Question

I have a Setup/Deployment Project for my Application and it outputs certain files (*.dll, *.dat) to the Application Folder.

I would like a condition to be set to check if a file currently exists or not. If it doesn’t, write it but if it does, don’t install it from the package. Is it possible?

The file is called “database.dat” and under the Properties, I see a “Condition” attribute, but I’m not familiar with what to put in there.

Any input is greatly appreciated. Thanks in advance.

Edit:

Reason why it would already exist is that from a previous install there would be data from a DataSet / Data Table which we don’t want to overwrite.

Answer 1

To only install a file, if it doesn’t already exist, follow these steps:

1. Add a “Search Target Machine” entry under the “Launch Conditions” view in your setup project.

2. fill in the FileName property and the Folder property.

3. the Property property should be a constant you can remember, like “MY_AWESOME_FILE_EXISTS“
4. in the “File System” view of your project, locate the component to install and add this to the Condition property “not MY_AWESOME_FILE_EXISTS“

That is all.

Sources (since I just had to figure this out for myself):

• Condition Property
• Conditional Statement Syntax
• Conditional Install if a file exists
• Searching for Existing Applications, Files, Registry Entries or .ini File Entries