行处理列表复制
/// </summary>
internal static object CloneObject(object obj, bool depth)
{
if (obj is IList list)
{
var type = list.GenericType();
Delegate action;
lock (SyncRoot)
{
if (!CloneAction.TryGetValue(type.FullName + "." + depth, out action))
{
action = CloneBuilder.CloneAction(type, depth);
CloneAction.Add(type.FullName + "." + depth, action);
}
}
var iList = type.GenericList();
for (int i = 0; i < list.Count; i++)
{
iList.Add(Activator.CreateInstance(type));
}
Parallel.For(0, list.Count, (i) =>
{
((Action <object, object>)action)(list[i], iList[i]);
});
return(iList);
}
else if (obj != null)
{
var type = obj.GetType();
Delegate func;
lock (SyncRoot)
{
if (!CloneFunc.TryGetValue(type.FullName + "." + depth, out func))
{
func = CloneBuilder.CloneFunc(type, depth);
CloneFunc.Add(type.FullName + "." + depth, func);
}
}
return(((Func <object, object>)func)(obj));
}
return(null);
}
