UWP StrorageFileGetFilePathAsync()

Question

HI, I am trying to figure out how I run this synch

private async Task ReadPtFileAsync( )
{
string path = @"c:\Users\pryan\OneDrive\MUA_Data\Patients.json";
var file = await StorageFile.GetFileFromPathAsync(path);
json = await FileIO.ReadTextAsync(file);
pts.PtList = JsonConvert.DeserializeObject<List<Patient>>(json);
}

thanks for the help

Answer 1

Try with

var file = StorageFile.GetFileFromPathAsync(path).GetAwaiter().GetResult();
string json = FileIO.ReadTextAsync(file).GetAwaiter().GetResult();

Answer 2

The StorageFile API can only reads/writes the files in some specific folders, like LocalState, PictureLibrary, etc. Please see the document here: https://learn.microsoft.com/en-us/windows/uwp/files/file-access-permissions

If you want to read files out of these folders, you need to declare the broadFileSystemAccess capability in the app manifest or call the file picker.

Example:

<Package  
  ...  
  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"  
  IgnorableNamespaces="uap mp rescap">  
...  
<Capabilities>  
    <rescap:Capability Name="broadFileSystemAccess" />  
</Capabilities>  

From your code, I guess you are trying to read the files in OneDrive so you may need more permissions for this folder.

You could use a try-catch block to wrapper your code and see if there are any exceptions.