C# How to convert Excel to PDF

PS: There is a super big job in the company's business to convert OFFICE documents into PDF. I guess there were no programmers before, and those people in the company should have manually transferred them one by one. I strongly sigh for the apes that I have done so many things for you, and I am still complaining... I cannot meet your needs;

The Microsoft Net platform provides very good support for Office documents; among them, there are com components directly integrated into VS. Using these APIs can quickly eliminate many tedious tasks;

The following codes are written out after reading the company's code; the code is presented:

using System;
using ;
using ;
using ;
using ;
using ;
using ;
//Office namespacenamespace OfficeToPdf
{
  //Excel class  class ExcelConverter
  {
    //Constructor    public ExcelConverter()
    { }
    /// &lt;summary&gt;
    /// Convert excel to PDF document    /// &lt;/summary&gt;
    /// <param name="_lstrInputFile">origin file path</param>    /// <param name="_lstrOutFile">pdf file output path</param>    /// <returns>true Success</returns>    public bool ConverterToPdf(string _lstrInputFile,string _lstrOutFile)
    {
       lobjExcelApp = null;      
       lobjExcelWorkBooks = null;
       lobjExcelWorkBook = null;
      string lstrTemp = ;
      object lobjMissing = ;
      try
      {
        lobjExcelApp = new ();
         = true;
        lobjExcelWorkBooks = ;
        lobjExcelWorkBook = (_lstrInputFile, true, true, lobjMissing, lobjMissing, lobjMissing, true,
          lobjMissing, lobjMissing, lobjMissing, lobjMissing, lobjMissing, false, lobjMissing, lobjMissing);
        // This function will not be available after 12.0.0.0        lstrTemp = () + ().ToString() + ".xls" + ( ? 'm' : 'x');
        //lstrTemp = () + ().ToString() + ".xls";
        (lstrTemp, .xlExcel4Workbook, , , , false, , ,
          false, , , );
        //The output is PDF. The first option specifies that it is transferred to PDF, and can also be specified as XPS format.        (, _lstrOutFile, , , false, , , false, );
        ();
        ();
      }
      catch (Exception ex)
      {
        //Other log operations;        return false;
      }
      finally {
        if (lobjExcelWorkBook != null)
        {
          (,,);
          (lobjExcelWorkBook);
          lobjExcelWorkBook = null;
        }
        if(lobjExcelWorkBooks != null)
        {
          ();
          (lobjExcelWorkBooks);
          lobjExcelWorkBooks = null;
        }
        if(lobjExcelApp != null)
        {
          ();
          (lobjExcelApp);
          lobjExcelApp = null;
        } 
        //Actively activate the garbage collector, mainly to avoid excessive memory usage when converting documents in large quantities, and the garbage collector is not running all the time!        ();
        ();
      }
      return true;
    }
  }
}

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