Main
Main
文章目录
  1. 0x00.下载模板
    1. 00.运行环境是 Visual Studio 2015,界面采用 WebForm。
    2. 01.下载事件
  2. 0x02.导入数据
    1. 00.点击导入按钮事件
    2. 01.Excel 转 DataSet
    3. 10.导入操作如果报错
  3. 0x03.导出到 Excel
    1. 00.导出报错’服务器无法在发送 HTTP 标头之后设置内容类型’

Asp.Net之Excel下载模板、导入、导出操作

0x00.下载模板

前提是服务器某文件夹中有这个文件。

00.运行环境是 Visual Studio 2015,界面采用 WebForm。

界面非常简单,2 个 button 按钮控件,1 个 FileUpload1 控件。如图
界面图

01.下载事件

相关代码:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
protected void btnDownload_Click(object sender, EventArgs e)
{
var path = Server.MapPath(("upfiles\\") + "test.xlt"); //upfiles-文件夹 test.xlt-文件
var name = "test.xlt";

try
{
var file = new FileInfo(path);
Response.Clear();
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(name)); //头信息,指定默认文件名
Response.AddHeader("Content-Length", file.Length.ToString());//显示下载进度
Response.ContentType = "application/ms-excel"; // 指定返回的是一个不能被客户端读取的流,必须被下载
Response.WriteFile(file.FullName); // 把文件流发送到客户端

HttpContext.Current.ApplicationInstance.CompleteRequest();
}
catch (Exception ex)
{
Response.Write("<script>alert('错误:" + ex.Message + ",请尽快与管理员联系')</script>");
}
}

0x02.导入数据

首先准备好一个 Excel 模板。利用 FileUpload1 控件和 Button 按钮进行上传

00.点击导入按钮事件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
protected void btnImport_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile == false) //判断是否包含一个文件
{
Response.Write("<script>alert('请您选择Excel文件!')</script>");//未上传就点击了导入按钮
return;
}
string isXls = Path.GetExtension(FileUpload1.FileName).ToString().ToLower();//获得文件的扩展名
var extenLen = isXls.Length;

if (!isXls.Contains(".xls")) //判断是否 是excel文件
{
Response.Write("<script>alert('只可以选择Excel文件!')</script>");
return;
}

string filename = FileUpload1.FileName; //获取Excle文件名
string savePath = Server.MapPath(("upfiles\\") + filename);//Server.MapPath 获得虚拟服务器相对路径
string savePath2 = Server.MapPath(("upfiles\\"));

if (!Directory.Exists(savePath2)) //如果不存在upfiles文件夹则创建
{
Directory.CreateDirectory(savePath2);
}
FileUpload1.SaveAs(savePath); //SaveAs 将上传的文件内容保存在服务器上
var ds = ExcelSqlConnection(savePath, filename); //将Excel转成DataSet
var dtRows = ds.Tables[0].Rows.Count;
var dt = ds.Tables[0];
if (dtRows == 0)
{
Response.Write("<script>alert('Excel表无数据!')</script>");
return;
}
try
{
for(int i = 0; i < dt.Rows.Count; i++)
{
string ve = dt.Rows[i]["车号"].ToString();
if (string.IsNullOrEmpty(ve)) //因数据库中车号不能为空 所以表格中车号为空的跳过这行
{
continue;
}
//用自己的方式保存进数据库ADO/EF/...
var model = new TEST(); //实体
model.id = 1;
model.ve = ve;
model.name = dt.Rows[i]["姓名"].ToString();
model.Update();
}
}catch (Exception ex)
{
Response.Write("<script>alert('" + ex.Message + "')</script>");
}

}
01.Excel 转 DataSet
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
private DataSet ExcelSqlConnection(string savePath, string tableName)
{
//string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + savePath + ";Extended Properties='Excel 8.0;HDR=YES;IMEX=1'";
string strCon = "Provider=Microsoft.Ace.OLEDB.12.0;" + "data source=" + savePath + ";Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'"; //HDR=YES Excel文件的第一行是列名而不是数据 IMEX=1可必免数据类型冲突
var excelConn = new OleDbConnection(strCon);
try
{
string strCom = string.Format("SELECT * FROM [Sheet1$]");
excelConn.Open();
OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, excelConn);
DataSet ds = new DataSet();
myCommand.Fill(ds, "[" + tableName + "$]");
excelConn.Close();
return ds;
}
catch (Exception)
{
excelConn.Close();
//Response.Write("<script>alert('" + ex.Message + "')</script>");
return null;
}

