我有一个包含 30 多列和 6500 多行的 DataTable。我需要将整个 DataTable 值转储到 Excel 文件中。任何人都可以帮忙处理 C# 代码。我需要每个列值都在一个单元格中。准确地说，我需要 Excel 文件中与 DataTable 完全相同的副本。请帮忙。
谢谢， 波动率
【问题讨论】：
标签： c# asp.net excel datatable export
使用此代码...
dt = city.GetAllCity();//your datatable
string attachment = "attachment; filename=city.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
tab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();
【讨论】：
这个 sn-p 可以更快地实现：
// Example data
DataTable table = new DataTable();
table.Columns.AddRange(new[]{ new DataColumn("Key"), new DataColumn("Value") });
foreach (string name in Request.ServerVariables)
table.Rows.Add(name, Request.ServerVariables[name]);
// This actually makes your HTML output to be downloaded as .xls file
Response.Clear();
Response.ClearContent();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=ExcelFile.xls");
// Create a dynamic control, populate and render it
GridView excel = new GridView();
excel.DataSource = table;
excel.DataBind();
excel.RenderControl(new HtmlTextWriter(Response.Output));
Response.Flush();
Response.End();
【讨论】：
(SERVER_PORT_SECURE, SERVER_PROTOCOL,SERVER_SOFTWARE) 并认为我真的不知道它是什么......这似乎更好，因为我们这样做了不需要覆盖VerifyRenderingInServerForm...你能帮我吗？？
onclick事件调用它
以下链接用于在 C# 代码中将数据表导出到 excel。
http://royalarun.blogspot.in/2012/01/export-datatable-to-excel-in-c-windows.html
using System;
using System.Data;
using System.IO;
using System.Windows.Forms;
namespace ExportExcel
{
public partial class ExportDatatabletoExcel : Form
{
public ExportDatatabletoExcel()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
//Add Datacolumn
DataColumn workCol = dt.Columns.Add("FirstName", typeof(String));
dt.Columns.Add("LastName", typeof(String));
dt.Columns.Add("Blog", typeof(String));
dt.Columns.Add("City", typeof(String));
dt.Columns.Add("Country", typeof(String));
//Add in the datarow
DataRow newRow = dt.NewRow();
newRow["firstname"] = "Arun";
newRow["lastname"] = "Prakash";
newRow["Blog"] = "http://royalarun.blogspot.com/";
newRow["city"] = "Coimbatore";
newRow["country"] = "India";
dt.Rows.Add(newRow);
//open file
StreamWriter wr = new StreamWriter(@"D:\\Book1.xls");
try
{
for (int i = 0; i < dt.Columns.Count; i++)
{
wr.Write(dt.Columns[i].ToString().ToUpper() + "\t");
}
wr.WriteLine();
//write rows to excel file
for (int i = 0; i < (dt.Rows.Count); i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
if (dt.Rows[i][j] != null)
{
wr.Write(Convert.ToString(dt.Rows[i][j]) + "\t");
}
else
{
wr.Write("\t");
}
}
//go to next line
wr.WriteLine();
}
//close file
wr.Close();
}
catch (Exception ex)
{
throw ex;
}
}
}
}
【讨论】：
这篇文章中排名最高的答案，但它是 CSV 文件。它不是实际的 Excel 文件。因此，您在打开文件时会收到警告。
我在网上找到的最佳解决方案是使用 CloseXML https://github.com/closedxml/closedxml 您还需要打开 XML。
dt = city.GetAllCity();//your datatable
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(dt);
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=GridView.xlsx");
using (MemoryStream MyMemoryStream = new MemoryStream())
{
wb.SaveAs(MyMemoryStream);
MyMemoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
}
【讨论】：
我在页面中使用了这个。`
public void DTToExcel(DataTable dt)
{
// dosya isimleri ileride aynı anda birden fazla kullanıcı aynı dosya üzerinde işlem yapmak ister düşüncesiyle guid yapıldı.
string FileName = Guid.NewGuid().ToString();
FileInfo f = new FileInfo(Server.MapPath("Downloads") + string.Format("\\{0}.xlsx", FileName));
if (f.Exists)
f.Delete(); // delete the file if it already exist.
