C# SqlParameter异常：SqlParameter已包含在另一个SqlParameterCollection中

我有个例外

SqlParameter已包含在另一个SqlParameterCollection中

我已经将我的

SqlParameter

调用移出了foreach循环，因为我认为这是问题所在，但我仍然得到了相同的异常

private void SendToSQLServer_FactionStandings(Faction faction)
{
    string sqlCnnString = "Server=tcp:horde.database.windows.net,1433;Initial Catalog=horde_db;Persist Security Info=False;User ID=USERNAME@horde;Password=PASSWORD;MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;";

    SqlParameter sqlParaFaction_Faction_ID = new SqlParameter("@Faction_ID", SqlDbType.Int);
    SqlParameter sqlParaFaction_ToFactionID = new SqlParameter("@ToFaction_ID", SqlDbType.Int);
    SqlParameter sqlParaFaction_Standing = new SqlParameter("@Standing", SqlDbType.SmallInt);

    using (SqlConnection sqlCnn = new SqlConnection(sqlCnnString))
    {
        sqlCnn.Open();

        using (SqlTransaction sqlTrans = sqlCnn.BeginTransaction())
        {
            using (SqlCommand sqlCmd = new SqlCommand())
            {
                sqlCmd.Parameters.Clear();

                foreach (FactionStanding factionStanding in faction.FactionStandings)
                {
                    //
                    // - Insert Faction Standing Table Data
                    //

                    sqlParaFaction_Faction_ID.Value = factionStanding.Faction_ID; 
                    sqlCmd.Parameters.Add(sqlParaFaction_Faction_ID); // <---- Getting exception here

                    sqlParaFaction_ToFactionID.Value = factionStanding.ToFaction_ID;
                    sqlCmd.Parameters.Add(sqlParaFaction_ToFactionID);

                    sqlParaFaction_Standing.Value = factionStanding.DefaultStanding;
                    sqlCmd.Parameters.Add(sqlParaFaction_Standing);

                    string sqlCmdFactionStandings = "INSERT INTO FactionStandings (Faction_ID, ToFaction_ID, Standing) VALUES (@Faction_ID, @ToFaction_ID, @Standing)";

                    sqlCmd.Connection = sqlCnn;
                    sqlCmd.CommandText = sqlCmdFactionStandings;
                    sqlCmd.Transaction = sqlTrans;

                    sqlCmd.ExecuteNonQuery();
                }

                sqlTrans.Commit();
                sqlCmd.Parameters.Clear();
            }
        }
    }
}

private void SendToSQLServer\u派系排名（派系）
{
string sqlCnnString=“Server=tcp:horde.database.windows.net，1433；初始目录=horde\u db；持久安全信息=False；用户ID=USERNAME@horde；Password=Password；MultipleActiveResultSets=False；Encrypt=True；TrustServerCertificate=False；连接超时=30；“；
SqlParameter sqlparaction\u-partion\u-ID=新的SqlParameter（“@partion\u-ID”，SqlDbType.Int）；
SqlParameter sqlparaction\u ToFaction ID=新的SqlParameter（“@ToFaction\u ID”，SqlDbType.Int）；
SqlParameter sqlparaction_Standing=新的SqlParameter（“@Standing”，SqlDbType.SmallInt）；
使用（SqlConnection sqlCnn=newsqlconnection（sqlCnnString））
{
sqlCnn.Open（）；
使用（SqlTransaction sqlTrans=sqlCnn.BeginTransaction（））
{
使用（SqlCommand sqlCmd=new SqlCommand（））
{
sqlCmd.Parameters.Clear（）；
foreach（派系立场派系立场派系立场）
{
//
//-插入表格数据
//
SQLPARAPROTIONE\u PROTIONE\u ID.Value=PARTIONSTANDING.PROTIONE\u ID；
sqlCmd.Parameters.Add（sqlparaction\u-partition\u-ID）；//您将同一个SqlParameter多次添加到同一个SqlCommand中。问题是
Parameters.Clear（）
从命令中删除参数，但参数仍然认为命令“拥有”这些参数。无法删除此所有权。这是不直观的，也是常见的错误：）

解决此问题的两种方法：

为每个循环迭代创建新的SqlParameter对象
或者使用一个SqlCommand（就像你所拥有的）并将
sqlCmd.Parameters添加到循环之外

    SqlParameter sqlParaFaction_Faction_ID = new SqlParameter("@Faction_ID", SqlDbType.Int);
    SqlParameter sqlParaFaction_ToFactionID = new SqlParameter("@ToFaction_ID", SqlDbType.Int);
    SqlParameter sqlParaFaction_Standing = new SqlParameter("@Standing", SqlDbType.SmallInt);

    using (SqlConnection sqlCnn = new SqlConnection(sqlCnnString))
    {
        sqlCnn.Open();
        using (SqlTransaction sqlTrans = sqlCnn.BeginTransaction())
        {
            using (SqlCommand sqlCmd = new SqlCommand())
            {
                sqlCmd.Connection = sqlCnn;
                string sqlCmdFactionStandings = "INSERT INTO FactionStandings (Faction_ID, ToFaction_ID, Standing) VALUES (@Faction_ID, @ToFaction_ID, @Standing)";
                sqlCmd.CommandText = sqlCmdFactionStandings;
                sqlCmd.Transaction = sqlTrans;
                sqlCmd.Parameters.Add(sqlParaFaction_Faction_ID);
                sqlCmd.Parameters.Add(sqlParaFaction_ToFactionID);
                sqlCmd.Parameters.Add(sqlParaFaction_Standing);

                foreach (FactionStanding factionStanding in faction.FactionStandings)
                {
                    //
                    // - Insert Faction Standing Table Data
                    //
                    sqlParaFaction_Faction_ID.Value = factionStanding.Faction_ID; 
                    sqlParaFaction_ToFactionID.Value = factionStanding.ToFaction_ID;
                    sqlParaFaction_Standing.Value = factionStanding.DefaultStanding;

                    sqlCmd.ExecuteNonQuery();
                }

                sqlTrans.Commit();
            }
        }
    }
}


我添加了两行以在参数被使用后清除参数，希望它们不会被using语句处理。同样的问题。更新了代码和行号。请查看帮助文章，还有。谢谢！我不敢相信我忽略了这一点。我不会再犯那个错误了！