Last file time in C#

Question

2.33/5 (2 votes)

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i try to get time of file. scanerio is when any last file is saved in folder i want that file date time in console
i try this

What I have tried:

C#

public static void Main()
        {
            try 
            {
                string path = @"C:\Users\Administrator\Desktop\New folder\DB.txt";
                if(!File.Exists(path))
                {
                    File.Create(path);
                }
                else
                {
                    File.SetLastWriteTime(path, new DateTime());
                }
                DateTime dt = File.GetLastWriteTime(path);
                Console.WriteLine("the last time {0}", dt);
                Console.ReadLine();
            }
            catch (Exception e)
            {
                Console.WriteLine("The process failed: {0}", e.ToString());
            }

        }

but this shows error
Not a valid Win32 FileTime.
any solution

Posted 9-May-16 23:22pm

super_user

Updated 9-May-16 23:32pm

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Comments

Sinisa Hajnal 10-May-16 5:29am

Use Now() function instead of new DateTime...if that doesn't work, check the documentation on Win32 file time and see which formats are supported.

Suvendu Shekhar Giri 10-May-16 5:33am

Now is a property of DateTime class, it's not a function or method.
Ref: DateTime.Now Property (System)[^]

Sergey Alexandrovich Kryukov 10-May-16 9:14am

In what line?

There are no situations when hard-code path name can be useful. In your case, the path you are using may not exist, or not accessible to your application. The whole idea is wrong. What are you trying to achieve?

Now, look what you are doing. Do you really want to set file time and then immediately read it. Why?

—SA

Philippe Mori 10-May-16 12:30pm

The system automatically handle file creation and last modification date.

Thus in most cases, it make no sense to change either time.

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Suvendu Shekhar Giri · Answer 1 · 2016-05-09T23:32:00

Solution 1

What you want to achieve through following line of code?

C#

File.SetLastWriteTime(path, new DateTime());

If you want to set current datetime as LastWriteTime, try following-

C#

File.SetLastWriteTime(path, DateTime.Now);

If you still experience the same error or if your requirement is something else, please let me know.
:)

Posted 9-May-16 23:32pm

Suvendu Shekhar Giri

Comments

super_user 10-May-16 5:41am

i dont want current date time .. i want the time when file is created / modified in folder

Suvendu Shekhar Giri 10-May-16 5:45am

..and that didn't answer my question, what is the use of following line-
File.SetLastWriteTime(path, new DateTime());
Please explain.

super_user 10-May-16 5:47am

through this line i try to show date time when the file is created/modified

Suvendu Shekhar Giri 10-May-16 5:57am

Then I would suggest to try commenting following lines of code and see if that helps-
//else
// {
// File.SetLastWriteTime(path, new DateTime());
// }

super_user 10-May-16 6:22am

ok if i create any new file in new folder .and i want that file date time then what i can do .. i also remove db.txt from path then when i create new file in folder and then i run to display date time then this shows error Access to the path 'C:\Users\Administrator\Desktop\New folder' is denied.

Sergey Alexandrovich Kryukov 10-May-16 9:20am

Who told you this file can be accessible? The whole idea is wrong.
—SA

Suvendu Shekhar Giri 10-May-16 9:40am

Hi Sergey !
Am I missing something very basic here?
Can you please educate me a bit more on this?
Thanks in advance !

Sergey Alexandrovich Kryukov 10-May-16 9:52am

Just look at the path and my comment to the question. Isn't it obvious that this path is not designed to be accessed by everyone? If you have some concerns, please ask me what is not clear.
The real problem that the inquirer not just doing something weird, but probably does not understand what he wants to achieve.
—SA

Suvendu Shekhar Giri 10-May-16 9:56am

Yes. Noted. Completely agree.

super_user,
Can you please let us know what exactly your requirement is, irrespective of the code you have shared here?

Sergey Alexandrovich Kryukov 10-May-16 10:01am

Our inquirer might fail to understand the addressing "@OP:"; hope you don't mind I edited it...
—SA

Suvendu Shekhar Giri 10-May-16 10:04am

:P True. Agree. Thanks :)

Sergey Alexandrovich Kryukov 10-May-16 9:53am

Anyway, the civilized approach is not to dig into user accounts, privileges, elevation and file system permissions, but simply not to touch the paths not designed to be touched.
—SA

super_user 11-May-16 1:00am

actually i want to achieve that when someone create a new file in new folder then i want that modified date time to check when new file is created in this folder.. hope u understand

Suvendu Shekhar Giri 11-May-16 2:09am

How that "someone" will have access to your desktop within Administrator a/c?

super_user 11-May-16 2:12am

THIS is test so firstly i want to check