Beispiel #1
0
        /// <summary>
        /// 异步使用附带新值的实体更新指定实体属性的值,此方法不支持事务
        /// </summary>
        /// <param name="propertyExpresion">属性表达式,提供要更新的实体属性</param>
        /// <param name="entities">附带新值的实体属性,必须包含主键</param>
        /// <returns>操作影响的行数</returns>
        /// <exception cref="System.NotSupportedException"></exception>
        public async Task <int> UpdateAsync(Expression <Func <TEntity, object> > propertyExpresion, params TEntity[] entities)
        {
            propertyExpresion.CheckNotNull("propertyExpresion");
            entities.CheckNotNull("entities");
            CodeFirstDbContext context = new CodeFirstDbContext();

            context.Update <TEntity, TKey>(propertyExpresion, entities);
            bool fail;

            try
            {
                return(await context.SaveChangesAsync(false));
            }
            catch (DbUpdateConcurrencyException)
            {
                fail = true;
            }
            if (fail)
            {
                TKey[] ids = entities.Select(m => m.Id).ToArray();
                context.Set <TEntity>().Where(m => ids.Contains(m.Id)).Load();
                context.Update <TEntity, TKey>(propertyExpresion, entities);
                return(await context.SaveChangesAsync(false));
            }
            return(0);
        }
Beispiel #2
0
        /// <summary>
        /// 使用附带新值的实体更新指定实体属性的值,此方法不支持事务
        /// </summary>
        /// <param name="propertyExpresion">属性表达式,提供要更新的实体属性</param>
        /// <param name="entities">附带新值的实体属性,必须包含主键</param>
        /// <returns>操作影响的行数</returns>
        /// <exception cref="System.NotSupportedException"></exception>
        public int Update(Expression <Func <TEntity, object> > propertyExpresion, params TEntity[] entities)
        {
            propertyExpresion.CheckNotNull("propertyExpresion");
            entities.CheckNotNull("entities");
            CodeFirstDbContext context = new CodeFirstDbContext();

            context.Update <TEntity, TKey>(propertyExpresion, entities);
            try
            {
                return(context.SaveChanges(false));
            }
            catch (DbUpdateConcurrencyException)
            {
                TKey[] ids = entities.Select(m => m.Id).ToArray();
                context.Set <TEntity>().Where(m => ids.Contains(m.Id)).Load();
                context.Update <TEntity, TKey>(propertyExpresion, entities);
                return(context.SaveChanges(false));
            }
        }