The object class calls the static method in the generic parent class to execute CRUD -- the first version, static crud

The object class calls the static method in the generic parent class to execute CRUD -- the first version, static crud

    public abstract class LYEntityDbContext<DB, T>        where DB : DbContext, new()        where T : LYEntityDbContext<DB, T> {        public void GenerateHashCode() {            var thisTime = this.GetType().GetProperties().Select(p => p.GetValue(this).GetHashCode());            this.changes.Add(thisTime);        }        private List<IEnumerable<int>> changes = new List<IEnumerable<int>>();        private bool executed = true;        private bool hasChanged {            get {                if (this.changes.Count < 2) {                    return false;                }                var result = !this.changes.First().Except(this.changes.Last()).Any();                return result;            }        }        public bool Executed() {            return this.executed;        }        public static IEnumerable<T> Find(Action<T> action, params object[] keyValues) {            return Find(action, true, keyValues);        }        public static IEnumerable<T> Find(Action<T> action, bool inBatch, params object[] keyValues) {            if (inBatch) {                using (var db = new DB()) {                    var hasChanged = false;                    for (int i = 0; i < keyValues.Length; i++) {                        var id = keyValues[i];                        var t = db.Set<T>().Find(id);                        yield return t;                        t.GenerateHashCode();                        action(t);                        t.GenerateHashCode();                        if (!hasChanged) {                            hasChanged = t.hasChanged;                        }                    }                    if (hasChanged) {                        db.SaveChanges();                    }                }            } else {                foreach (var id in keyValues) {                    yield return Find(action, id);                }            }        }        public static T Find(Action<T> action, object id) {            using (var db = new DB()) {                var t = db.Set<T>().Find(id);                t.GenerateHashCode();                action(t);                t.GenerateHashCode();                if (t.hasChanged) {                    try {                        db.SaveChanges();                        t.executed = true;                    } catch (Exception) {                        t.executed = false;                    }                }                return t;            }        }        public static IEnumerable<T> FindAll<P>(Func<T, bool> where, Func<T, P> orderby, int skip, int take, out int all) {            using (var db = new DB()) {                if (where == null) {                    var r = db.Set<T>();                    all = r.Count();                    return r;                }                all = db.Set<T>().Count(where);                if (orderby == null) {                    var r = db.Set<T>().Where(where);                    return r;                }                if (take <= 0) {                    var r = db.Set<T>().Where(where).OrderBy(orderby);                    return r;                }                if (skip <= 0) {                    var r = db.Set<T>().Where(where).OrderBy(orderby).Take(take);                    return r;                }                var rr = db.Set<T>().Where(where).OrderBy(orderby).Skip(skip).Take(take);                return rr;            }        }    }