我仍在努力解决我的问题。我到处寻找解决方案，无法找到解决方案。我正在使用C＃和ASP.NET，我需要将数据导出到Excel电子表格。
我有一个包含Application对象的应用程序列表。每个Application对象都有一个状态ID。当我将这些应用程序导出到Excel时，我需要一个带有下拉/组合框的列。在此下拉/组合框中应该是数据库中所有状态的列表。然后我需要将状态选择为应用程序状态ID的状态。
另一个问题也与上述情况有关。当用户下载Excel文档时，用户可以通过在下拉列表中选择不同的值来更改每个应用程序的状态。我需要上传此电子表格并循环遍历行，并在下拉/组合框中获取列的值和所选项的值。你会怎么做？这可能吗？
我可能不使用COM组件，所以我尝试使用EPPlus或NPOI（它不一定是这些2），但它似乎不支持我的场景。我怎样才能实现我的方案？再次，它不必使用EPPlus和NPOI。工作实例将不胜感激：）
由于
布伦丹
答案 0 :(得分：2)
您是否尝试在NPOI中使用模板？当我想用NPOI导出复杂的spreasheets时，我创建了一个XLS文档用作模板，并通过C＃填写数据。
答案 1 :(得分：2)
根本不需要宏。 C＃本身会为你做的。 在这里，我有一个Demo，用于从excel（无论是2003/2007）导入到gridview并将gridview（EDITED / changed）数据导出到新的EXCEL FILE。试试吧。 100％工作
您需要做的是：在Web应用程序中创建一个名为“Files”的文件夹，并将您的Excel文件保存在“Files”文件夹中。如果您的数据源（从您的网格填充）不是excel，则不需要上面的文件夹。您可以在btnImport_Click（）中编写自己的代码。 这是您的.aspx页面：
<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="ImportFromExcelToDatasetAndGridviewAndExport.aspx.cs" Inherits="ImportFromExcelToGridViewWebApp.ImportFromExcelToDatasetAndGridviewAndExport" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<div>
<b>Please Select Excel File : </b>
<asp:FileUpload ID="fileuploadExcel" runat="server" />
<asp:Button ID="btnImport" runat="server" Text="Import From Excel" OnClick="btnImport_Click" />
<br />
<asp:Label ID="lblMessage" runat="server" Visible="False" Font-Bold="True" ForeColor="#009933"></asp:Label><br />
<asp:GridView ID="grvExcelData" runat="server" AutoGenerateColumns="false"
onrowdatabound="GridView2_RowDataBound">
<HeaderStyle BackColor="#df5015" Font-Bold="true" ForeColor="White" />
<Columns>
<asp:TemplateField ItemStyle-Width = "150px" HeaderText = "UserName">
<ItemTemplate>
<asp:TextBox ID="txtUserName" runat="server"
CssClass="css2" Text='<%# Eval("UserName")%>'></asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtUserName" runat="server"
CssClass="css2" Text='<%# Eval("UserName")%>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-Width = "150px" HeaderText = "Education">
<ItemTemplate>
<asp:TextBox ID="txtEducation" runat="server"
CssClass="css2" Text='<%# Eval("Education")%>'></asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEducation" runat="server"
CssClass="css2" Text='<%# Eval("Education")%>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-Width = "150px" HeaderText = "Location">
<ItemTemplate>
<asp:TextBox ID="txtLocation" runat="server"
CssClass="css2" Text='<%# Eval("Location")%>'></asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtLocation" runat="server"
CssClass="css2" Text='<%# Eval("Location")%>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Select">
<ItemTemplate>
<asp:DropDownList ID="DrdDatabase" Width="100px" runat="server">
</asp:DropDownList>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="DrdDatabase" Width="100px" runat="server">
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="btnExport" runat="server" Text="Export To Excel" OnClick="btnExport_Click" />
</div>
</asp:Content>
这是你背后的代码。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.IO;
using System.Data.OleDb;
using System.Collections;
namespace ImportFromExcelToGridViewWebApp
{
public partial class ImportFromExcelToDatasetAndGridviewAndExport : System.Web.UI.Page
{
private ArrayList ExcelData
{
get
{
object excel = Session["dropdownvalue"];
if (excel == null) Session["dropdownvalue"] = new ArrayList();
return (ArrayList)Session["dropdownvalue"];
}
set
{
Session["dropdownvalue"] = value;
}
}
protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddl = (DropDownList)e.Row.FindControl("DrdDatabase");
foreach (string colName in ExcelData)
ddl.Items.Add(new ListItem(colName));
}
}
protected void btnImport_Click(object sender, EventArgs e)
{
ArrayList alist = new ArrayList();
string connString = "";
string strFileType = Path.GetExtension(fileuploadExcel.FileName).ToLower();
string fileBasePath = Server.MapPath("~/Files/");
string fileName = Path.GetFileName(this.fileuploadExcel.FileName);
string fullFilePath = fileBasePath + fileName;
//Connection String to Excel Workbook
if (strFileType.Trim() == ".xls")
{
connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fullFilePath +
";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";
}
else if (strFileType.Trim() == ".xlsx")
{
connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fullFilePath +
";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=1\"";
}
if (fileuploadExcel.HasFile)
{
string query = "SELECT [UserName],[Education],[Location] FROM [Sheet1$]";
OleDbConnection conn = new OleDbConnection(connString);
if (conn.State == ConnectionState.Closed)
conn.Open();
OleDbCommand cmd = new OleDbCommand(query, conn);
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
//Assigning dataset table data to GridView Control
Session["griddata"] = ds.Tables[0];
System.Data.DataTable dtt = (System.Data.DataTable)Session["griddata"]; //griddata is the gridview data from another page
var res = (from f in dtt.AsEnumerable()
select f.Field<string>("Location")
);
foreach (string s in res.AsEnumerable())
{
alist.Add(s);
}
Session["dropdownvalue"] = alist;
grvExcelData.DataSource = Session["griddata"];
grvExcelData.DataBind();
da.Dispose();
conn.Close();
conn.Dispose();
}
}
protected void btnExport_Click(object sender, EventArgs e)
{
System.Data.DataTable dtExcel = new DataTable();
dtExcel.Columns.Add("UserName", typeof(string));
dtExcel.Columns.Add("Education", typeof(string));
dtExcel.Columns.Add("Location", typeof(string));
dtExcel.Columns.Add("Select", typeof(string));
foreach (GridViewRow row in grvExcelData.Rows)
{
string UserName = ((TextBox)row.FindControl("txtUserName")).Text;
string Education = ((TextBox)row.FindControl("txtEducation")).Text;
string Location = ((TextBox)row.FindControl("txtLocation")).Text;
string Location2 = ((DropDownList)row.FindControl("DrdDatabase")).Text;
DataRow dr = dtExcel.NewRow();
dr["UserName"] = UserName;
dr["Education"] = Education;
dr["Location"] = Location;
dr["Select"] = Location2;
dtExcel.Rows.Add(dr);
}
CreateWorkbook(dtExcel, Server.MapPath("~/DownlodedFiles/Excel.xls"));
}
public static void CreateWorkbook(System.Data.DataTable dtExcelData, String path)
{
int rowindex = 0;
int columnindex = 1;
Microsoft.Office.Interop.Excel.Application app;
Microsoft.Office.Interop.Excel.Worksheet wksheet;
Microsoft.Office.Interop.Excel.Workbook wkbook;
app = new Microsoft.Office.Interop.Excel.Application();
app.Visible = false;
wkbook = app.Workbooks.Add(true);
wksheet = (Microsoft.Office.Interop.Excel.Worksheet)wkbook.ActiveSheet;
try
{
for (int i = 0; i < dtExcelData.Columns.Count; i++)
{
wksheet.Cells[1, i + 1] = dtExcelData.Columns[i].ColumnName;
}
foreach (DataRow row in dtExcelData.Rows)
{
rowindex++;
columnindex = 0;
foreach (DataColumn col in dtExcelData.Columns)
{
columnindex++;
wksheet.Cells[rowindex + 1, columnindex] = row[col.ColumnName];
}
}
app.Visible = true;
}
catch (Exception ex1)
{
}
app.UserControl = true;
}
}
}