我开发了一个应用程序，我必须将数据从数据库插入Excel，插入数据的大小是预定义的。
假设任何城市有20条记录。现在一开始我只需要插入5条记录，然后在向用户查看一些消息之后，接着将5个数据附加到同一个Excel文件中，依此类推。
以下是我将数据插入Excel的代码，其大小在Web.Config文件中定义。
Web.Config代码：
<appSettings>
<add key="UserRecord" value="6"/>
</appSettings>
代码：
public void InsertRecordToExcel()
{
DAL ObjDal = new DAL();
string record = ConfigurationManager.AppSettings["UserRecord"];
try
{
int n = Convert.ToInt32(record);
string filename = Server.MapPath("UserDataSheet");
string City = TxtCityName.Text;
DataTable dt = new DataTable();
dt = ObjDal.GetData(City);
while(dt.Rows.Count>0)
{
StringWriter writer = new StringWriter();
HtmlTextWriter htmlWriter = new HtmlTextWriter(writer);
GridView gridView = new GridView();
DataTable dtn = new DataTable();
gridView.DataSource = dt.AsEnumerable().Take(n).CopyToDataTable();
gridView.AutoGenerateColumns = true;
gridView.DataBind();
gridView.RenderControl(htmlWriter);
htmlWriter.Close();
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=" + filename + ".xls");
Response.Charset = "";
Response.Write(writer.ToString());
Response.End();
LblMessage.Text = n + " " + "Record Added Successfully";
}
}
catch (Exception ex)
{
throw ex;
}
}
将数据附加到Excel文件的步骤是什么？
答案 0 :(得分：1)
您可以使用xmlwriter创建excel文件。或者更舒适的方式是使用库。 （Create Excel (.XLS and .XLSX) file from C#）
与图书馆：
void export_Click(object sender, EventArgs e){
byte[] data = File.ReadAllBytes("export.xls"); //The created excel file with the library, if the library supports getting the excel as a stream you can use the method below to stream it.
string filename = "export.xls";
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment; filename="+filename);
Response.AddHeader("Content-Type", "application/Excel");
Response.ContentType = "application/vnd.xls";
Response.AddHeader("Content-Length", bytesInStream.Length.ToString());
Response.BinaryWrite(data);
Response.End();
}
使用xml的方法：
void export_Click(object sender, EventArgs e){
MemoryStream ms = ExportDataTableToWorksheet(ds, ds2, true);
byte[] bytesInStream = ms.ToArray();
string filename = "export.xls";
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment; filename="+filename);
Response.AddHeader("Content-Type", "application/Excel");
Response.ContentType = "application/vnd.xls";
Response.AddHeader("Content-Length", bytesInStream.Length.ToString());
Response.BinaryWrite(bytesInStream);
Response.End();
}
public static MemoryStream ExportDataTableToWorksheet(DataSet ds)
{
MemoryStream ms = new MemoryStream();
XmlTextWriter writer = new XmlTextWriter(ms, Encoding.UTF8);
writer.Formatting = Formatting.Indented;
// <?xml version="1.0"?>
writer.WriteStartDocument();
// <?mso-application progid="Excel.Sheet"?>
writer.WriteProcessingInstruction("mso-application", "progid=\"Excel.Sheet\"");
// <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet >"
writer.WriteStartElement("Workbook", "urn:schemas-microsoft-com:office:spreadsheet");
// Namespace definitions
writer.WriteAttributeString("xmlns", "o", null, "urn:schemas-microsoft-com:office:office");
writer.WriteAttributeString("xmlns", "x", null, "urn:schemas-microsoft-com:office:excel");
writer.WriteAttributeString("xmlns", "ss", null, "urn:schemas-microsoft-com:office:spreadsheet");
writer.WriteAttributeString("xmlns", "html", null, "http://www.w3.org/TR/REC-html40");
// <DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">
writer.WriteStartElement("DocumentProperties", "urn:schemas-microsoft-com:office:office");
// Documentattributes Author, Date, Company
writer.WriteElementString("Author", Environment.UserName);
writer.WriteElementString("LastAuthor", Environment.UserName);
writer.WriteElementString("Created", DateTime.Now.ToString("u") + "Z");
writer.WriteElementString("Company", "Unknown");
writer.WriteElementString("Version", "11.8122");
// </DocumentProperties>
writer.WriteEndElement();
// <ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel">
writer.WriteStartElement("ExcelWorkbook", "urn:schemas-microsoft-com:office:excel");
// Workbook-Preferences
writer.WriteElementString("WindowHeight", "13170");
writer.WriteElementString("WindowWidth", "17580");
writer.WriteElementString("WindowTopX", "120");
writer.WriteElementString("WindowTopY", "60");
writer.WriteElementString("ProtectStructure", "False");
writer.WriteElementString("ProtectWindows", "False");
// </ExcelWorkbook>
writer.WriteEndElement();
