Download XDocument asynchronously

Question

I want to load large XML documents into XDocument objects. A simple synchronous approach using XDocument.Load(path, loadOptions)works fine, but blocks for an awkwardly long time in the context of the graphical interface when downloading large files (especially from network storage).

I wrote this asynchronous version to improve responsiveness when downloading a document, especially when downloading files over the network.

    public static async Task<XDocument> LoadAsync(String path, LoadOptions loadOptions = LoadOptions.PreserveWhitespace)
    {
        String xml;

        using (var stream = File.OpenText(path))
        {
            xml = await stream.ReadToEndAsync();
        }

        return XDocument.Parse(xml, loadOptions);
    }

However, on a 200 MB boot disk loaded from a local disk, the synchronous version will complete in a few seconds. The asynchronous version (working in a 32-bit context) instead creates OutOfMemoryException:

   at System.Text.StringBuilder.ToString()
   at System.IO.StreamReader.<ReadToEndAsyncInternal>d__62.MoveNext()

, , XML XDocument. XDocument.Load() String .

? XDocument - ?

Answer 1

. async IO, .

public static async Task<XDocument> LoadAsync
 ( String path
 , LoadOptions loadOptions = LoadOptions.PreserveWhitespace
 )
{
    return Task.Run(()=>{
     using (var stream = File.OpenText(path))
        {
            return XDocument.Load(stream, loadOptions);
        }
    });
}

Parse, .

Answer 2

XDocument.LoadAsync() .NET Core 2.0: https://docs.microsoft.com/en-us/dotnet/api/system.xml.linq.xdocument.loadasync?view=netcore-2.0