如何一个DataTable变量导出到EXCEL和下载Excel

我试图使用NPOI这样的：如何一个DataTable变量导出到EXCEL和下载Excel

private Stream RenderDataTableToExcel(DataTable SourceTable) 
{ 
    XSSFWorkbook workbook = null; 
    MemoryStream ms = null; 
    ISheet sheet = null; 
    XSSFRow headerRow = null; 
    try 
    { 
     workbook = new XSSFWorkbook(); 
     ms = new MemoryStream(); 
     sheet = workbook.CreateSheet(); 
     headerRow = (XSSFRow)sheet.CreateRow(0); 
     foreach(DataColumn column in SourceTable.Columns) 
      headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); 
     int rowIndex = 1; 
     foreach(DataRow row in SourceTable.Rows) 
     { 
      XSSFRow dataRow = (XSSFRow)sheet.CreateRow(rowIndex); 
      foreach(DataColumn column in SourceTable.Columns) 
       dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString()); 
      ++rowIndex; 
     } 
     for (int i = 0; i <= SourceTable.Columns.Count; ++i) 
      sheet.AutoSizeColumn(i); 
     workbook.Write(ms); 
     ms.Flush(); 
    } 
    catch (Exception ex) 
    { 
     return null; 
    } 
    finally 
    { 
     ms.Close(); 
     sheet = null; 
     headerRow = null; 
     workbook = null; 
    } 
    return ms; 
} 
private void DownloadExcel(DataTable dt, string reportName) 
{ 
    Stream s = RenderDataTableToExcel(dt); 
    if (s != null) 
    { 
     MemoryStream ms = s as MemoryStream; 
     Response.AddHeader("Content-Disposition", string.Format("attachment;filename=" + HttpUtility.UrlEncode(reportName) + DateTime.Now.ToString("yyyyMMdd") + ".xlsx")); 
     Response.ContentType = "application/vnd.ms-excel"; 
     Response.AddHeader("Content-Length", ms.ToArray().Length.ToString()); 
     Response.BinaryWrite(ms.ToArray()); 
     Response.Flush(); 
     ms.Close(); 
     ms.Dispose(); 
    } 
    else 
     Response.Write("Error!Connot Download"); 
}

我有二进制流，而不是MS-Excel文件。 PS：我真的想知道如何生成一个文件进行下载，也就是说，为什么你的代码工作，浏览器生成文件或服务器？

来源

2017-02-27 hashtabe_0

so ..你的代码不工作，或者你有一个问题吗？ – lordkain

@lordkain我的代码无效。如果你有代码的作品，我想知道它是如何工作:) –

youre使用经典的asp.net或MVC – lordkain

NPOI是一个辅助模块，用于创建四个excel文件。这是在服务器端和内存中创建的。（workbook.Write（ms）将excel文件写入内存）excel文件以字节[]的形式通过网络，浏览器根据文件和内容类型决定如何处理它。

当u使用经典的asp.net然后把一个链接在你的aspx页面像下面

<a target="_blank" href="Handler.ashx" >download...</a>

创建Handler.ashx并把代码FOM DownloadExcel成的ProcessRequest从Handler.ashx。

public void ProcessRequest (HttpContext context) 
{ 
    //create dumy data, or in youre case the data form somewhere else 
    DataTable table = new DataTable(); 
    table.Columns.AddRange(new[] 
     { 
      new DataColumn("Name") 
     }); 
    table.Rows.Add("david"); 
    table.Rows.Add("Ruud"); 

    // your code 
    Stream s = RenderDataTableToExcel(dt); 
    if (s != null) 
    { 
     MemoryStream ms = s as MemoryStream; 
     Response.AddHeader("Content-Disposition", string.Format("attachment;filename=" + HttpUtility.UrlEncode(reportName) + DateTime.Now.ToString("yyyyMMdd") + ".xlsx")); 
     Response.ContentType = "application/vnd.ms-excel"; 
     Response.AddHeader("Content-Length", ms.ToArray().Length.ToString()); 
     Response.BinaryWrite(ms.ToArray()); 
     Response.Flush(); 
     ms.Close(); 
     ms.Dispose(); 
    } 
    else 
     Response.Write("Error!Connot Download"); 
    } 
}

在MVC中就像下面这样。

[HttpGet] 
public ActionResult ExportToExcel(string reportName) 
{ 
    byte [] reportDocument = RenderDataTableToExcel().ToArray(); 

    Response.StatusCode = (int)HttpStatusCode.OK; 
    return File(reportDocument, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", reportName); 
}

来源

2017-02-27 12:30:03 lordkain

我已经将contenttype设置为“application/vnd.ms-excel”，但我仍然得到二进制流。 –

我用过ajax TVT。

window.location.href = "?action=DownloadAll"; 
    //$.ajax({ 
    // url: "?action=DownloadAll", 
    // type: "get", 
    // success: function() { } 
    //});

来源

2017-02-27 12:48:41

你可以把一个DataTable到Excel工作表有一些非常可读的代码：

XLWorkbook wb = new XLWorkbook(); 
DataTable dt = GetDataTableOrWhatever(); 
wb.Worksheets.Add(dt,"WorksheetName");

它将运行速度超快呢！

来源

2017-03-02 15:51:27 ryguy72

如何一个DataTable变量导出到EXCEL和下载Excel

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