// <Styles>
writer.WriteStartElement("Styles");
// <Style ss:ID="Default" ss:Name="Normal">
writer.WriteStartElement("Style");
writer.WriteAttributeString("ss", "ID", null, "Default");
writer.WriteAttributeString("ss", "Name", null, "Normal");
// <Alignment ss:Vertical="Bottom"/>
writer.WriteStartElement("Alignment");
writer.WriteAttributeString("ss", "Vertical", null, "Bottom");
writer.WriteEndElement();
// Verbleibende Sytle-Eigenschaften leer schreiben
writer.WriteElementString("Borders", null);
writer.WriteElementString("Font", null);
writer.WriteElementString("Interior", null);
writer.WriteElementString("NumberFormat", null);
writer.WriteElementString("Protection", null);
// </Style>
writer.WriteEndElement();
// </Styles>
writer.WriteEndElement();
// <Worksheet ss:Name="xxx">
writer.WriteStartElement("Worksheet");
writer.WriteAttributeString("ss", "Name", null, "export");
// <Table ss:ExpandedColumnCount="2" ss:ExpandedRowCount="3" x:FullColumns="1" x:FullRows="1" ss:DefaultColumnWidth="60">
writer.WriteStartElement("Table");
// setting the column count
writer.WriteAttributeString("ss", "ExpandedColumnCount", null, "1");
else writer.WriteAttributeString("ss", "ExpandedRowCount", null, (ds.Tables[0].Rows.Count).ToString());
writer.WriteAttributeString("x", "FullColumns", null, "1");
writer.WriteAttributeString("x", "FullRows", null, "1");
writer.WriteAttributeString("ss", "DefaultColumnWidth", null, "100");
foreach (DataRow row in ds.Tables[0].Rows)
{
// <Row>
writer.WriteStartElement("Row");
// Alle Zellen der aktuellen Zeile durchlaufen
writeCell(writer, (string)row["name"]);
// </Row>
writer.WriteEndElement();
}
// </Table>
writer.WriteEndElement();
// <WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
writer.WriteStartElement("WorksheetOptions", "urn:schemas-microsoft-com:office:excel");
// pagesetup
writer.WriteStartElement("PageSetup");
writer.WriteStartElement("Header");
writer.WriteAttributeString("x", "Margin", null, "0.4921259845");
writer.WriteEndElement();
writer.WriteStartElement("Footer");
writer.WriteAttributeString("x", "Margin", null, "0.4921259845");
writer.WriteEndElement();
writer.WriteStartElement("PageMargins");
writer.WriteAttributeString("x", "Bottom", null, "0.984251969");
writer.WriteAttributeString("x", "Left", null, "0.78740157499999996");
writer.WriteAttributeString("x", "Right", null, "0.78740157499999996");
writer.WriteAttributeString("x", "Top", null, "0.984251969");
writer.WriteEndElement();
writer.WriteEndElement();
// <Selected/>
writer.WriteElementString("Selected", null);
// <Panes>
writer.WriteStartElement("Panes");
// <Pane>
writer.WriteStartElement("Pane");
//
writer.WriteElementString("Number", "1");
writer.WriteElementString("ActiveRow", "1");
writer.WriteElementString("ActiveCol", "1");
// </Pane>
writer.WriteEndElement();
// </Panes>
writer.WriteEndElement();
// <ProtectObjects>False</ProtectObjects>
writer.WriteElementString("ProtectObjects", "False");
// <ProtectScenarios>False</ProtectScenarios>
writer.WriteElementString("ProtectScenarios", "False");
// </WorksheetOptions>
writer.WriteEndElement();
// </Worksheet>
writer.WriteEndElement();
// </Workbook>
writer.WriteEndElement();
writer.Flush();
writer.Close();
return ms;
}
/// <summary>
/// Removes control characters and other non-UTF-8 characters
/// </summary>
/// <param name="inString">The string to process</param>
/// <returns>A string with no control characters or entities above 0x00FD</returns>
public static string RemoveTroublesomeCharacters(string input)
{
var isValid = new Predicate<char>(value =>
(value >= 0x0020 && value <= 0xD7FF) ||
(value >= 0xE000 && value <= 0xFFFD) ||
value == 0x0009 ||
value == 0x000A ||
value == 0x000D);
return new string(Array.FindAll(input.ToCharArray(), isValid));
}
static void writeCell(XmlTextWriter writer, string value)
{
// <Cell>
writer.WriteStartElement("Cell");
// <Data ss:Type="String">xxx</Data>
writer.WriteStartElement("Data");
writer.WriteAttributeString("ss", "Type", null, "String");
// Zelleninhakt schreiben
writer.WriteValue(value);
// </Data>
writer.WriteEndElement();
// </Cell>
writer.WriteEndElement();
}
答案 1 :(得分：0)
＆＃34;在向用户查看一些消息后＃34; - 这是什么信息，你在哪里展示这个？ 假设此消息在Web /桌面上，只需将前5条记录插入excel，维护excel工作簿实例，显示消息，将下一组数据插入活动工作簿。
还有一个想法是使用数据表，只有当用户下载excel时你才能填写excel
如果您能解释显示消息的重要性，将会很有帮助