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ClearHeaders();
response.ClearContent();
response.Charset = Encoding.UTF8.WebName;
response.AddHeader("content-disposition", "attachment; filename=" + FileName + ".xls");
response.AddHeader("Content-Type", "application/Excel");
response.ContentType = "application/vnd.xlsx";
//response.AddHeader("Content-Length", file.Length.ToString());
// create a string writer
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw)) //datatable'a aldığımız sorguyu bir datagrid'e atayıp html'e çevir.
{
// instantiate a datagrid
DataGrid dg = new DataGrid();
dg.DataSource = dt;
dg.DataBind();
dg.RenderControl(htw);
response.Write(sw.ToString());
dg.Dispose();
dt.Dispose();
response.End();
}
}
}
【讨论】：
VerifyRenderingInServerForm .... Volkan 我非常感谢您在每行设置 cmets 来解释正在发生的事情，这对其他人有用太.. 亲爱的搜索者，我推荐这种方式
//response.AddHeader("Content-Length", file.Length.ToString());
var lines = new List<string>();
string[] columnNames = dt.Columns.Cast<DataColumn>().
Select(column => column.ColumnName).
ToArray();
var header = string.Join(",", columnNames);
lines.Add(header);
var valueLines = dt.AsEnumerable()
.Select(row => string.Join(",", row.ItemArray));
lines.AddRange(valueLines);
File.WriteAllLines("excel.csv", lines);
这里的 dt 指的是你的 DataTable 传递作为参数
【讨论】：
虽然不是 .NET 实现，但您可能会发现插件 TableTools 可能非常有效，具体取决于您的受众。它依赖于闪存，对于大多数需要实际深入工作然后想要记录表格信息的情况来说，这应该不是问题。
最新版本似乎支持复制到剪贴板、CSV、“.XLS”（实际上只是一个名为 .xls 的制表符分隔文件）、PDF，或创建显示所有行的打印友好页面版本，并且隐藏页面的其余内容。
我在 DataTables 网站上找到了扩展程序：http://datatables.net/extras/tabletools/
可在此处的插件（附加）页面下载：http://datatables.net/extras/
据说它是作为 DataTables 的一部分下载的（因此有短语“DataTables 包中包含的附加内容”），但我在一直使用的下载中没有找到它。看起来效果很好！
【讨论】：
在 Excel 中打开时，大多数答案实际上是生成我并不总是有很好经验的 CSV。
使用ACE OLEDB Provider 也是一种方法（另请参阅connection strings for Excel）。当然，您必须安装并注册提供程序。如果您安装了 Excel，您确实拥有它，但这是您在部署时必须考虑的事情（例如在 Web 服务器上）。
在下面的帮助类代码中，你必须调用类似ExportHelper.CreateXlsFromDataTable(dataset.Tables[0], @"C:\tmp\export.xls");
public class ExportHelper
{
private const string ExcelOleDbConnectionStringTemplate = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=YES\";";
/// <summary>
/// Creates the Excel file from items in DataTable and writes them to specified output file.
/// </summary>
public static void CreateXlsFromDataTable(DataTable dataTable, string fullFilePath)
{
string createTableWithHeaderScript = GenerateCreateTableCommand(dataTable);
using (var conn = new OleDbConnection(String.Format(ExcelOleDbConnectionStringTemplate, fullFilePath)))
{
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
OleDbCommand cmd = new OleDbCommand(createTableWithHeaderScript, conn);
cmd.ExecuteNonQuery();
foreach (DataRow dataExportRow in dataTable.Rows)
{
AddNewRow(conn, dataExportRow);
}
}
}
private static void AddNewRow(OleDbConnection conn, DataRow dataRow)
{
string insertCmd = GenerateInsertRowCommand(dataRow);
using (OleDbCommand cmd = new OleDbCommand(insertCmd, conn))
{
AddParametersWithValue(cmd, dataRow);
cmd.ExecuteNonQuery();
}
}
/// <summary>
/// Generates the insert row command.
