How to work C# File.Copy method if source and destination is same

Question

How to work C# File.Copy method if source and destination is same

Z.lee 1

I want to know how to work File.Copy method in C# when Source and Destination file is same.
I mean, In case of Source and Destination file's name and modified date is same.

Because, When I copied files, the compeleted time is different between case 1 and case 2.
( case 1 : Source and Destination files are same name, but different modified date. )
( case 2 : Source and Destination files are same name and also have same modified date.)

So, I want to know, Why the completed time is different between that two cases?

Thanks.

Karen Payne MVP 35,586 Reputation points Volunteer Moderator

2021-11-22T12:11:16.56+00:00

That is what the operating system is doing, not .NET Code, C# code has nothing to do with differences in date/time stamps.
Ken Tucker 5,861 Reputation points

2021-11-22T12:22:41.647+00:00

Are you using the file.copy with the boolean overwrite? Wondering if the file size, name, and modified date are same if file is copied if overwrite is not set?
Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2021-11-23T07:50:56.603+00:00
Hi @Z.lee ,
I make a test based on your description but I can not reproduce your problem.
Here is the code.

string OrignFile = "OriginPath\file.txt"; string NewFile = "NewPath\file.txt"; File.Copy(OrignFile, NewFile, true);

In my test, they always have same modified date.

case 1 : Source and Destination files are same name, but different modified date.

Would you please provide more details about this sentence?

Your answer

Karen Payne MVP 35,586 Reputation points Volunteer Moderator

2021-11-22T12:11:16.56+00:00

That is what the operating system is doing, not .NET Code, C# code has nothing to do with differences in date/time stamps.
Ken Tucker 5,861 Reputation points

2021-11-22T12:22:41.647+00:00

Are you using the file.copy with the boolean overwrite? Wondering if the file size, name, and modified date are same if file is copied if overwrite is not set?
Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2021-11-23T07:50:56.603+00:00

Hi @Z.lee ,
I make a test based on your description but I can not reproduce your problem.
Here is the code.

string OrignFile = "OriginPath\file.txt"; string NewFile = "NewPath\file.txt"; File.Copy(OrignFile, NewFile, true);

In my test, they always have same modified date.

case 1 : Source and Destination files are same name, but different modified date.

Would you please provide more details about this sentence?

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How to work C# File.Copy method if source and destination is same

Your answer