2017/10/15エディタテスト

2017/10/15： 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Reflection;
using System.IO;
using Excel = Microsoft.Office.Interop.Excel;
namespace Excel2
{
    public partial class Form1 : Form
    {
        string cruentPath = "";
        public Form1()
        {
            InitializeComponent();
            init();
        }
    private void button1_Click(object sender, EventArgs e)
    {
        WriteExcel(cruentPath + "\\results.xlsx");
    }

    private void init()
    {
         cruentPath = Directory.GetCurrentDirectory();
    }
    private void WriteExcel(string filename)
    {
        Excel.Application excelApp = new Excel.Application();
        if (excelApp == null)
        {
            MessageBox.Show(" Excel");
            return;
        }
        Excel.Workbook workbook;
        if (File.Exists(filename))
        {
            workbook = excelApp.Workbooks.Open(filename, 0, false, 5, "", "", true,
            Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
        }
        else
        {
            workbook = excelApp.Workbooks.Add(true);
        }
        Excel.Worksheet worksheet = workbook.ActiveSheet as Excel.Worksheet;
        worksheet = (Excel.Worksheet)workbook.Worksheets.get_Item(1);
        worksheet.Cells[1,1] = " ";
        worksheet.Cells[1, 2] = " 1";
        worksheet.Cells[1, 3] = " 2";
        worksheet.Cells[1, 4] = " 3";

        //worksheet.Cells[1, 2] = " ";

        excelApp.Visible = false;
        excelApp.DisplayAlerts = false;
        if (File.Exists(filename))
        {
            workbook.Save();
        }
        //workbook.SaveAs(filename);
        workbook.Close(false,Missing.Value,Missing.Value);

        excelApp.Quit();
        worksheet = null;
        workbook = null;
        excelApp = null;
        GC.Collect();

    }
}