[英]How to remove export to excel warning when exporting datatable
我有以下代码,数据表已经有数据,我想将其导出到excel。 但是我收到以下警告,我尝试了xlsx,但它不起作用。 我也尝试了csv,并且数据没有按需要打开到列中。
public static void ExportDatatabletoExcel(DataTable dt, List<string> columnNames)
{
try
{
const string attachment = "attachment; filename=elreport.xls";
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.AddHeader("content-disposition", attachment);
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
if (!columnNames.Contains(dc.ColumnName)) continue;
HttpContext.Current.Response.Write(tab + dc.ColumnName);
tab = "\t";
}
HttpContext.Current.Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
tab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
if(!columnNames.Contains(dt.Columns[i].ColumnName)) continue;
HttpContext.Current.Response.Write(tab + dr[i].ToString());
tab = "\t";
}
HttpContext.Current.Response.Write("\n");
}
HttpContext.Current.Response.End();
}
catch (Exception ex)
{
string errorMessage = String.Format("ExportToExcelError: {0}", ex.Message);
LoggingService.LogError(LoggingCategory.General, ex, errorMessage);
throw;
}
}
错误是:
如何在Excel下载时抑制文件损坏警告的 答案 ? 解决了一些问题。 我建议也检查一些其他答案。
该警报是Excel 2007中的一项新的安全功能,称为扩展强化,可确保打开的文件内容与尝试打开文件的shell命令中指定的扩展名类型匹配。
...
这个问题仍在调查中,但是鉴于Office 14的代码复杂性,并且在不完全了解IE开放行为的情况下Excel不想降低安全措施来解决IE开放行为的事实,直到Office 14才可能解决此问题。对其他浏览器用户的后果。
此外, 此评论可能会有所帮助。
我认为这仅适用于使用CSV并另存为XLS的情况。 但是,如果您构建一个真正的excel文件,那应该没问题。 CF9 cfspreadsheet将成为您的朋友。 :) –亨利09年6月25日在23:53
其他要检查的资源:
有两种清除警告的肯定方法。
使用OpenXML API或EPPlus API构建有效的.xlsx文件(EPPlus更容易,并且实际上支持OleDB导入)
将文件构建为扩展名为.csv的.csv,但将内容类型保留为Excel,以便使用Excel打开。 但是,在构建文件的方式上,Excel可能无法正确读取内容,这需要解决:
如果以某些方式设置了格式,Excel只能读取CSV。 假设您使用Excel for Windows,编码也必须是Windows 1252,否则它将无法处理外来字符。 另外,邮政编码等中的前导零也需要专门针对Excel处理。
public static class CSVExportUtility
{
/// <summary>
/// Open a datatable in Excel
/// </summary>
/// <param name="dt"></param>
/// <param name="fileName"></param>
public static void OpenAsCSV(DataTable dt, string fileName)
{
CSVExportUtility.OpenAsCSV(DataTableToCSV(dt), fileName); // now open the file
} // OpenAsCSV
/// <summary>
/// open the content in the browser as a CSV
/// </summary>
/// <param name="sbCSVFileData"></param>
/// <param name="filename"></param>
public static void OpenAsCSV(StringBuilder sbCSVFileData, string fileName)
{
if (HttpContext.Current == null || HttpContext.Current.Response == null)
return;
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader(
"content-disposition", string.Format("attachment; filename={0}", fileName));
HttpContext.Current.Response.ContentType = "application/ms-excel";
// This is a little tricky. Would like to use utf-8 or unicode... but Excel on Windows uses 1252 by default so we need to keep the same so most users can read the file.
// At some point, we may need to actually convert our text from whatever .NET uses to 1252, but at the moment they seem similar enough that it is okay
HttpContext.Current.Response.ContentEncoding = Encoding.GetEncoding(1252);
// render the htmlwriter into the response
HttpContext.Current.Response.Write(sbCSVFileData.ToString());
HttpContext.Current.Response.End();
}
static StringBuilder DataTableToCSV(DataTable dt)
{
StringBuilder sb = new StringBuilder();
foreach (DataColumn dc in dt.Columns)
{
if (dc == dt.Columns[dt.Columns.Count - 1])
CSVExportUtility.AddFieldForCSV(dc.ColumnName, sb, false, true);
else
CSVExportUtility.AddFieldForCSV(dc.ColumnName, sb, true, false);
}
foreach (DataRow dr in dt.Rows)
{
foreach (DataColumn dc in dt.Columns)
{
if (dc == dt.Columns[dt.Columns.Count - 1])
CSVExportUtility.AddFieldForCSV(FormatDataValue(dr[dc.ColumnName]), sb, false, true);
else
CSVExportUtility.AddFieldForCSV(FormatDataValue(dr[dc.ColumnName]), sb, true, false);
}
}
return sb;
}
static string FormatDataValue(object dv)
{
if (dv == null)
return null;
if (dv is DateTime)
return ((DateTime)dv).ToShortDateString();
else
return dv.ToString();
}
/// <summary>
/// export text to a csv
/// </summary>
/// <param name="text"></param>
/// <param name="sbCSV"></param>
/// <param name="appendTrailingComma"></param>
/// <param name="endOfRow"></param>
public static void AddFieldForCSV(string text, StringBuilder sbCSV, bool appendTrailingComma, bool endOfRow)
{
// shouldn't start or end with whitespace, escape quotes
if (text != null)
text = text.Trim().Replace("\"", "\"\"");
// quote field
int testInt;
if (text != null && text.Trim().Length > 1 && text.Trim()[0] == '0' && int.TryParse(text.Trim(), out testInt))
{ // if text is numeric and starts with '0' tell excel to treat as string and not strip the zero. This ONLY works if it's numeric! Otherwise it fails, example ="a,b" will use 2 cells
text = "=\"" + text.Trim() + "\"";
}
else
{
text = "\"" + text + "\"";
}
sbCSV.Append(text);
if (appendTrailingComma)
sbCSV.Append(",");
if (endOfRow)
sbCSV.AppendLine();
}
}
如果您要导出GridView而不是DataTable,请访问以下说明: http : //atakala.com/Browser/Item.aspx? user_id=amos&dict_id= 2325 ; 许多代码是相似的(CSVExportUtility方法)
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