[英]List serialization in CLR aggregation function C#
我正在嘗試通過C#將聚合函數添加到SQL Server 2005中。 但是當我部署項目時,它失敗並顯示以下錯誤:
.Net SqlClient數據提供程序:消息6222,級別16,狀態1,行1類型“ AggregationTest.CountNonintersectingIntervals”類型已標記為本機序列化,但類型為“ AggregationTest.CountNonintersectingIntervals”的字段“ intervals”不適用於本機序列化
這是我正在使用的代碼:
[Serializable]
[Microsoft.SqlServer.Server.SqlUserDefinedType(Format.Native)]
public struct Interval : INullable
{
public Interval(int beginning, int ending) : this()
{
this.beginning = beginning;
this.ending = ending;
}
public override string ToString()
{
return "(" + beginning + ", " + ending + ")";
}
public bool IsNull { get { return m_Null; } }
public static Interval Null { get { /*Some code*/ } }
public static Interval Parse(SqlString s)
{
/*Some code*/
}
public int beginning;
public int ending;
private bool m_Null;
}
[Serializable]
[Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.Native)]
public struct CountNonintersectingIntervals
{
public void Init()
{
intervals = new List<Interval>();
}
public void Accumulate(Interval interval)
{
intervals.Add(interval);
}
public void Merge(CountNonintersectingIntervals Group)
{
intervals.AddRange(Group.intervals);
}
public SqlInt32 Terminate()
{
// Some complicated calculation using intervals
}
private List<Interval> intervals;
}
你能幫我解決問題嗎
您必須將SqlUserDefinedAggregate
屬性初始化為Format.UserDefined
並實現IBinarySerialize
接口,以照顧intervals
實例。
本機序列化僅對可填充類型有效( List<Interval>
無效)。
http://social.msdn.microsoft.com/forums/en-us/sqlnetfx/thread/D4A58ABA-4C95-4232-AF6E-270892BE45C5
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