linq-to-sql – 编译的查询和“参数不能是序列”

我认为编译的查询将执行与DataContext相同的查询转换.但是当我尝试使用带有.Contains方法调用的查询时,我遇到了运行时错误.我哪里出错了？

//private member which holds a compiled query.
Func<DataAccess.DataClasses1DataContext,List<int>,List<DataAccess.TestRecord>>
  compiledFiftyRecordQuery = System.Data.Linq.CompiledQuery.Compile
  <DataAccess.DataClasses1DataContext,List<DataAccess.TestRecord>>
  ((dc,ids) => dc.TestRecords.Where(tr => ids.Contains(tr.ID)).ToList());

//this method calls the compiled query.
public void FiftyRecordCompiledQueryByID()
{
  List<int> IDs = GetRandomInts(50);

  //System.NotSupportedException
  //{"Parameters cannot be sequences."}

  List<DataAccess.TestRecord> results = compiledFiftyRecordQuery
    (myContext,IDs);         
}

解决方法

This article有你的答案：

Queries with list parameters cannot be precompiled because the translation of the query is dependent on the number of items in the list.

原文地址：https://www.jb51.cc/mssql/76974.html