最好的办法是检查，然后删除

        if (ctx.Employ.Any(r=>r.Id == entity.Id))
        {
            Employ rec = new Employ() { Id = entity.Id };
            ctx.Entry(rec).State = EntityState.Deleted;
            ctx.SaveChanges();
        }

我使用实体框架与LINQ。下面的代码对我很有帮助;

1-用于多条记录

 using (var dbContext = new Chat_ServerEntities())
 {
     var allRec= dbContext.myEntities;
     dbContext.myEntities.RemoveRange(allRec);
     dbContext.SaveChanges();
 }

2-单张唱片

 using (var dbContext = new Chat_ServerEntities())
 {
     var singleRec = dbContext.ChatUserConnections.FirstOrDefault( x => x.ID ==1);// object your want to delete
     dbContext.ChatUserConnections.Remove(singleRec);
     dbContext.SaveChanges();
 }

最好的办法是检查，然后删除

        if (ctx.Employ.Any(r=>r.Id == entity.Id))
        {
            Employ rec = new Employ() { Id = entity.Id };
            ctx.Entry(rec).State = EntityState.Deleted;
            ctx.SaveChanges();
        }

对于泛型DAO，这是可行的:

    public void Delete(T entity)
    {
        db.Entry(entity).State = EntityState.Deleted;
        db.SaveChanges();
    }

不需要先查询对象，可以通过它的id将它附加到上下文。 是这样的:

var employer = new Employ { Id = 1 };
ctx.Employ.Attach(employer);
ctx.Employ.Remove(employer);
ctx.SaveChanges();

或者，你可以将附加条目的状态设置为已删除:

var employer = new Employ { Id = 1 };
ctx.Entry(employer).State = EntityState.Deleted;
ctx.SaveChanges();

Employer employer = context.Employers.First(x => x.EmployerId == 1);

context.Customers.DeleteObject(employer);
context.SaveChanges();