void HandleDirectoryAutoCompleteBoxPopulating(object sender, PopulatingEventArgs e)
{
var autoCompleteBox = (AutoCompleteBox)sender;
string text = autoCompleteBox.Text;
string[] subDirectories = Array.Empty <string>();
if (!string.IsNullOrWhiteSpace(text))
{
string?directoryName = Path.GetDirectoryName(text);
if (DirectoryUtil.ExistsOrNullIfTimeout(directoryName ?? text, TimeSpan.FromSeconds(2)) ?? false)
{
try
{
subDirectories = Directory.GetDirectories(
directoryName ?? text,
"*",
SearchOption.TopDirectoryOnly);
}
catch
{
// ignore
}
}
}
autoCompleteBox.ItemsSource = subDirectories;
autoCompleteBox.PopulateComplete();
}
protected override ValidationResult?IsValid(object?value, ValidationContext validationContext)
{
if (string.IsNullOrWhiteSpace(value?.ToString()))
{
return(ValidationResult.Success);
}
if (value is not string path)
{
return(new ValidationResult("Invalid value type."));
}
try
{
var result = DirectoryUtil.ExistsOrNullIfTimeout(path, TimeSpan.FromSeconds(2));
if (result == null)
{
return(new ValidationResult("Timed out accessing directory."));
}
return(result.Value ? ValidationResult.Success : new ValidationResult("Directory doesn't exist."));
}
catch (Exception ex)
{
if (ex is AggregateException aggregate)
{
ex = aggregate.InnerException ?? ex;
}
return(new ValidationResult("Cannot access directory: " + ex.Message));
}
}