/// </summary>
private static string GenerateInsertRowCommand(DataRow dataRow)
{
var stringBuilder = new StringBuilder();
var columns = dataRow.Table.Columns.Cast<DataColumn>().ToList();
var columnNamesCommaSeparated = string.Join(",", columns.Select(x => x.Caption));
var questionmarkCommaSeparated = string.Join(",", columns.Select(x => "?"));
stringBuilder.AppendFormat("INSERT INTO [{0}] (", dataRow.Table.TableName);
stringBuilder.Append(columnNamesCommaSeparated);
stringBuilder.Append(") VALUES(");
stringBuilder.Append(questionmarkCommaSeparated);
stringBuilder.Append(")");
return stringBuilder.ToString();
}
/// <summary>
/// Adds the parameters with value.
/// </summary>
private static void AddParametersWithValue(OleDbCommand cmd, DataRow dataRow)
{
var paramNumber = 1;
for (int i = 0; i <= dataRow.Table.Columns.Count - 1; i++)
{
if (!ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(int)) && !ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(decimal)))
{
cmd.Parameters.AddWithValue("@p" + paramNumber, dataRow[i].ToString().Replace("'", "''"));
}
else
{
object value = GetParameterValue(dataRow[i]);
OleDbParameter parameter = cmd.Parameters.AddWithValue("@p" + paramNumber, value);
if (value is decimal)
{
parameter.OleDbType = OleDbType.Currency;
}
}
paramNumber = paramNumber + 1;
}
}
/// <summary>
/// Gets the formatted value for the OleDbParameter.
/// </summary>
private static object GetParameterValue(object value)
{
if (value is string)
{
return value.ToString().Replace("'", "''");
}
return value;
}
private static string GenerateCreateTableCommand(DataTable tableDefination)
{
StringBuilder stringBuilder = new StringBuilder();
bool firstcol = true;
stringBuilder.AppendFormat("CREATE TABLE [{0}] (", tableDefination.TableName);
foreach (DataColumn tableColumn in tableDefination.Columns)
{
if (!firstcol)
{
stringBuilder.Append(", ");
}
firstcol = false;
string columnDataType = "CHAR(255)";
switch (tableColumn.DataType.Name)
{
case "String":
columnDataType = "CHAR(255)";
break;
case "Int32":
columnDataType = "INTEGER";
break;
case "Decimal":
// Use currency instead of decimal because of bug described at
// http://social.msdn.microsoft.com/Forums/vstudio/en-US/5d6248a5-ef00-4f46-be9d-853207656bcc/localization-trouble-with-oledbparameter-and-decimal?forum=csharpgeneral
columnDataType = "CURRENCY";
break;
}
stringBuilder.AppendFormat("{0} {1}", tableColumn.ColumnName, columnDataType);
}
stringBuilder.Append(")");
return stringBuilder.ToString();
}
}
【讨论】：
Excel 导出的工作代码
try
{
DataTable dt = DS.Tables[0];
string attachment = "attachment; filename=log.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
tab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();
}
catch (Exception Ex)
{ }
【讨论】：
尝试将数据导出到与DataTable中相同的Excel文件，也可以自定义。
dtDataTable1 = ds.Tables[0];
try
{
Microsoft.Office.Interop.Excel.Application ExcelApp = new Microsoft.Office.Interop.Excel.Application();
Workbook xlWorkBook = ExcelApp.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
for (int i = 1; i > 0; i--)
{
Sheets xlSheets = null;
Worksheet xlWorksheet = null;
//Create Excel sheet
xlSheets = ExcelApp.Sheets;
xlWorksheet = (Worksheet)xlSheets.Add(xlSheets[1], Type.Missing, Type.Missing, Type.Missing);
xlWorksheet.Name = "MY FIRST EXCEL FILE";
for (int j = 1; j < dtDataTable1.Columns.Count + 1; j++)
{
ExcelApp.Cells[i, j] = dtDataTable1.Columns[j - 1].ColumnName;
