Retreived properties for StorageFile are empty in some cases

Question

I am reading some properties of a given file in order to know its location on One Drive. For that I use the following code:

var file = await StorageFile.GetFileFromPathAsync(path);

            var props = await file?.Properties.RetrievePropertiesAsync(new[]
            {
                "System.FolderNameDisplay",
                "System.StorageProviderFileRemoteUri",
                "System.StorageProviderId"
            });

On most machines this yields a result when tested against a cloud service sync file (One Drive). The StorageProviderFileRemoteUri is an http url pointing to the online location. On some machines however the result is an empty string. Does anyone have any idea what might cause this. Things I did:

• Make sure the windows version is supported
• Target framework is set to net6.0-windows10.0.19041.0
• The path is actually a local one drive path

Answer 1

Hi @Peter Bons ,

Update: Upgrading the system from 10.0.22000.0 to 10.0.22621.0 fixed the issue.

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The error you said did not appear. But after I added the microsoft.windows.sdk.net.ref in your file, I can use StorageFile. If you want to use a similar approach in winform .net 6.0 to the project you have already created. You can take a look at my code below: I start it with a button and type the output into a richtextbox.

private async void button1_Click(object sender, EventArgs e)
{
    var path = @"C:\Users\Administrator\OneDrive\OneDrive.pdf"; 
    if (string.IsNullOrWhiteSpace(path) || !File.Exists(path))
    {
        richTextBox1.AppendText("Provide a valid path pointing to a file on OneDrive folder\nFor Example: C:\\Users\\pbons\\OneDrive - Brink\test.txt\n");
        return;
    }

    var file = await StorageFile.GetFileFromPathAsync(path);

    var props = await file?.Properties.RetrievePropertiesAsync(new[]
    {
        "System.FolderNameDisplay",
        "System.StorageProviderFileRemoteUri",
        "System.StorageProviderId"
    });

    foreach (var prop in props)
        richTextBox1.AppendText($"{prop.Key}: {prop.Value}\n");

    richTextBox1.AppendText($"DotNet version: {Environment.Version}\n");
    richTextBox1.AppendText($"OS version: {Environment.OSVersion}\n");
}

Best Regards,

Jiale

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