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  • EF-按字段读取

    
            /// <summary>
            /// 直接获取特定一个或者多个字段的值
            /// 多个字段需要声明Model
            /// var s=  testDal.GetScalar<dynamic>(m=>m.Code== "02018",m=>new { m.Name,m.Code });
            /// var a = s.Name;
            /// </summary>
            /// <typeparam name="T"></typeparam>
            /// <param name="predicate"></param>
            /// <param name="scalar"></param>
            /// <returns></returns>
            public T GetScalar<T>(Expression<Func<TEntity, bool>> predicate, Expression<Func<TEntity, T>> scalar)
            {
                if (predicate == null)
                {
                    return dbcontext.Set<TEntity>().AsNoTracking().Select(scalar).FirstOrDefault();
                }
                else
                {
                    return dbcontext.Set<TEntity>().AsNoTracking().Where(predicate).Select(scalar).FirstOrDefault();
                }
    
            }
    
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  • 原文地址:https://www.cnblogs.com/chenmfly/p/6363809.html
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