VS2012里面使用EF框架的增删改查和分页的方法

public class BaseRepository<T> where T : class
{
//实例化EF框架
DataModelContainer db = new DataModelContainer();

//添加
public T AddEntities(T entity)
{
db.Entry<T>(entity).State = EntityState.Added;
db.SaveChanges();
return entity;
}

//修改
public bool UpdateEntities(T entity)
{
db.Set<T>().Attach(entity);
db.Entry<T>(entity).State = EntityState.Modified;
return db.SaveChanges() > 0;
}

//修改
public bool DeleteEntities(T entity)
{
db.Set<T>().Attach(entity);
db.Entry<T>(entity).State = EntityState.Deleted;
return db.SaveChanges() > 0;
}

//查询
public IQueryable<T> LoadEntities(Func<T, bool> wherelambda)
{
return db.Set<T>().Where<T>(wherelambda).AsQueryable();
}

//分页
public IQueryable<T> LoadPagerEntities<S>(int pageSize, int pageIndex, out int total,
Func<T, bool> whereLambda, bool isAsc, Func<T, S> orderByLambda)
{
var tempData = db.Set<T>().Where<T>(whereLambda);

total = tempData.Count();

//排序获取当前页的数据
if (isAsc)
{
tempData = tempData.OrderBy<T, S>(orderByLambda).
Skip<T>(pageSize * (pageIndex - 1)).
Take<T>(pageSize).AsQueryable();
}
else
{
tempData = tempData.OrderByDescending<T, S>(orderByLambda).
Skip<T>(pageSize * (pageIndex - 1)).
Take<T>(pageSize).AsQueryable();
}
return tempData.AsQueryable();
}
}