Reader.IsConsumed是假的，但对象被处理掉了

我正在使用QueryMultiple返回一个GridReader 。

因为我不知道我要读多少数据，所以我用IsConsumed的停止条件循环读取器：

using (var reader = conn.QueryMultiple(mySql)) {
  while(!reader.IsConsumed) {
    reader.Read<...>
  }
}

但是，我总是在最后一次读取时收到ObjectDisposedException 。 IsConsumed的值仍然是false 。

我试图将DynamicParameters传递给查询，目的是获得一个回调（这似乎是通过IParameterCallbacks有用），但我无法将它一起修补。

我真的不想在代码中有这样一个预期的异常。谢谢你的帮助。

我使用的是SQL Server，我的提供程序是.NET 4.5中的System.Data.SqlClient ，Dapper版本1.40.0.0

一个失败的测试例如：

        [TestMethod]
        public void QueryMultipleWithCursor()
        {

            const string sql = @"
DECLARE @CurrentDate DATE
DECLARE DatesCursor CURSOR LOCAL FOR
    SELECT DISTINCT DataDate FROM Data_Table ORDER BY DataDate 
OPEN DatesCursor
FETCH NEXT FROM DatesCursor INTO @CurrentDate

WHILE @@FETCH_STATUS = 0 BEGIN

    SELECT DISTINCT
        DataDate AS Date1,
        DataDate AS Date2
        FROM Data_Table
        WHERE DataDate=@CurrentDate

    FETCH NEXT FROM DatesCursor INTO @CurrentDate
END
CLOSE DatesCursor
DEALLOCATE DatesCursor";

            using (var conn = _database.GetConnection())
            {
                    var reader = conn.QueryMultiple(sql);
                    while (!reader.IsConsumed)
                    {
                            reader.Read<DateTime, DateTime, DateTime>(
                                (date1, date2) => date1,
                                splitOn: "Date2").ToList();
                    }
            }
        }

我正在使用以下堆栈获取NullReferenceException ：

at Dapper.SqlMapper.GridReader.NextResult() in D:\Dev\dapper-dot-net\Dapper NET40\SqlMapper.cs:line 4440
   at Dapper.SqlMapper.GridReader.<MultiReadInternal>d__9`8.System.IDisposable.Dispose()
   at Dapper.SqlMapper.GridReader.<MultiReadInternal>d__9`8.MoveNext() in D:\Dev\dapper-dot-net\Dapper NET40\SqlMapper.cs:line 4309
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Dapper.SqlMapper.GridReader.Read[TFirst,TSecond,TReturn](Func`3 func, String splitOn, Boolean buffered) in D:\Dev\dapper-dot-net\Dapper NET40\SqlMapper.cs:line 4330
   at Project.MyTests.QueryMultipleWithCursor() in C:\Project\MyTests.cs:line 171
Result Message: 
Test method Project.MyTests.QueryMultipleWithCursor threw exception: 
System.NullReferenceException: Object reference not set to an instance of an object.