Question

我创建了这个通用方法：

/// <summary>
/// Executes a list of items
/// </summary>
/// <param name="procedureName">The name of the procedure</param>
/// <param name="parameters">List of oracle parameters</param>
/// <param name="limit">The limit of the results to return</param>
/// <param name="mapper">The oracle mapper method</param>
/// <returns></returns>
protected async Task<IEnumerable<T>> ListAsync<T>(string procedureName, IList<OracleParameter> parameters, int limit, Func<IDataReader, T> mapper)
{
    // Create our list
    var models = new List<T>();
    var counter = 0;

    // Get our reader and return our model
    using (var reader = await _oracleUnitOfWork.ExecuteReaderAsync(procedureName, parameters))
    {
        // While we have rows and our counter 
        while (reader.Read() && ((counter < limit || limit == 0) || limit == 0))
        {
            // If we have a limit, increase our counter (this is first to stop 0 based index messing the amount of objects to return)
            if (limit > 0)
                counter++;

            // Get our item from the database
            models.Add(mapper(reader));
        }
    }

    // Return our list
    return models;
}

我可以这样调用：

return await ListAsync("IBPA_MANFCOMPLAINT.complaintSearch", parameters, yield, OracleMapper.Complaint.Map);

但我想稍微延伸一下。 Mapper只使用 IDataReader 将列值分配给模型属性。对于股票而不是使用它：

return await ListAsync("ibpa_stock.readRelatedLotstoLot", parameters, 0, OracleMapper.Stock.Map);

我想做一个get请求，有点像这样：

return await ListAsync("ibpa_stock.readRelatedLotstoLot", parameters, 0, async (reader) => await GetAsync(reader["lotno"].ToString()));

我可以做些什么来保持干燥，但同时允许这种调用？

Answer 1

您需要对方法进行两次重载，一次接受Func<IDataReader, T>，另一次接受Func<IDataReader, Task<T>>。第二个在调用方法时需要await方法调用，前者不会。

c＃异步委托

1 个答案: