comboBox绑定数据库后SelectedIndexChanged事件出错
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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