ExcelApp.Cells[1, j].Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Green);
ExcelApp.Cells[i, j].Font.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.WhiteSmoke);
}
// for the data of the excel
for (int k = 0; k < dtDataTable1.Rows.Count; k++)
{
for (int l = 0; l < dtDataTable1.Columns.Count; l++)
{
ExcelApp.Cells[k + 2, l + 1] = dtDataTable1.Rows[k].ItemArray[l].ToString();
}
}
ExcelApp.Columns.AutoFit();
}
((Worksheet)ExcelApp.ActiveWorkbook.Sheets[ExcelApp.ActiveWorkbook.Sheets.Count]).Delete();
ExcelApp.Visible = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
【讨论】：
如果您要使用格式化的标题文本将数据表导出到 Excel，请尝试这样。
public void ExportFullDetails()
{
Int16 id = Convert.ToInt16(Session["id"]);
DataTable registeredpeople = new DataTable();
registeredpeople = this.dataAccess.ExportDetails(eventid);
string attachment = "attachment; filename=Details.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
registeredpeople.Columns["Reg_id"].ColumnName = "Reg. ID";
registeredpeople.Columns["Name"].ColumnName = "Name";
registeredpeople.Columns["Reg_country"].ColumnName = "Country";
registeredpeople.Columns["Reg_city"].ColumnName = "City";
registeredpeople.Columns["Reg_email"].ColumnName = "Email";
registeredpeople.Columns["Reg_business_phone"].ColumnName = "Business Phone";
registeredpeople.Columns["Reg_mobile"].ColumnName = "Mobile";
registeredpeople.Columns["PositionRole"].ColumnName = "Position";
registeredpeople.Columns["Reg_work_type"].ColumnName = "Work Type";
foreach (DataColumn dc in registeredpeople.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in registeredpeople.Rows)
{
tab = "";
for (i = 0; i < registeredpeople.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();
}
【讨论】：
我已经使用以下代码完成了 DataTable 到 Excel 的转换。希望这很容易，无需更改更多内容，只需复制代码并用您的变量替换您的变量，它就会正常工作。
首先在您的解决方案 Document 中创建一个文件夹，然后创建一个 Excel 文件 MyTemplate.xlsx。您可以根据您的要求更改这些名称。但请记住，您还必须在代码中更改名称。
请找到以下代码...
protected void GetExcel_Click(object sender, EventArgs e)
{
ManageTicketBS objManageTicket = new ManageTicketBS();
DataTable DT = objManageTicket.GetAlldataByDate(); //this function will bring the data in DataTable format, you can use your function instate of that.
string DownloadFileName;
string FolderPath;
string FileName = "MyTemplate.xlsx";
DownloadFileName = Path.GetFileNameWithoutExtension(FileName) + new Random().Next(10000, 99999) + Path.GetExtension(FileName);
FolderPath = ".\\" + DownloadFileName;
GetParents(Server.MapPath("~/Document/" + FileName), Server.MapPath("~/Document/" + DownloadFileName), DT);
string path = Server.MapPath("~/Document/" + FolderPath);
FileInfo file = new FileInfo(path);
if (file.Exists)
{
try
{
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ClearContent();
response.ClearHeaders();
response.Buffer = true;
response.ContentType = MimeType(Path.GetExtension(FolderPath));
response.AddHeader("Content-Disposition", "attachment;filename=" + DownloadFileName);
byte[] data = File.ReadAllBytes(path);
response.BinaryWrite(data);
HttpContext.Current.ApplicationInstance.CompleteRequest();
response.End();
}
catch (Exception ex)
{
ex.ToString();
}
finally
{
DeleteOrganisationtoSupplierTemplate(path);
}
}
}
public string GetParents(string FilePath, string TempFilePath, DataTable DTTBL)
{
File.Copy(Path.Combine(FilePath), Path.Combine(TempFilePath), true);
FileInfo file = new FileInfo(TempFilePath);
try
{
DatatableToExcel(DTTBL, TempFilePath, 0);
return TempFilePath;
}
catch (Exception ex)
{
