如何将c#datagridview导出到Excel

Question

在我的应用程序中，需要将 datagridview 导出到 Excel 中。

我正在使用以下源代码。我想就以下问题寻求专家建议。

1. 我的代码是否正确？因为我没有在所选路径中保存任何文件。

2. 从网格导出数据时是否存在任何性能问题，因为网格中可能有尽可能多的可用数据？

3. 我正在使用命名空间“Microsoft.Office.Interop.Excel”，不确定是否正确？

  private void btnSaveResult_Click(object sender, EventArgs e)
        {
            try
            {
                if (this.saveFileDialog.ShowDialog() == DialogResult.OK)
                {
                    saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
                    saveFileDialog.FilterIndex = 0;
                    saveFileDialog.RestoreDirectory = true;
                    saveFileDialog.CreatePrompt = true;
                    saveFileDialog.Title = "Export Excel File To";
                    Microsoft.Office.Interop.Excel.ApplicationClass ExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
                    ExcelApp.Application.Workbooks.Add(Type.Missing);
                    ExcelApp.Columns.ColumnWidth = 30;
                    for (int i = 0; i < grdResult.Rows.Count; i++)
                    {
                        DataGridViewRow row = grdResult.Rows[i];
                        for (int j = 0; j < row.Cells.Count; j++)
                        {
                            ExcelApp.Cells[i + 1, j + 1] = row.Cells[j].ToString();
                        }
                    }                    
                    ExcelApp.ActiveWorkbook.Saved = true;
                    ExcelApp.Quit();
                    MessageBox.Show("The Save button was clicked or the Enter key was pressed" + "\nThe file would have been saved as " + this.saveFileDialog.FileName);

                }
                else MessageBox.Show("The Cancel button was clicked or Esc was pressed");

            }
            catch (Exception ex)
            {
                MessageBox.Show("Cancelled Save Operation");
                this.Close();
            }


        }

Answer 1

在添加时获取工作簿的句柄，并调用 Workbook.SaveCopyAs(filePath);

Answer 2

尝试关注课程

    using System;
    using System.Data;
    using System.Configuration;
    using System.IO;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;

    /// <summary>
    /// Summary description for GridViewExportUtil
    /// </summary>
    public class GridViewExportUtil
    {
public GridViewExportUtil()
{
    //
    // TODO: Add constructor logic here
    //
}
    public static void ExportGridView(string fileName, GridView gv, Label header, Label date)
        {
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", fileName));
            HttpContext.Current.Response.ContentType = "application/ms-excel";

            using (StringWriter sw = new StringWriter())
            {
                using (HtmlTextWriter htw = new HtmlTextWriter(sw))
                {
                    gv.AllowPaging = false;
                    //  Create a table to contain the grid
                    Table table = new Table();

                    //  include the gridline settings
                    table.GridLines = gv.GridLines;

                    gv.Style["font-family"] = "Tahoma";
                    //  add the header row to the table

                    if (gv.HeaderRow != null)
                    {
                        GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                        gv.HeaderRow.BackColor = System.Drawing.Color.Lavender;
                        gv.HeaderRow.ForeColor = System.Drawing.Color.Green;

                        table.Rows.Add(gv.HeaderRow);
                    }
                    //  add each of the data rows to the table
                    foreach (GridViewRow row in gv.Rows)
                    {
                        GridViewExportUtil.PrepareControlForExport(row);
                        table.Rows.Add(row);
                    }
                    //  add the footer row to the table
                    if (gv.FooterRow != null)
                    {
                        GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
                        table.Rows.Add(gv.FooterRow);
                    }
                    htw.WriteLine("<br>");
                    // htw.WriteLine("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;");
                    if (header.Text != null)
                    {
                        header.Font.Size = 15;
                        header.Font.Bold = true;
                        header.ForeColor = System.Drawing.Color.Blue;
                        header.RenderControl(htw);
                    }
                    htw.WriteLine("</p>");
                    //  render the table into the htmlwriter
                    table.RenderControl(htw);
                    htw.WriteLine("<br>");
                    htw.WriteLine("Report taken on :", System.Drawing.FontStyle.Bold);
                    if (date.Text != null)
                    {
                        date.ForeColor = System.Drawing.Color.Blue;
                        date.RenderControl(htw);
                    }
                    //  render the htmlwriter into the response
                    HttpContext.Current.Response.Write(sw.ToString());
                    HttpContext.Current.Response.End();
                }
            }
        }

    /// <summary>
    /// Replace any of the contained controls with literals
    /// </summary>
    /// <param name="control"></param>
   private static void PrepareControlForExport(Control control)
        {
            for (int i = 0; i < control.Controls.Count; i++)
            {
                Control current = control.Controls[i];
                if (current is LinkButton)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));
                }
                else if (current is ImageButton)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));
                }
                else if (current is HyperLink)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));
                }
                else if (current is DropDownList)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));
                }
                else if (current is CheckBox)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));
                }
                else if (current is Label)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as Label).Text));
                }

                if (current.HasControls())
                {
                    GridViewExportUtil.PrepareControlForExport(current);
                }
            }
        }
    }

并如下使用它

   protected void Button1_Click(object sender, EventArgs e)
       {
    Label1.Visible = true;
    Label2.Visible = true;

    Label1.Text = "Login Information Data";
    Label2.Text = Convert.ToString(System.DateTime.Now);

    if (GridView1.Visible == true)
    {
        // GridViewExportUtil.Export("StateReport.xls", GridView1);
        GridViewExportUtil.ExportGridView("LoginInformation.xls", GridView1, Label1, Label2);
    }

       }

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Answer 3

实施弱点： - 你不会释放你使用的资源； - 您一个一个地导出项目（它非常慢），为此设计了一个范围，您可以在其中设置 object[,] （boxed int, strings, ...）； - 你不处理文本的格式（Excel 关于格式的决定是不正确的）， - 你混合视图和导出逻辑。