public async Task <bool> DeleteAsync(List <T> t)
{
bool rs = false;
using (var db = new SurgingtestContext())
{
db.Set <T>().RemoveRange(t);
rs = await db.SaveChangesAsync() == t.Count;
}
return(rs);
}
public async Task <bool> ModifyEntityAsync(T t)
{
bool rs = false;
using (var db = new SurgingtestContext())
{
db.Set <T>().Update(t);
rs = await db.SaveChangesAsync() == 1;
}
return(rs);
}
public async Task <bool> ModifyListAsync(List <T> list)
{
bool rs = false;
using (var db = new SurgingtestContext())
{
db.Set <T>().UpdateRange(list);
rs = await db.SaveChangesAsync() == list.Count;
}
return(rs);
}
public async Task <T> GetEntityAsync(System.Linq.Expressions.Expression <Func <T, bool> > predicate)
{
return(await Task.Run(() =>
{
T obj = null;
using (var db = new SurgingtestContext())
{
obj = db.Set <T>().Where(predicate).FirstOrDefault();
}
return obj;
}));
}
public async Task <bool> AddListAsync(List <T> t)
{
bool rs = false;
using (var db = new SurgingtestContext())
{
await db.Set <T>().AddRangeAsync(t);
rs = await db.SaveChangesAsync() == t.Count;
}
return(rs);
}
public async Task <List <T> > QuerySqlAsync(string sql)
{
return(await Task.Factory.StartNew(() =>
{
List <T> list = null;
using (var db = new SurgingtestContext())
{
IQueryable <T> rs = db.Set <T>().FromSql(sql);
list = rs.ToList();
}
return list;
}));
}
public async Task <List <T> > GetListAsync <TKey>(System.Linq.Expressions.Expression <Func <T, bool> > predicate, System.Linq.Expressions.Expression <Func <T, TKey> > key, int firstRow = 0, int pageSize = 20)
{
return(await Task.Run(() =>
{
List <T> obj = null;
using (var db = new SurgingtestContext())
{
var rs = db.Set <T>().Where(predicate).OrderByDescending(key).Skip(firstRow).Take(pageSize);
if (rs.Count() > 0)
{
obj = rs.ToList();
}
}
return obj;
}));
}