如何使用C#创建Excel电子表格而不需要在运行代码的计算机上安装Excel？
当前回答
这里有一个完全免费的C#库，它允许您使用OpenXML库从DataSet、DataTable或List<>导出到真正的Excel 2007.xlsx文件中：
http://mikesknowledgebase.com/pages/CSharp/ExportToExcel.htm
免费提供完整的源代码以及说明和演示应用程序。
将此类添加到应用程序后，只需一行代码即可将DataSet导出到Excel：
CreateExcelFile.CreateExcelDocument(myDataSet, "C:\\Sample.xlsx");
没有比这更简单的了。。。
它甚至不需要Excel出现在您的服务器上。
其他回答
要将xls保存为xlsx格式，我们只需要从Microsoft.Office.Interop.Excel库调用SaveAs方法。该方法将采用大约16个参数，其中一个参数是文件格式。
Microsoft文档：此处另存为方法参数
我们需要传递的对象如下
wb.SaveAs(filename, 51, System.Reflection.Missing.Value,
System.Reflection.Missing.Value, false, false, 1,1, true,
System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value)
这里，51是XLSX的枚举值
对于不同文件格式的另存为，可以参考xlFileFormat
您可以使用OLEDB创建和操作Excel文件。选中此项：使用OLEDB读写Excel。
典型示例：
using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\temp\\test.xls;Extended Properties='Excel 8.0;HDR=Yes'"))
{
conn.Open();
OleDbCommand cmd = new OleDbCommand("CREATE TABLE [Sheet1] ([Column1] string, [Column2] string)", conn);
cmd.ExecuteNonQuery();
}
编辑-更多链接：
嘿，脚本人！如何在不使用Excel的情况下从Excel读取？如何使用ADO.NET在Visual Basic.NET中检索和修改Excel工作簿中的记录使用ADO.NET C#DbProviderFactory读写Excel电子表格
您可以使用此库创建格式良好的Excel文件：http://officehelper.codeplex.com/documentation参见以下示例：
using (ExcelHelper helper = new ExcelHelper(TEMPLATE_FILE_NAME, GENERATED_FILE_NAME))
{
helper.Direction = ExcelHelper.DirectionType.TOP_TO_DOWN;
helper.CurrentSheetName = "Sheet1";
helper.CurrentPosition = new CellRef("C3");
//the template xlsx should contains the named range "header"; use the command "insert"/"name".
helper.InsertRange("header");
//the template xlsx should contains the named range "sample1";
//inside this range you should have cells with these values:
//<name> , <value> and <comment>, which will be replaced by the values from the getSample()
CellRangeTemplate sample1 = helper.CreateCellRangeTemplate("sample1", new List<string> {"name", "value", "comment"});
helper.InsertRange(sample1, getSample());
//you could use here other named ranges to insert new cells and call InsertRange as many times you want,
//it will be copied one after another;
//even you can change direction or the current cell/sheet before you insert
//typically you put all your "template ranges" (the names) on the same sheet and then you just delete it
helper.DeleteSheet("Sheet3");
}
示例如下：
private IEnumerable<List<object>> getSample()
{
var random = new Random();
for (int loop = 0; loop < 3000; loop++)
{
yield return new List<object> {"test", DateTime.Now.AddDays(random.NextDouble()*100 - 50), loop};
}
}
我编写了一个简单的代码，通过使用System.IO.StreamWriter将数据集导出到excel，而不使用excel对象。
下面是代码，它将从数据集中读取所有表，并将它们逐一写入工作表。我从这篇文章中得到了帮助。
public static void exportToExcel(DataSet source, string fileName)
{
const string endExcelXML = "</Workbook>";
const string startExcelXML = "<xml version>\r\n<Workbook " +
"xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n" +
" xmlns:o=\"urn:schemas-microsoft-com:office:office\"\r\n " +
"xmlns:x=\"urn:schemas- microsoft-com:office:" +
"excel\"\r\n xmlns:ss=\"urn:schemas-microsoft-com:" +
"office:spreadsheet\">\r\n <Styles>\r\n " +
"<Style ss:ID=\"Default\" ss:Name=\"Normal\">\r\n " +
"<Alignment ss:Vertical=\"Bottom\"/>\r\n <Borders/>" +
"\r\n <Font/>\r\n <Interior/>\r\n <NumberFormat/>" +
"\r\n <Protection/>\r\n </Style>\r\n " +
"<Style ss:ID=\"BoldColumn\">\r\n <Font " +
"x:Family=\"Swiss\" ss:Bold=\"1\"/>\r\n </Style>\r\n " +
"<Style ss:ID=\"StringLiteral\">\r\n <NumberFormat" +
" ss:Format=\"@\"/>\r\n </Style>\r\n <Style " +
"ss:ID=\"Decimal\">\r\n <NumberFormat " +
"ss:Format=\"0.0000\"/>\r\n </Style>\r\n " +
"<Style ss:ID=\"Integer\">\r\n <NumberFormat " +
"ss:Format=\"0\"/>\r\n </Style>\r\n <Style " +
