title: How to know whether the specified path refers to an existing file?
body: <p>My current method is getting the top-level files in the current folder, and then check if has the file with the specified file name:</p>
  
  <pre><code>public async Task&lt;bool&gt; FileExists(StorageFolder folder, string fileName)
  {
      IReadOnlyList&lt;StorageFile&gt; fileList = await folder.GetFilesAsync();
      StorageFile existFile = fileList.First(x =&gt; x.Name == fileName);
      return (existFile != null);
  }
  </code></pre>
  
  <p>Is there have easily and efficiently way to do that?</p>