Question

我有一个函数，它将 DataGridView 作为参数并将其数据导出到excel中：

public Worksheet exportToExcel(DataGridView dgv)

我想对 DataTable 执行相同的操作，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，当我在表单上显示 DataGridView 时，一切正常。

这是我的 exportToExcel 功能：

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;
}

Answer 1

＆＃34;当我在表单上显示DataGridView时，一切正常＆＃34;

为了读取（迭代）datagridview的行/列，需要将其添加到控件（Form / UserControl）中。我认为它也需要被绘制，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，然后调用Form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);
        }
    }   
}

这应该有用，但我想指出这不是我建议的解决方案。我会创建一个exportToExcel方法将DataTable作为参数。

为我设置DataSource后，我的DataGridView为空白

1 个答案: