sql返回值出错??

Question

 public int GetObjectCountByTime(DateTime timeStart, DateTime timeEnd)
    {
        StringBuilder strsql = new StringBuilder("select count(Obj_id) from [dbo].[C_Work_Object]");
        if (timeStart != DateTime.MinValue || timeEnd != DateTime.MinValue)
        {
            strsql.Append(" where  ");
            if (timeStart == DateTime.MinValue)
            {
                strsql.AppendFormat("Obj_dotime< '{0}'", timeEnd.ToString());
            }
            else if (timeEnd == DateTime.MinValue)
            {
                strsql.AppendFormat("Obj_dotime> '{0}'", timeStart.ToString());
            }
            else
            {
                strsql.AppendFormat("Obj_dotime between '{0}' and '{1}'", timeStart.ToString(), timeEnd.ToString());
            }
        }
        return this.dbProcessor.ExecuteInsert(strsql);    }出现无法从System.text.StringBuilder转换为 "string"怎么改正啊??哪位指点一下啊,谢谢~~

Answer 1

return this.dbProcessor.ExecuteInsert(strsql.TOSTRING());

Answer 2

return this.dbProcessor.ExecuteInsert(strsql.TOSTRING());

Answer 3

return this.dbProcessor.ExecuteInsert(strsql.ToString());