实体框架加上日期时间批量删除不起作用

Question

I have run into a scenario where I need to bulk delete on a specific date time. It seems that the EF+ batch delete function doesn't correctly equate date time and perform the action.

It does work fine on other field types, but just not DateTime. Is there some special formatting I should be doing to perform this action properly?

The backend SQL Server table has the FileCreatedDate as DateTime2(7) . And records all contain the DateTime.UtcNow date/time that is specified in the code, since an initial pass prior to this code created those records. This is a fallback to clean out the records that got created if an error occurred.

I have the following code:

var fileCreatedDate = DateTime.UtcNow;

using (var db = new MyContextDb())
{
    db.SampleModel.Where(e => e.FileCreatedDate == fileCreatedDate).Delete();
}

This code doesn't work. It doesn't delete the records whose time matches the criteria.

Any ideas what might be the problem?

Answer 1

Can you try to remove the entities using range?

like so:

db.SampleModel.RemoveRange(db.SampleModel.Where(e => e.FileCreatedDate == fileCreatedDate));
db.SaveChanges();