[英]my DataGridView is blank after setting DataSource for it
我有一个将DataGridView作为参数并将其数据导出到excel的函数:
public Worksheet exportToExcel(DataGridView dgv)
我想对DataTable进行相同的操作,因此我编写了以下函数:
public Worksheet exportToExcel(System.Data.DataTable dataTable)
{
DataGridView dgv = new DataGridView();
dgv.DataSource = dataTable;
return exportToExcel(dgv);
}
但是当我运行第二个函数时, DataGridView没有任何列和行。 我确定我的DataTable有数据,并且当我在窗体上显示DataGridView时,一切正常。
这是我的exportToExcel函数:
public Worksheet exportToExcel(DataGridView dgv)
{
//create excel application
Microsoft.Office.Interop.Excel.Application excelApplication = new ApplicationClass();
excelApplication.Visible = false;
//open excel template file
object template = AppDomain.CurrentDomain.BaseDirectory + "Reports/Excel/General.xltx";
Workbook excelWorkbook = excelApplication.Workbooks.Add(template);
Worksheet excelWorksheet = (Worksheet)excelWorkbook.Worksheets.get_Item("Sheet1");
//exporting column headers
for (int i = 0; i < dgv.Columns.Count; i++)
{
excelWorksheet.Cells[1, i + 1] = dgv.Columns[i].HeaderText;
}
//exporting data
for (int i = 0; i < dgv.Rows.Count; i++)
{
for (int j = 0; j < dgv.Columns.Count; j++)
{
excelWorksheet.Cells[i + 2, j + 1] = dgv.Rows[i].Cells[j].Value;
}
}
//draw border for each cell
Range range = excelWorksheet.get_Range("A1", excelWorksheet.Cells[dgv.Rows.Count + 1, dgv.Columns.Count]);
range.Borders[XlBordersIndex.xlInsideHorizontal].LineStyle = XlLineStyle.xlContinuous;
range.Borders[XlBordersIndex.xlInsideVertical].LineStyle = XlLineStyle.xlContinuous;
range.BorderAround(Type.Missing, XlBorderWeight.xlThick, XlColorIndex.xlColorIndexAutomatic, Type.Missing);
//resize columns automatically based on their data
excelWorksheet.Columns.AutoFit();
//show excel application
excelApplication.Visible = true;
return excelWorksheet;
}
“当我在表单上显示DataGridView时,一切正常”
为了读取(迭代)datagridview的行/列,需要将其添加到控件(Form / UserControl)。 我认为也需要绘制它,但事实并非如此。 这意味着您可以在调用exportToExcel之前将DataGridView添加到新表单,然后处理该表单和DataGridView。
public Worksheet exportToExcel(System.Data.DataTable dataTable)
{
//Wrap in using statements to make sure controls are disposed
using (Form frm = new Form())
{
using(DataGridView dgv = new DataGridView())
{
//Add dgv to form before setting datasource
frm.Controls.Add(dgv);
dgv.DataSource = dataTable;
return exportToExcel(dgv);
}
}
}
这应该可行,但是我想指出,这不是我建议的解决方案。 我将创建一个采用DataTable作为参数的exportToExcel方法。
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