我试图在使用带有延续令牌的分页时从 Azure 表存储中获取一些记录。
我有以下代码:
public Stories SelectStory(DateTime start, DateTime end, string searchGuid)
{
long startTicks = DateTime.MaxValue.Ticks - start.ToUniversalTime().Ticks;
long endTicks = DateTime.MaxValue.Ticks - end.ToUniversalTime().Ticks;
var stories = _ServiceContext.CreateQuery<Story>("Story").Where(s => Convert.ToInt64(s.RowKey.Substring(0, s.PartitionKey.IndexOf("_"))) > startTicks
&& Convert.ToInt64(s.RowKey.Substring(0, s.PartitionKey.IndexOf("_"))) < endTicks
&& s.RowKey == "story_" + searchGuid).Take(50);
var query = stories as DataServiceQuery<Story>;
var results = query.Execute();
var response = results as QueryOperationResponse;
Stories temp = new Stories();
if(response.Headers.ContainsKey("x-ms-continuation-NextRowKey"))
{
temp.NextPartitionKey = response.Headers["x-ms-continuation-NextPartitionKey"];
if (response.Headers.ContainsKey("x-ms-continuation-NextRowKey"))
{
temp.NextRowKey = response.Headers["x-ms-continuation-NextRowKey"];
}
}
temp.List = results.ToList();
return temp;
}
但我收到以下错误:
The expression (((ToInt64([10007].RowKey.Substring(0, [10007].PartitionKey.IndexOf("_"))) > 2521167043199999999) And (ToInt64([10007].RowKey.Substring(0, [10007].PartitionKey.IndexOf("_"))) < 2521154083199999999)) And ([10007].RowKey == "story_9")) is not supported.
我不确定为什么不允许表达。有谁知道如何改变它以使其正常工作?
谢谢!
编辑:新代码(没有错误,但没有选择数据 - 即使我知道它存在):
public Stories SelectStory(DateTime start, DateTime end, string searchGuid)
{
long startTicks = DateTime.MaxValue.Ticks - start.ToUniversalTime().Ticks;
long endTicks = DateTime.MaxValue.Ticks - end.ToUniversalTime().Ticks;
var strStart = string.Format("{0:10}_{1}", DateTime.MaxValue.Ticks - startTicks, "00000000-0000-0000-0000-000000000000");
var strEnd = string.Format("{0:10}_{1}", DateTime.MaxValue.Ticks - endTicks, "00000000-0000-0000-0000-000000000000");
var stories = _ServiceContext.CreateQuery<Story>("Story").Where(
s => s.RowKey.CompareTo(strStart) < 0
&& s.RowKey.CompareTo(strEnd) > 0
//s.RowKey.CompareTo(startTicks.ToString() + "_") > 0
//&& s.RowKey.CompareTo(endTicks.ToString() + "_00000000-0000-0000-0000-000000000000") > 0
&& s.PartitionKey == ("story_" + searchGuid)
).Take(50);
var query = stories as DataServiceQuery<Story>;
var results = query.Execute();
var response = results as QueryOperationResponse;
Stories temp = new Stories();
if(response.Headers.ContainsKey("x-ms-continuation-NextRowKey"))
{
temp.NextPartitionKey = response.Headers["x-ms-continuation-NextPartitionKey"];
if (response.Headers.ContainsKey("x-ms-continuation-NextRowKey"))
{
temp.NextRowKey = response.Headers["x-ms-continuation-NextRowKey"];
}
}
temp.List = results.ToList();
return temp;
}