return "";
}
}
public static string MimeType(string Extension)
{
string mime = "application/octetstream";
if (string.IsNullOrEmpty(Extension))
return mime;
string ext = Extension.ToLower();
Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
if (rk != null && rk.GetValue("Content Type") != null)
mime = rk.GetValue("Content Type").ToString();
return mime;
}
static bool DeleteOrganisationtoSupplierTemplate(string filePath)
{
try
{
File.Delete(filePath);
return true;
}
catch (IOException)
{
return false;
}
}
public void DatatableToExcel(DataTable dtable, string pFilePath, int excelSheetIndex=1)
{
try
{
if (dtable != null && dtable.Rows.Count > 0)
{
IWorkbook workbook = null;
ISheet worksheet = null;
using (FileStream stream = new FileStream(pFilePath, FileMode.Open, FileAccess.ReadWrite))
{
workbook = WorkbookFactory.Create(stream);
worksheet = workbook.GetSheetAt(excelSheetIndex);
int iRow = 1;
foreach (DataRow row in dtable.Rows)
{
IRow file = worksheet.CreateRow(iRow);
int iCol = 0;
foreach (DataColumn column in dtable.Columns)
{
ICell cell = null;
object cellValue = row[iCol];
switch (column.DataType.ToString())
{
case "System.Boolean":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Boolean);
if (Convert.ToBoolean(cellValue)) { cell.SetCellFormula("TRUE()"); }
else { cell.SetCellFormula("FALSE()"); }
//cell.CellStyle = _boolCellStyle;
}
break;
case "System.String":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.String);
cell.SetCellValue(Convert.ToString(cellValue));
}
break;
case "System.Int32":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToInt32(cellValue));
//cell.CellStyle = _intCellStyle;
}
break;
case "System.Int64":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToInt64(cellValue));
//cell.CellStyle = _intCellStyle;
}
break;
case "System.Decimal":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToDouble(cellValue));
//cell.CellStyle = _doubleCellStyle;
}
break;
case "System.Double":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToDouble(cellValue));
//cell.CellStyle = _doubleCellStyle;
}
break;
case "System.DateTime":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.String);
DateTime dateTime = Convert.ToDateTime(cellValue);
cell.SetCellValue(dateTime.ToString("dd/MM/yyyy"));
DateTime cDate = Convert.ToDateTime(cellValue);
if (cDate != null && cDate.Hour > 0)
{
//cell.CellStyle = _dateTimeCellStyle;
}
else
{
// cell.CellStyle = _dateCellStyle;
}
}
break;
default:
break;
}
iCol++;
}
iRow++;
}
using (var WritetoExcelfile = new FileStream(pFilePath, FileMode.Create, FileAccess.ReadWrite))
{
workbook.Write(WritetoExcelfile);
WritetoExcelfile.Close();
//workbook.Write(stream);
stream.Close();
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}
您只需要在脚本中复制和删除此代码并添加 命名空间，如下所示，同时更改之前讨论的 excel 文件名。
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.SS.Util;
【讨论】：
请试试这个，这将更快地将您的数据表数据导出到 Excel。
注意：我硬编码的范围“FW”是因为我有 179 列。
public void UpdateExcelApplication(SqlDataTable dataTable)
{
var objects = new string[dataTable.Rows.Count, dataTable.Columns.Count];
var rowIndex = 0;
foreach (DataRow row in dataTable.Rows)
{
var colIndex = 0;
foreach (DataColumn column in dataTable.Columns)
{
objects[rowIndex, colIndex++] = Convert.ToString(row[column]);
}
rowIndex++;
}
var range = this.workSheet.Range[$"A3:FW{dataTable.Rows.Count + 2}"];
range.Value = objects;
this.workSheet.Columns.AutoFit();
this.workSheet.Rows.AutoFit();
}
【讨论】：