C# 搜索时SQL查询出错

我有一个SQL查询，它显示数据库中不同表中的信息。这个查询然后显示在DataGrid中，我在DropDownList中有一些选项，可以在DataGrid中搜索特定的值。问题是搜索没有显示CollectName或DeliverName的正确信息。 下拉列表的代码：

 private static readonly Dictionary<string, string> SearchFields = new Dictionary<string, string> {
            { "Customer", "c.Name" },
            { "Department", "jn.Department" },
            { "CollectName", "SELECT Name FROM job_address WHERE AddressType = 3 AND JobID = jn.ID" },
            { "DeliverName", "(SELECT Name FROM job_address WHERE AddressType = 2 AND JobID = jn.ID)" }
        };

我有一个搜索功能，它获取从DropDownList中选择的值和在文本框中输入的值：

 List<MySqlParameter> param = new List<MySqlParameter>{ new MySqlParameter("compid", CompanyID) };
            StringBuilder SQL = new StringBuilder(SearchSQL);
            if (SearchFieldKey != null && SearchFieldKey.Length > 0)
            {
                SQL.Append(" AND (");
                for (int i = 0; i < SearchFieldKey.Length; i++)
                {
                    if (SearchFields.ContainsKey(SearchFieldKey[i]))
                    {

                        SQL.Append(SearchFields[SearchFieldKey[i]] + " LIKE ?parameter" + i.ToString());
                        param.Add(new MySqlParameter("parameter" + i.ToString(), "%" + SearchTerms[i] + "%"));

                        if (i != SearchFieldKey.Length - 1)
                            SQL.Append(" OR ");
                    }
                    else
                        throw new Exception("Error: Attempted to search on invalid field. Check SearchFields Argument.");
                }
                SQL.Append(") ");
            }

当我搜索CollectName或DeliverName时，查询如下：

WHERE c.Company_ID = ?compid AND (SELECT Name FROM job_address WHERE AddressType = 3 AND JobID = jn.ID LIKE ?parameter0)

---

此SQL查询是否存在导致CollectName和DeliverName无法工作的问题？

括号不匹配，应该是

WHERE c.Company_ID = ?compid 
AND (SELECT Name FROM job_address WHERE AddressType = 3 AND JobID = jn.ID) LIKE ?parameter0

要解决此问题，可以在词典中嵌入以下语句：

{ "CollectName", "(SELECT Name FROM job_address WHERE AddressType = 3 AND JobID = jn.ID)" },

或者在构建SQL的方法中，自动嵌入子查询：

SQL.Append("(" + SearchFields[SearchFieldKey[i]] + ") LIKE ?parameter" + i.ToString());

完全更正：如果使用StringBuilder，则不应尝试将字符串连接在一起：

var param = new List<MySqlParameter> { new MySqlParameter("compid", CompanyID) };
StringBuilder SQL = new StringBuilder(SearchSQL);
if (SearchFieldKey != null && SearchFieldKey.Length > 0)
{
    SQL.Append(" AND (");
    for (int i = 0; i < SearchFieldKey.Length; i++)
    {
        if (SearchFields.ContainsKey(SearchFieldKey[i]))
        {
            SQL.Append("(");
            SQL.Append(SearchFields[SearchFieldKey[i]]);
            SQL.Append(") LIKE ?parameter");
            SQL.Append(i);
            param.Add(new MySqlParameter("parameter" + i.ToString(), "%" + SearchTerms[i] + "%"));

            if (i != SearchFieldKey.Length - 1)
                SQL.Append(" OR ");
        }
        else
            throw new Exception("Error: Attempted to search on invalid field. Check SearchFields Argument.");
    }
    SQL.Append(") ");
}

---

对不起，括号不匹配是什么意思？我需要在我的代码中更改什么？从表中选择stuff，其中something=1，如params，该过滤器不是有效的查询

SQL.Append("(" + SearchFields[SearchFieldKey[i]] + ") LIKE ?parameter" + i.ToString());

var param = new List<MySqlParameter> { new MySqlParameter("compid", CompanyID) };
StringBuilder SQL = new StringBuilder(SearchSQL);
if (SearchFieldKey != null && SearchFieldKey.Length > 0)
{
    SQL.Append(" AND (");
    for (int i = 0; i < SearchFieldKey.Length; i++)
    {
        if (SearchFields.ContainsKey(SearchFieldKey[i]))
        {
            SQL.Append("(");
            SQL.Append(SearchFields[SearchFieldKey[i]]);
            SQL.Append(") LIKE ?parameter");
            SQL.Append(i);
            param.Add(new MySqlParameter("parameter" + i.ToString(), "%" + SearchTerms[i] + "%"));

            if (i != SearchFieldKey.Length - 1)
                SQL.Append(" OR ");
        }
        else
            throw new Exception("Error: Attempted to search on invalid field. Check SearchFields Argument.");
    }
    SQL.Append(") ");
}