将网格视图导出到 excel 并将 excel 文件保存到文件夹

Question

我想保存导出网格视图数据的excel文件。我已经编写了将gridview数据导出到excel的代码，但我不知道如何保存导出的文件。

以下是我将 gridview 导出到 excel 的代码：

Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("content-disposition", "attachment;filename=MyFiles.xls");
Response.Charset = "";
this.EnableViewState = false;
System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
gvFiles.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();

Answer 1

您在询问如何保存导出的文件...您的代码将呈现的 gridview (HTML) 内容放入响应中。在这种情况下，您的浏览器（客户端）将收到此响应并弹出一个对话框询问保存位置。所以您的浏览器会为您保存文件。

如果你想将它保存在服务器端，你不能将渲染的 gridview 放入响应中。而是将其写入本地硬盘上的文件（如上面的答案所示）。

请记住，在您自己的开发机器以外的环境（即生产环境）中，ASP.NET 工作进程可能没有足够的访问权限来写入硬盘上的指定位置。以下是解决该问题的几个答案：

ASP.net user account permissions
ASP.NET + Access to the path is denied
System.UnauthorizedAccessException: Access to the path is denied

Answer 2

你可以这样做：

private void ExportGridView()
{
    System.IO.StringWriter sw = new System.IO.StringWriter();
    System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);

    // Render grid view control.
    gvFiles.RenderControl(htw);

    // Write the rendered content to a file.
    string renderedGridView = sw.ToString();
    System.IO.File.WriteAllText(@"C:\Path\On\Server\ExportedFile.xlsx", renderedGridView);
}

Answer 3

这可能会对你有所帮助//

protected void exporttoexcel_Click(object sender, EventArgs e)
{
    Response.Clear();

    Response.AddHeader("content-disposition", "attachment;filename=" attachment" + ".xls");

    Response.Charset = "";

    // If you want the option to open the Excel file without saving than

    // comment out the line below

    // Response.Cache.SetCacheability(HttpCacheability.NoCache);

    Response.ContentType = "application/vnd.xls";

    System.IO.StringWriter stringWrite = new System.IO.StringWriter();

    System.Web.UI.HtmlTextWriter htmlWrite =
    new HtmlTextWriter(stringWrite);

    GridView1.RenderControl(htmlWrite);

    Response.Write(stringWrite.ToString());

    Response.End();

}
public override void VerifyRenderingInServerForm(Control control)
{

    // Confirms that an HtmlForm control is rendered for the
    //specified ASP.NET server control at run time.

}

Answer 4

点击链接：C# Excel file OLEDB read HTML IMPORT

使用Extended Properties=\"HTML Import;HDR=No;IMEX=1 the select * from [tablename]， 表名从GetOleDbSchemaTable返回。

注意：这不会加载正常的 excel。为此使用Extended Properties=\"Excel 8.0;HDR=No;IMEX=1\，其中表名将带有$ 符号。

查看示例代码： Can't read excel file after creating it using File.WriteAllText() function

Answer 5

public partial class exportgridtoexcel : System.Web.UI.Page
{
    SqlConnection con=new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString.ToString());
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            GetData();
        }
    }
    public void GetData()
    {
        SqlDataAdapter sda = new SqlDataAdapter("select * from EmpData", con);
        DataTable dt = new DataTable();
        sda.Fill(dt);
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

    protected void btnDownload_Click(object sender, EventArgs e)
    {
        GetData();
        exporttoexcel("Report.xls", GridView1);
        GridView1 = null;
        GridView1.Dispose();



    }
    public void exporttoexcel(string filename,GridView gv)
    {
        Response.ClearContent();
        Response.AddHeader("content-disposition", "attachment;filename=" + filename);
        Response.ContentType = "applicatio/excel";
        StringWriter sw = new StringWriter(); ;
        HtmlTextWriter htm=new HtmlTextWriter(sw);
        gv.RenderControl(htm);
        Response.Write(sw.ToString());
        Response.End();
    }
    public override void VerifyRenderingInServerForm(Control control)
    {

    }
}

}

Answer 6

这里解决了这个问题的另一个解决方案：http://codentq.wordpress.com/2014/02/13/write-excel-file-from-dataset/

您必须通过本文提到的方法在数据集中获取网格视图数据：http://codentq.wordpress.com/2014/02/13/get-data-from-grid-to-datatable-or-dataset/

Answer 7

首先将EPPLUS参考库添加到应用程序中，使用OfficeOpenXml添加；

//业务对象类

类 bocl {

    string name;

    public string NAME
    {
        get { return name; }
        set { name = value; }
    }
    string id;

    public string ID
    {
        get { return id; }
        set { id = value; }
    }



    public bocls() { }
    public bocls(string name, string id)
    {
        this.name = name;
        this.id = id;         

    }

//在导出按钮点击事件中

protected void lbtnExport_Click(object sender, EventArgs e) {

            List<bocls> list6 =  new List<bocls>();
           //copy the grid view values into list
            list6 = (from row in dataGridView1.Rows.Cast<DataGridViewRow>()
            from cell in row.Cells.Cast<DataGridViewCell>()
            select new 
            {
                //project into your new class from the row and cell vars.
            }).ToList();
    }
            ExcelPackage excel = new ExcelPackage();
            var workSheet = excel.Workbook.Worksheets.Add("Products");
            var totalCols = GridView1.Rows[0].Cells.Count;
            var totalRows = GridView1.Rows.Count;
            var headerRow = GridView1.HeaderRow;
            for (var i = 1; i <= totalCols; i++)
            {
                workSheet.Cells[1, i].Value = headerRow.Cells[i - 1].Text;
            }
            for (var j = 1; j <= totalRows; j++)
            {
                for (var i = 1; i <= totalCols; i++)
                {
                    var item = list6.ElementAt(j - 1);

                    workSheet.Column(1).Width = 13;
                    workSheet.Column(2).Width = 10;

                    workSheet.Cells[j + 1, i].Style.WrapText = true;

                    if (headerRow.Cells[i - 1].Text == "ID")
                        workSheet.Cells[j + 1, i].Value = item.GetType().GetProperty("id").GetValue(item, null);
                    else if (headerRow.Cells[i - 1].Text == "NAME")
                        workSheet.Cells[j + 1, i].Value = item.GetType().GetProperty("name").GetValue(item, null);

                    workSheet.Cells[j + 1, i].Value = workSheet.Cells[j + 1, i].Value.ToString().Replace("<br/>", "");
                }
            }
            using (var memoryStream = new MemoryStream())
            {

                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                string filename = Guid.NewGuid().ToString() + ".xlsx";
                Response.AddHeader("content-disposition", "attachment;  filename=" + filename);
                excel.SaveAs(memoryStream);   
                //add your destination folder
                FileStream fileStream = new FileStream(@"C:\Users\karthi\Downloads\New folder\" + filename, FileMode.Create,FileAccess.Write,FileShare.Write);
                memoryStream.WriteTo(fileStream);
                fileStream.Close();
                memoryStream.WriteTo(Response.OutputStream);
                memoryStream.Close();
                memoryStream.WriteTo(Response.OutputStream);
                Response.Flush();
                Response.End();
            }

    }