C++/CLI使用Office.Interop库创建excel，同时解决写入速度慢的问题

bool WriteExcelFile_OfficeInterop(String^ path, DataSet^ dt,
		const std::vector<std::string>& sheetName, bool hideColumnName)
	{
		// If the file already exists, delete it and then generate file
		if (System::IO::File::Exists(path))
		{
			try
			{
				System::IO::File::Delete(path);
			}
			catch (System::Exception^ e)
			{
				System::Windows::Forms::MessageBox::Show("Delete Excel File Failed, Please Check File Statue.",
					"Delete File Error",
					System::Windows::Forms::MessageBoxButtons::OK,
					System::Windows::Forms::MessageBoxIcon::Error);
				return false;
			}
		}

		Excel::Application^ excelApp = nullptr;
		Excel::_Workbook^ workbook = nullptr;
		Excel::Worksheet^ worksheet = nullptr;
		Excel::Range^ range = nullptr;
		Excel::Range^ firstRow = nullptr;
		Excel::Sort^ sort = nullptr;
		bool ret = true;
		try
		{
			//Create a new instance of Excel application
			excelApp = gcnew Excel::ApplicationClass();
			//Create a new workbook
			workbook = excelApp->Workbooks->Add(true);

			for (int i = 0; i < dt->Tables->Count; ++i)
			{
				//Create a new worksheet
				worksheet = (Excel::Worksheet^)workbook->Sheets->Add(Type::Missing, workbook->Sheets[workbook->Worksheets->Count], Type::Missing, Excel::XlSheetType::xlWorksheet);
				//Set the name of the worksheet
				worksheet->Name = StringToSystemString(sheetName[i]);

				// headerRowIndex == 0 means that header is hid
				int headerRowIndex = 0;
				if (hideColumnName == false)
				{
					// the header will occupy 1 row
					headerRowIndex = 1;
					//Fill the header row with column names
					for (int j = 0; j < dt->Tables[i]->Columns->Count; ++j)
					{
						worksheet->Cells[1, j + 1] = dt->Tables[i]->Columns[j]->ColumnName;
					}
				}

				//Fill the data rows using range object
				int numCols = dt->Tables[i]->Columns->Count;
				int numRows = dt->Tables[i]->Rows->Count;
				range = worksheet->Range[worksheet->Cells[headerRowIndex + 1, 1], 
										 worksheet->Cells[headerRowIndex + numRows, numCols]];

				// 使用二维数组加速写入
				array<System::Object^, 2>^ dataArray = gcnew array<System::Object^, 2>(numRows, numCols);
				for (int row = 0; row < numRows; ++row)
				{
					for (int col = 0; col < numCols; ++col)
					{
						dataArray[row, col] = dt->Tables[i]->Rows->default[row]->default[col];
					}
				}
				range->Value2 = dataArray;
				
				// UsedRange : not empty column
				worksheet->UsedRange->Columns->AutoFit();
			}
			// delete default empty sheet which is created when create a workbook
			safe_cast<Excel::Worksheet^>(workbook->Sheets["Sheet1"])->Delete();
			// select the first sheet
			safe_cast<Excel::_Worksheet^>(workbook->Sheets[1])->Activate();
			//Save the workbook
			workbook->SaveAs(path, Type::Missing, Type::Missing,
				Type::Missing, Type::Missing, Type::Missing, Microsoft::Office::Interop::Excel::XlSaveAsAccessMode::xlNoChange,
				Type::Missing, Type::Missing, Type::Missing, Type::Missing, Type::Missing);

			//Close the workbook
			workbook->Close(Type::Missing, Type::Missing, Type::Missing);

			//Quit the Excel application
			excelApp->Quit();
		}
		catch (System::Exception^ e)
		{
			System::Windows::Forms::MessageBox::Show(e->Message,
				"Write File Error",
				System::Windows::Forms::MessageBoxButtons::OK,
				System::Windows::Forms::MessageBoxIcon::Error);

			//Close the workbook and quit the Excel application
			if (workbook != nullptr)
			{
				workbook->Close(Type::Missing, Type::Missing, Type::Missing);
			}
			if (excelApp != nullptr)
			{
				excelApp->Quit();
			}
			ret = false;
		}
		finally
		{
			//Release COM objects
			if (sort != nullptr)
			{
				Marshal::ReleaseComObject(sort);
			}
			if (firstRow != nullptr)
			{
				Marshal::ReleaseComObject(firstRow);
			}
			if (range != nullptr)
			{
				Marshal::ReleaseComObject(range);
			}

			if (worksheet != nullptr)
			{
				Marshal::ReleaseComObject(worksheet);
			}
			if (workbook != nullptr)
			{
				Marshal::ReleaseComObject(workbook);
			}
			if (excelApp != nullptr)
			{
				Marshal::ReleaseComObject(excelApp);
			}
		}
		return ret;
	}