/// <summary> /// 课程变化 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void cmbLesson_SelectedIndexChanged(object sender, EventArgs e) { if (cmbLesson.Text != "") { string lessonId = ((DataTable)(cmbLesson.DataSource)).Rows[cmbLesson.SelectedIndex]["LessonId"].ToString(); DataSet ds_content = new DataSet(); if (db.GetContent(0, 0, "*", "LessonId=" + lessonId, "", ref ds_content)) { dataGridView1.DataSource = ds_content.Tables[0]; } } else { dataGridView1.DataSource = null; } }