问题：想要从数据表中生成Excel。 使用OfficeOpenXml.ExcelPackage创建Workbook.Worksheet并使用GetAsByteArray将其写入Excel。
相同的代码适用于较少的行Eg。当我在实时服务器上应用它作为从表中选择前6000 *然后它正在工作，但如果我把它作为select * from table然后它抛出下面提到的异常。
protected void FillExcel(DataTable table)
{
try
{
if (table.Rows.Count > 0 && table != null)
{
using (OfficeOpenXml.ExcelPackage pck = new OfficeOpenXml.ExcelPackage())
{
OfficeOpenXml.ExcelWorksheet ws;
ws = pck.Workbook.Worksheets.Add("excelname_XYZ");
//worksheet name
int ColumnIndex = 0; //FillExcelData
foreach (DataColumn col in table.Columns) //FillExcelData column
{
ColumnIndex++;
ws.Cells[1, ColumnIndex].Value = col.ColumnName;
}
int rowIndex = 0;
foreach (DataRow row in table.Rows) //FillExcelData rows
{
rowIndex++;
ColumnIndex = 0;
foreach (DataColumn col in table.Columns)
{
ColumnIndex++;
ws.Cells[rowIndex + 1, ColumnIndex].Value = row[col.ColumnName].ToString();
}
}
ColumnIndex = 0;
foreach (DataColumn col in table.Columns)
{
ColumnIndex++;
ws.Cells[1, ColumnIndex].Style.Font.Bold = true;
ws.Cells[1, ColumnIndex].Style.Fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
ws.Cells[1, ColumnIndex].Style.Font.Color.SetColor(System.Drawing.Color.White);
ws.Cells[1, ColumnIndex].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.FromArgb(31, 73, 124));
}
using (OfficeOpenXml.ExcelRange x = ws.Cells["A:AH"])
{
x.AutoFitColumns();
}
Byte[] fileBytes = pck.GetAsByteArray();
//Clear the response
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.Cookies.Clear();
//Add the header & other information
Response.Cache.SetCacheability(HttpCacheability.Private);
Response.CacheControl = "private";
Response.Charset = System.Text.UTF8Encoding.UTF8.WebName;
Response.ContentEncoding = System.Text.UTF8Encoding.UTF8;
Response.AppendHeader("Content-Length", fileBytes.Length.ToString());
Response.AppendHeader("Pragma", "cache");
Response.AppendHeader("Expires", "60");
string strFilename = "fileName_" + DateTime.Now.ToString("MMM").Trim() + ".xlsx";
Response.AppendHeader("Content-Disposition",
"attachment; " +
"filename=\"" + strFilename + ".xlsx\"; " + //filename of excel
"size=" + fileBytes.Length.ToString());
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
//Write it back to the client
Response.BinaryWrite(fileBytes);
}
}
else
{
ScriptManager.RegisterStartupScript(this, typeof(Page), UniqueID, "alert('No Data Found for a specified date range.');", true);
}
}
catch (Exception ex)
{
Response.Write(ex.ToString());
}
}
异常发生在GetAsByteArray（）方法：//
System.Security.SecurityException: Request for the permission of type
'System.Security.Permissions.IsolatedStorageFilePermission, mscorlib,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
at System.Security.CodeAccessSecurityEngine.Check(Object demand,
StackCrawlMark& stackMark, Boolean isPermSet) at
System.Security.CodeAccessPermission.Demand()
atSystem.IO.IsolatedStorage.IsolatedStorage.DemandPermission
(IsolatedStorageScope scope) at
System.IO.IsolatedStorage.IsolatedStorage._InitStore(IsolatedStorageScope
scope, Evidence domainEv, Type domainEvidenceType, Evidence assemEv, Type
assemblyEvidenceType, Evidence appEv, Type appEvidenceType) at
System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope
scope, Type domainEvidenceType, Type assemblyEvidenceType) at
System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedStorageScope
scope, Type domainEvidenceType, Type assemblyEvidenceType) at
MS.Internal.IO.Packaging.PackagingUtilities.ReliableIsolatedStorageFileFolder.
.ctor() at
MS.Internal.IO.Packaging.PackagingUtilities.GetDefaultIsolatedStorageFile()
at
MS.Internal.IO.Packaging.PackagingUtilities.
CreateUserScopedIsolatedStorageFileStreamWithRandomName(Int32 retryCount,
String& fileName) at
MS.Internal.IO.Packaging.SparseMemoryStream.EnsureIsolatedStoreStream() at
MS.Internal.IO.Packaging.SparseMemoryStream.SwitchModeIfNecessary() at
MS.Internal.IO.Packaging.CompressEmulationStream.Write(Byte[] buffer, Int32
offset, Int32 count) at MS.Internal.IO.Packaging.CompressStream.Write
(Byte [] buffer, Int32 offset, Int32 count) at
MS.Internal.IO.Zip.ProgressiveCrcCalculatingStream.Write(Byte[] buffer,
Int32 offset, Int32 count) at
MS.Internal.IO.Zip.ZipIOModeEnforcingStream.Write(Byte[] buffer, Int32
offset, Int32 count) at System.IO.StreamWriter.Flush(Boolean flushStream,
Boolean flushEncoder) at System.IO.StreamWriter.Write(String value) at
OfficeOpenXml.ExcelWorksheet.UpdateRowCellData(StreamWriter sw) at
OfficeOpenXml.ExcelWorksheet.SaveXml() at OfficeOpenXml.ExcelWorksheet.
Save() at OfficeOpenXml.ExcelWorkbook.Save() at
OfficeOpenXml.ExcelPackage.GetAsByteArray(Boolean save) at
ASP._3709a01c_9c4c_425e_a710_10d1095ce4ca_1735241207.FillExcel(DataTable
table) in http://server/sitename/Report_Testing.aspx:line 125
The action that failed was: Demand The type of the first permission that
failed was: System.Security.Permissions.IsolatedStorageFilePermission The
first permission that failed was: The demand was for: The granted set of
the failing assembly was: The assembly or AppDomain that failed was:
EPPlus, Version=2.9.0.1, Culture=neutral, PublicKeyToken=ea159fdaa78159a1
The method that caused the failure was: Void UpdateRowCellData
(System.IO.StreamWriter) The Zone of the assembly that failed was:
MyComputer The Url of the assembly that failed was:
file:///C:/inetpub/wwwroot/wss/VirtualDirectories/2236/bin/EPPlus.DLL