15.怎样把键盘输入的‘+’符号变成‘A’?
textBox的KeyPress事件中
| if(e.KeyChar == '+') { SendKeys.Send("A"); e.Handled = true; } |
16.怎样使Winform启动时直接最大化?
| this.WindowState = FormWindowState.Maximized; |
17.c#怎样获取当前日期及时间,在sql语句里又是什么?
c#: DateTime.Now
sql server: GetDate()
18.怎样访问winform DataGrid的某一行某一列,或每一行每一列?
dataGrid[row,col]
19.怎样为DataTable进行汇总,比如DataTable的某列值‘延吉'的列为多少?
dt.Select("城市='延吉'").Length;
20.DataGrid数据导出到Excel后0212等会变成212。怎样使它导出后继续显示为0212?
range.NumberFormat = "0000";
21.
① 怎样把DataGrid的数据导出到Excel以供打印?
② 之前已经为DataGrid设置了TableStyle,即自定义了列标题和要显示的列,如果想以自定义的视图导出数据该怎么办?
③ 把数据导出到Excel后,怎样为它设置边框啊?
④ 怎样使从DataGrid导出到Excel的某个列居中对齐?
⑤ 数据从DataGrid导出到Excel后,怎样使标题行在打印时出现在每一页?
⑥ DataGrid数据导出到Excel后打印时每一页显示’当前页/共几页’,怎样实现?
①
| private void button1_Click(object sender, System.EventArgs e) { int row_index, col_index; row_index = 1; col_index = 1; Excel.ApplicationClass excel = new Excel.ApplicationClass(); excel.Workbooks.Add(true); DataTable dt = ds.Tables["table"]; foreach(DataColumn dcHeader in dt.Columns) excel.Cells[row_index, col_index++] = dcHeader.ColumnName; foreach(DataRow dr in dt.Rows) { col_index = 0; foreach(DataColumn dc in dt.Columns) { excel.Cells[row_index+1, col_index+1] = dr[dc]; col_index++; } row_index++; } excel.Visible = true; } private void Form1_Load(object sender, System.EventArgs e) { SqlConnection conn = new SqlConnection("server=tao; uid=sa; pwd=; database=pubs"); conn.Open(); SqlDataAdapter da = new SqlDataAdapter("select * from authors", conn); ds = new DataSet(); da.Fill(ds, "table"); dataGrid1.DataSource = ds; dataGrid1.DataMember = "table"; } |
②dataGrid1.TableStyles[0].GridColumnStyles[index].HeaderText; //index可以从0~dataGrid1.TableStyles[0].GridColumnStyles.Count遍历。
③ Excel.Range range;
range=worksheet.get_Range(worksheet.Cells[1,1],xSt.Cells[ds.Tables[0].Rows.Count+1,ds.Tables[0].Columns.Count]);
range.BorderAround(Excel.XlLineStyle.xlContinuous,Excel.XlBorderWeight.xlThin,Excel.XlColorIndex.xlColorIndexAutomatic,null);
range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Excel.XlColorIndex.xlColorIndexAutomatic;
range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].LineStyle =Excel.XlLineStyle.xlContinuous;
range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].Weight =Excel.XlBorderWeight.xlThin;
range.Borders[Excel.XlBordersIndex.xlInsideVertical].ColorIndex =Excel.XlColorIndex.xlColorIndexAutomatic;
range.Borders[Excel.XlBordersIndex.xlInsideVertical].LineStyle = Excel.XlLineStyle.xlContinuous;
range.Borders[Excel.XlBordersIndex.xlInsideVertical].Weight = Excel.XlBorderWeight.xlThin;
④ range.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter
⑤ worksheet.PageSetup.PrintTitleRows = "$1:$1";
⑥ worksheet.PageSetup.CenterFooter = "第&P页 / 共&N页";

