How to read open excel file at C#

Question

I want to read already open excel file with C#. I am using this method but it can\'t read the excel file while the file is open in Microsoft excel.

FileStre         


        

Answer 1

I think you can still copy the file while excel has it open, so you could make a copy of the file and then open that. Just make sure you clean up after yourself when you are done with the copy.

Answer 2

You need to open it with FileShare.ReadWrite:

FileStream stream = File.Open("myfile.xlsx", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

See this answer.

Answer 3

To ensure that correct opening and closing of the file please look at using the c# using statements

using (FileStream stream = File.Open("myfile.xlsx", FileMode.Open, FileAccess.Read)) 
{

}

Answer 4

You could use the Interop library to use the already opened instance of Excel.

oExcel == (Excel.Application) System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application")

Answer 5

You can try the File.Open with a fourth parameter - fileShare.

FileStream stream = File.Open("myfile.xlsx", FileMode.Open, FileAccess.Read, FileShare.Read);

You may need to specify write access also.

Answer 6

To open the same file more than once at the same time, it needs to be opened in shared mode.

Hope this may help others.