comboBox绑定数据库后SelectedIndexChanged事件出错

来源：互联网发布：linux 清空history 编辑：程序博客网时间：2024/04/28 03:15

comBox控件绑定数据库字段后，在窗体的Load事件之前就已经触发SelectedIndexChanged了，这时可以加一个标识，让其在Load事件之后激发。

bool flag;        private void Education_Training_Load(object sender, EventArgs e)        {             MyDBase DB = new MyDBase(DBUser.sserver, DBUser.DBName, DBUser.suser, DBUser.spasswd);                     DataSet  DS = DB.GetRecordset("select distinct (year(date)) as date from education_train where PID=1");            comboBox_Year.DataSource = DS.Tables[0];            comboBox_Year.DisplayMember = "date";            comboBox_Year.ValueMember = "date";            flag = true;            DB.DBClose();        }        private void comboBox_Year_SelectedIndexChanged(object sender, EventArgs e)        {            if (!flag) return;            MyDBase DB = new MyDBase(DBUser.sserver, DBUser.DBName, DBUser.suser, DBUser.spasswd);            int d1 = int.Parse(comboBox_Year.Text);            int d2 = d1 + 1;            DataSet DS = DB.GetRecordset("SELECT * FROM VIEW_EDUCATION_TRAIN where  培训时间 between '" + d1 + "' and '" + d2 + "' ");            if (DB.ErrorCode())            {                MessageBox.Show(DB.ErrMessage(), "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);                return;            }            dataGridView2.DataSource = DS.Tables[0];            DB.DBClose();        }

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