Develop Reference

Excel to Image without api in C#.Net

I am having a linux machine and want system drawing to convert a excel table to image for Free.
Here is my code
using GrapeCity.Documents.Excel;
using System;
using System.Drawing;
using System.IO;
class Program
{
static void Main()
{
//Create a new workbook
var workbook = new GrapeCity.Documents.Excel.Workbook();
Console.WriteLine("Working...");
FileStream fileStream = new FileStream("Test121.xlsx", FileMode.Open);
//Open a xlsx file
workbook.Open(fileStream);
IWorksheet worksheet = workbook.Worksheets[0];
//Export the worksheet to image
worksheet.ToImage("Test121.png");
Console.WriteLine("Done!!");
}
}
but this gives a warning at top of image that it is unlicensed
I also could not use Spire.XLS as my excel file could have more than 200 rows.
btw i am using C#.Net on my ubuntu 20.04 LTS

Close Excel in C# after the saving the file

I am using C# to write some information to an Excel file:
using System;
using System.IO;
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.Diagnostics;
using Microsoft.Office.Interop.Excel;
using Excel = Microsoft.Office.Interop.Excel;
using System.Globalization;
public void OpenExcel(string folder, string filename)
{
this.folder = folder;
this.filename = filename;
path = folder + #"\" + filename;
if (File.Exists(path) != true) //if the output file does not exists, create it
{
var app = new Microsoft.Office.Interop.Excel.Application();
var temp = app.Workbooks.Add();
temp.SaveAs(path);
temp.Close();
}
wb = excel.Workbooks.Open(path);
}
After I am done and have saved the file, I want to close it:
public void Close()
{
wb.Close(false);
excel.Quit();
excel.Application.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(workSheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(wb);
System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
workSheet = null;
wb = null;
excel = null;
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
}
Both of the voids above are part of a class object named ExcelFile. However, when I use the code above and exit the program I have made, Excel still is left as a background process like in this question: C# closing Excel after using
I have seen that there are a few threads on stackoverflow on this topic, but no solution seems to work for me. I want to avoid killing all Excel processes if possible since this is a program that will make calculations using thread pool that will take hours to make.

How to copy an excel sheet from workbook A to workbook B

I have the below code to copy Sheet1 from a workbook (test1.xlsx) to another workbook (test2.xlsx). The code doesn't have any errors and it takes forever to execute and I had to stop the code with no change in the files. Please let me know what is wrong.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Excel = Microsoft.Office.Interop.Excel;
namespace Read_from_Excel_file
{
class Program
{
static void Main(string[] args)
{
Excel.Application xlApp = new Excel.Application();
Excel.Workbook test1 = xlApp.Workbooks.Open(#"C:\Users\namokhtar\Desktop\test1.xlsx");
Excel.Workbook test2 = xlApp.Workbooks.Open(#"C:\Users\namokhtar\Desktop\test2.xlsx");
test2.Worksheets.Copy(test1.Worksheets["Sheet1"]);
test2.Save();
test1.Close();
test2.Close();
xlApp.Quit();
}
}
}

I think you need to specify where to copy the worksheet to. So at line
test2.Worksheets.Copy(test1.Worksheets["Sheet1"]);
you have to specify which worksheet in test2 you want to copy the worksheet in. test2.Worksheets["whateverworksheetyouwanttooverwrite"].Copy(test1.Worksheets["Sheet1"]);
Source: (https://learn.microsoft.com/nl-nl/visualstudio/vsto/how-to-programmatically-copy-worksheets?view=vs-2017)

Enable to read cell value from Excel to C# while

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Excel;
using System.Data.OleDb;
namespace EXCEL_SMS
{
class Program
{
static void Main(string[] args)
{
string path = "C:\\Projects\\ExcelSingleValue\\Test.xlsx ";
Application excel = new Application();
Workbook wb = excel.Workbooks.Open(path);
Worksheet excelSheet = wb.Activesheet;
// Read the first cell
string test = excelSheet.Cells[1, 1].Value.ToString();
// string sValue = (range.Cells[2, 4] as Microsoft.Office.Interop.Excel.Range).Value2.ToString();
wb.Close();
}
}
}
I am getting error at activesheet, I want read cell value from Excel while it's open. Can anyone tell how I can achieve it? I'm using Visual Studio 2012.

there is a mistake in "ActiveSheet" please correct it will work fine, in your code it is "Activesheet" ('s' is a small need to be Capital 'S')
Worksheet excelSheet = wb.ActiveSheet; //wb.Activesheet;
Please see the result I am getting with the same program as below, I am able to get the first Cell from test.xlsx

Creating Excel Spreadsheet - Library Reference issue

I am attempting to create an Excel spreadsheet in C#. I am using VSE 2010. I added a project reference to
Microsoft Excel 14.0 Object Library
and my using statements include
using Microsoft.Office.Interop.Excel;
however, this code gives an error "the type or namespace could not be found" for all the Excel. statements.
Is there anything else I need to be doing?
class excelsheet
{
private static void CreateWorkbook(string FileName)
{
Excel.Application xl = null;
Excel._Workbook wb = null;
Excel._Worksheet sheet = null;
//VBIDE.VBComponent module = null;
bool SaveChanges = false;
}
}

I'm assuming you are doing this:
using Microsoft.Office.Interop.Excel;
Instead, try changing it to a using statement like:
using Excel = Microsoft.Office.Interop.Excel;