directory

C# – Get all files in a folder

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There are two simple ways to get all files in a folder: I’ll show examples below, along with a few other scenarios, such as getting files from subfolders. Note: ‘directory’ and ‘folder’ mean the same thing. I use these terms interchangeably. Get all files with Directory.GetFiles() Directory.GetFiles() returns all file paths from the top-level folder … Read more

C# – Delete all files in a directory

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Use Directory.EnumerateFiles() to get the file paths in a directory. Then loop over the file paths and delete each file. Here’s an example: This deletes the root directory’s files without deleting the directory itself. I’ll show more examples. Delete all files with a specific extension Use Directory.EnumerateFiles’ searchPattern pattern to search for files with a … Read more

C# – How to make a file read-only

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There are two ways to programmatically make a file read-only: Here’s an example showing both ways to make a file read-only: Using File.SetAttributes() is useful when you want to manage all of file’s attributes at once. FileAttributes is an enum flag, so you can use bitwise operations to add/remove multiple attributes at once. That’s why … Read more

C# – How to create directories

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You can use Directory.CreateDirectory() to create a directory at the specified path (absolute or relative), like this: This creates the directory if it doesn’t exist, otherwise it does nothing. That means you don’t need to check if the directory exists before calling Directory.CreateDirectory(). In this article, I’ll go into more details about using Directory.CreateDirectory(). CreateDirectory() … Read more

C# – Search for files in a directory

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Use Directory.EnumerateFiles() to search for files in a directory and then loop over the file paths (and then reading the files, or whatever you want to do with the info). Here’s an example of searching for files containing “hello” in the file name: Note: Use the wildcard character * to match anything. It returns an … Read more

C# – How to update appsettings.json programmatically

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You have to overwrite the appsettings.json file to be able to update values programmatically. You have to deal with the whole file, not individual parts of it. The process can be summarized in the following steps: There are two options for deserialization. You can either 1) Deserialize appsettings.json into a dynamic object or 2) Load … Read more

C# – Check if a directory is empty

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The simplest way to check if a directory is empty is by calling Directory.EnumerateFileSystemEntries(). If this doesn’t return anything, then the directory doesn’t have any files or subdirectories (folders), which means it’s empty. Here’s an example: Another situation to consider is when a directory has no files but might have empty subdirectories (folders). You can … Read more