"ss:ID=\"DateLiteral\">\r\n <NumberFormat " +
"ss:Format=\"mm/dd/yyyy;@\"/>\r\n </Style>\r\n " +
"</Styles>\r\n ";
System.IO.StreamWriter excelDoc = null;
excelDoc = new System.IO.StreamWriter(fileName);
int sheetCount = 1;
excelDoc.Write(startExcelXML);
foreach (DataTable table in source.Tables)
{
int rowCount = 0;
excelDoc.Write("<Worksheet ss:Name=\"" + table.TableName + "\">");
excelDoc.Write("<Table>");
excelDoc.Write("<Row>");
for (int x = 0; x < table.Columns.Count; x++)
{
excelDoc.Write("<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");
excelDoc.Write(table.Columns[x].ColumnName);
excelDoc.Write("</Data></Cell>");
}
excelDoc.Write("</Row>");
foreach (DataRow x in table.Rows)
{
rowCount++;
//if the number of rows is > 64000 create a new page to continue output
if (rowCount == 64000)
{
rowCount = 0;
sheetCount++;
excelDoc.Write("</Table>");
excelDoc.Write(" </Worksheet>");
excelDoc.Write("<Worksheet ss:Name=\"" + table.TableName + "\">");
excelDoc.Write("<Table>");
}
excelDoc.Write("<Row>"); //ID=" + rowCount + "
for (int y = 0; y < table.Columns.Count; y++)
{
System.Type rowType;
rowType = x[y].GetType();
switch (rowType.ToString())
{
case "System.String":
string XMLstring = x[y].ToString();
XMLstring = XMLstring.Trim();
XMLstring = XMLstring.Replace("&", "&");
XMLstring = XMLstring.Replace(">", ">");
XMLstring = XMLstring.Replace("<", "<");
excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +
"<Data ss:Type=\"String\">");
excelDoc.Write(XMLstring);
excelDoc.Write("</Data></Cell>");
break;
case "System.DateTime":
//Excel has a specific Date Format of YYYY-MM-DD followed by
//the letter 'T' then hh:mm:sss.lll Example 2005-01-31T24:01:21.000
//The Following Code puts the date stored in XMLDate
//to the format above
DateTime XMLDate = (DateTime)x[y];
string XMLDatetoString = ""; //Excel Converted Date
XMLDatetoString = XMLDate.Year.ToString() +
"-" +
(XMLDate.Month < 10 ? "0" +
XMLDate.Month.ToString() : XMLDate.Month.ToString()) +
"-" +
(XMLDate.Day < 10 ? "0" +
XMLDate.Day.ToString() : XMLDate.Day.ToString()) +
"T" +
(XMLDate.Hour < 10 ? "0" +
XMLDate.Hour.ToString() : XMLDate.Hour.ToString()) +
":" +
(XMLDate.Minute < 10 ? "0" +
XMLDate.Minute.ToString() : XMLDate.Minute.ToString()) +
":" +
(XMLDate.Second < 10 ? "0" +
XMLDate.Second.ToString() : XMLDate.Second.ToString()) +
".000";
excelDoc.Write("<Cell ss:StyleID=\"DateLiteral\">" +
"<Data ss:Type=\"DateTime\">");
excelDoc.Write(XMLDatetoString);
excelDoc.Write("</Data></Cell>");
break;
case "System.Boolean":
excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +
"<Data ss:Type=\"String\">");
excelDoc.Write(x[y].ToString());
excelDoc.Write("</Data></Cell>");
break;
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.Byte":
excelDoc.Write("<Cell ss:StyleID=\"Integer\">" +
"<Data ss:Type=\"Number\">");
excelDoc.Write(x[y].ToString());
excelDoc.Write("</Data></Cell>");
break;
case "System.Decimal":
case "System.Double":
excelDoc.Write("<Cell ss:StyleID=\"Decimal\">" +
"<Data ss:Type=\"Number\">");
excelDoc.Write(x[y].ToString());
excelDoc.Write("</Data></Cell>");
break;
case "System.DBNull":
excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +
"<Data ss:Type=\"String\">");
excelDoc.Write("");
excelDoc.Write("</Data></Cell>");
break;
default:
throw (new Exception(rowType.ToString() + " not handled."));
}
}
excelDoc.Write("</Row>");
}
excelDoc.Write("</Table>");
excelDoc.Write(" </Worksheet>");
sheetCount++;
}
excelDoc.Write(endExcelXML);
excelDoc.Close();
}
我想知道为什么没有人建议PowerShell使用免费的ImportExcel模块；它可以轻松创建XML Excel文件（xlsx）。
从SQL Server等数据库创建Excel工作表时尤其容易。。。
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