Question

我正在尝试使用LINQ查询表缓存：

public static IEnumerable<DocumentMetaDataEntity> Get(string connectionString, string cacheName, DeconstructedFileName deconstructedFileName, FileMetaDataFilters filters)
{
    var acc = CloudStorageAccount.Parse(connectionString);
    var tableClient = acc.CreateCloudTableClient();
    var table = tableClient.GetTableReference(cacheName);
    var translations = from entity in table.CreateQuery<DocumentMetaDataEntity>()
                       where (entity.sourceParty == sourceParty.ToLowerTrim()
                                   && entity.destinationParty == destinationParty.ToLowerTrim())
                             || (entity.sourceParty == "YES"
                                   && entity.destinationParty == destinationParty.ToLowerTrim())
                       select entity;

    return translations.Where(x => x.expireAt > DateTime.Now)
                       .Where(x => x.effectiveAt < DateTime.Now);
}

但是，遇到此异常：

'CloudTable'不包含'CreateQuery'的定义，找不到可以接受的扩展方法'CreateQuery'接受类型为'CloudTable'的第一个参数（您是否缺少using指令或程序集引用？）

我在做什么错？是否无法从.net核心查询表缓存？

有关一些附加信息，以下是此类中可用的 create 方法：

这里是所有依赖项：

我从等式中删除了LINQ，但仍然遇到以下问题：

完整信息如下：

public static IEnumerable<DocumentMetaDataEntity> Get(string connectionString, string cacheName, DeconstructedFileName deconstructedFileName, FileMetaDataFilters filters)
{
    var acc = CloudStorageAccount.Parse(connectionString);
    var tableClient = acc.CreateCloudTableClient();
    var table = tableClient.GetTableReference(cacheName);
    var query = new TableQuery<DocumentMetaDataEntity>().Where
        (TableQuery.CombineFilters
            (TableQuery.GenerateFilterCondition("FacilityCode", QueryComparisons.Equal, deconstructedFileName.FacilityCode)
               , TableOperators.And
               , TableQuery.GenerateFilterCondition("LastName", QueryComparisons.LessThan, deconstructedFileName.LastName)
            )
        );            

    var entities = table.ExecuteQuery(query).ToList();
}

Answer 1

据我所知，.net核心目前不支持使用Linq进行查询。但我知道您可以做到

var table = acc.GetTableReference("TableName");

var partitionKey = "PartitionKey";

TableQuery<TableModel> rangeQuery = new TableQuery<TableModel>()
      .Where(TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, partitionKey.ToString()));

var entities = table.ExecuteQuery(rangeQuery).ToList();

编辑：GitHub issue

编辑2：ExecuteQuery扩展方法

public static IEnumerable<T> ExecuteQuery<T>(this CloudTable table, TableQuery<T> query) where T : ITableEntity, new()
    {
        List<T> result = new List<T>();

        TableContinuationToken continuationToken = null;
        do
        {
            // Retrieve a segment (up to 1,000 entities).
            TableQuerySegment<T> tableQueryResult = table.ExecuteQuerySegmentedAsync(query, continuationToken).Result;

            result.AddRange(tableQueryResult.Results);

            continuationToken = tableQueryResult.ContinuationToken;
        } while (continuationToken != null);

        return result;
    }

是否可以从.net核心查询表存储？

1 个答案: