private void BtnQuery_Click_1(object sender, RoutedEventArgs e) { //非空判断 if (txtClassNum.Text == null || txtClassName.Text == null) { MessageBox.Show("请输入查询条件"); } else if (txtClassNum.Text != "" && txtClassName.Text == "") { string Num = txtClassNum.Text; DataTable data = ser.showClassInfo1(Num); data.Columns[0].ColumnName = "课堂号"; data.Columns[1].ColumnName = "课堂名"; data.Columns[2].ColumnName = "教师编号"; datagridShowInfo.ItemsSource = data.DefaultView; } else if (txtClassNum.Text == "" && txtClassName.Text != "") { string Name = txtClassName.Text; DataTable data = ser.showClassInfo2(Name); data.Columns[0].ColumnName = "课堂号"; data.Columns[1].ColumnName = "课堂名"; data.Columns[2].ColumnName = "教师编号"; datagridShowInfo.ItemsSource = data.DefaultView; } else if (txtClassNum.Text != "" && txtClassName.Text != "") { string Num = txtClassNum.Text; string Name = txtClassName.Text; DataTable data = ser.showClassInfo3(Num, Name); data.Columns[0].ColumnName = "课堂号"; data.Columns[1].ColumnName = "课堂名"; data.Columns[2].ColumnName = "教师编号"; datagridShowInfo.ItemsSource = data.DefaultView; } }