}
10.导入操作如果报错

错误代码为:未在本地计算机上注册“Microsoft.ACE.OLEDB.12.0”提供程序
解决办法(两者择其一):

  • 1.将平台换成 X86
  • 2.安装 AccessDatabaseEngine.exe (详情百度)

0x03.导出到 Excel

插件采用 MyXLS.
引用 using org.in2bits.MyXls;
以下代码大部分基本不用改。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
private void Export()
{
XlsDocument xls = new XlsDocument();
org.in2bits.MyXls.Cell cell;
int rowIndex = 2;

xls.FileName = DateTime.Now.ToString().Replace("-", "").Replace(":", "").Replace(" ", "") + HttpUtility.UrlEncode("TEST") + ".xls"; //TEST要改
Worksheet sheet = xls.Workbook.Worksheets.AddNamed("TEST");//状态栏标题名称
org.in2bits.MyXls.Cells cells = sheet.Cells;

#region 导出Excel列宽
ColumnInfo colInfo = new ColumnInfo(xls, sheet);
colInfo.ColumnIndexStart = 0;
colInfo.ColumnIndexEnd = 2;
colInfo.Width = 15 * 300;
sheet.AddColumnInfo(colInfo);
#endregion

#region 表头
MergeArea area = new MergeArea(1, 1, 1, 2); //MergeArea(int rowMin, int rowMax, int colMin, int colMax)
org.in2bits.MyXls.Cell cellTitle = cells.AddValueCell(1, 1, "TEST"); //Excel 第一行第1到2列显示TEST
sheet.AddMergeArea(area);
cellTitle.Font.Height = 20 * 20;
cellTitle.Font.Bold = true;//设置标题行的字体为粗体
cellTitle.Font.FontFamily = FontFamilies.Roman;//设置标题行的字体为FontFamilies.Roman
cellTitle.HorizontalAlignment = HorizontalAlignments.Centered;

area = new MergeArea(2, 2, 1, 1);
cellTitle = cells.AddValueCell(2, 1, "车号"); //第二行第一列 显示车号
sheet.AddMergeArea(area);
cellTitle.Font.Bold = true;
cellTitle.Font.Height = 16 * 16;
cellTitle.Font.FontFamily = FontFamilies.Roman;
cellTitle.HorizontalAlignment = HorizontalAlignments.Centered;
cellTitle.VerticalAlignment = VerticalAlignments.Centered;
cellTitle.TopLineStyle = 1;
cellTitle.BottomLineStyle = 1;
cellTitle.LeftLineStyle = 1;
cellTitle.RightLineStyle = 1;

area = new MergeArea(2, 2, 2, 2);
cellTitle = cells.AddValueCell(2, 2, "姓名");
sheet.AddMergeArea(area);
cellTitle.Font.Bold = true;
cellTitle.Font.Height = 16 * 16;
cellTitle.Font.FontFamily = FontFamilies.Roman;
cellTitle.HorizontalAlignment = HorizontalAlignments.Centered;
cellTitle.VerticalAlignment = VerticalAlignments.Centered;
cellTitle.TopLineStyle = 1;
cellTitle.BottomLineStyle = 1;
cellTitle.LeftLineStyle = 1;
cellTitle.RightLineStyle = 1;

#endregion

var list = GetList(); //获取数据

for (int i = 0; i < list.Count; i++)
{
rowIndex++;
cell = cells.AddValueCell(rowIndex, 1, list[i].VehicleNO); //车号
cell.TopLineStyle = 1;
cell.BottomLineStyle = 1;
cell.LeftLineStyle = 1;
cell.RightLineStyle = 1;

cell = cells.AddValueCell(rowIndex, 2, list[i].Name); //姓名
cell.TopLineStyle = 1;
cell.BottomLineStyle = 1;
cell.LeftLineStyle = 1;
cell.RightLineStyle = 1;

}
xls.Send();
}
00.导出报错’服务器无法在发送 HTTP 标头之后设置内容类型’

详见:服务器无法在发送 HTTP 标头之后设置内容类型

支持一下
  • 微信扫一扫
  • 支付宝扫一扫