UWP Check If File Exists

UWP Check If File Exists

You can check if a file exists in a Universal Windows Platform (UWP) app using the StorageFile class. Here's an example:

string fileName = "example.txt";
StorageFolder folder = ApplicationData.Current.LocalFolder;

if (await folder.TryGetItemAsync(fileName) != null)
{
    // The file exists
}
else
{
    // The file does not exist
}

In this example, we're defining a string variable fileName with the name of the file we want to check for. We're then getting a reference to the app's local storage folder using the ApplicationData.Current.LocalFolder property.

We're then calling the TryGetItemAsync method on the folder object, passing in the fileName string as input. This method returns a StorageItem object that represents the file if it exists in the folder, or null if the file does not exist.

We're then using the != operator to check if the returned StorageItem object is not null. If it is not null, we know that the file exists in the folder. If it is null, we know that the file does not exist.

Note that you need to use the await keyword when calling the TryGetItemAsync method, as it is an asynchronous method that returns a Task.

Examples

  1. UWP check if file exists using StorageFile.GetFileFromPathAsync

    • Description: This query involves checking if a file exists in UWP using the StorageFile.GetFileFromPathAsync method.
    async Task<bool> CheckFileExistsAsync(string filePath)
{
    try
    {
        StorageFile file = await StorageFile.GetFileFromPathAsync(filePath);
        return file != null;
    }
    catch (FileNotFoundException)
    {
        return false;
    }
}

  2. UWP check if file exists using StorageFile.TryGetItemAsync

    • Description: This method uses StorageFile.TryGetItemAsync to check if a file exists in UWP.
    async Task<bool> CheckFileExistsAsync(string filePath)
{
    StorageFile file = await StorageFile.GetFileFromPathAsync(filePath);
    return file != null;
}

  3. UWP check if file exists with StorageFolder.GetFileAsync

    • Description: In this approach, we utilize StorageFolder.GetFileAsync to verify if a file exists in UWP.
    async Task<bool> CheckFileExistsAsync(StorageFolder folder, string fileName)
{
    try
    {
        StorageFile file = await folder.GetFileAsync(fileName);
        return true;
    }
    catch (FileNotFoundException)
    {
        return false;
    }
}

  4. UWP check if file exists using FileIO

    • Description: This method checks file existence using FileIO class in UWP.
    async Task<bool> CheckFileExistsAsync(string filePath)
{
    try
    {
        await FileIO.ReadBufferAsync(filePath);
        return true;
    }
    catch (FileNotFoundException)
    {
        return false;
    }
}

  5. UWP check if file exists using StorageFile.GetFileFromApplicationUriAsync

    • Description: Here, we utilize StorageFile.GetFileFromApplicationUriAsync to check if a file exists in UWP.
    async Task<bool> CheckFileExistsAsync(Uri uri)
{
    try
    {
        StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(uri);
        return file != null;
    }
    catch (FileNotFoundException)
    {
        return false;
    }
}

  6. UWP check if file exists with File.Exists method

    • Description: Although not the recommended approach in UWP, you can still use File.Exists from System.IO namespace with limitations.
    bool CheckFileExists(string filePath)
{
    return File.Exists(filePath);
}

  7. UWP check if file exists using StorageFolder.GetFilesAsync

    • Description: This method checks if a file exists within a folder using StorageFolder.GetFilesAsync.
    async Task<bool> CheckFileExistsAsync(StorageFolder folder, string fileName)
{
    var files = await folder.GetFilesAsync();
    return files.Any(f => f.Name == fileName);
}

  8. UWP check if file exists with StorageFolder.TryGetItemAsync

    • Description: This method utilizes StorageFolder.TryGetItemAsync to determine if a file exists in UWP.
    async Task<bool> CheckFileExistsAsync(StorageFolder folder, string fileName)
{
    IStorageItem item = await folder.TryGetItemAsync(fileName);
    return item != null;
}

  9. UWP check if file exists using File.Exists from Windows.Storage

    • Description: Similar to System.IO's File.Exists, UWP provides a version in Windows.Storage namespace.
    async Task<bool> CheckFileExistsAsync(string filePath)
{
    return Windows.Storage.StorageFile.Exists(filePath);
}

  10. UWP check if file exists with StorageFile.GetFileFromApplicationUriAsync

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