Clash Royale CLAN TAG#URR8PPP

How to read in an XML file asynchronously?

I am writing a Windows Form Application for data post-processing. I have a panel where I allow for files to be dragged and dropped. The XML files will be quite large (enough to slow the UI down). Therefore I would like to read the file in asynchronously. So far for this part of the app I have two methods:

namespace myApp

public partial class Form1 : Form

public Form1()

InitializeComponent();


private void DragDropPanel_DragEnter(object sender, DragEventArgs e)

// Trigger the Drag Drop Event
e.Effect = DragDropEffects.Copy;


private async void DragDropPanel_DragDrop(object sender, DarEventArgs e)

// Identifiers used are:
string filePaths = (string)e.Data.GetData(DataFormats.FileDrop);
string filePath = filePaths[0],
fileName = System.IO.Path.GetFileName(filePath);

// Read in the file asynchronously
XmlReader reader = XmlReader.Create(filePath);
//reader.Settings.Async = true; // ** (SECOND ERROR) ** \
while (await reader.ReadAsync()) // ** (FIRST ERROR) ** \

Console.WriteLine("testing...");


// Do other things...





Now when I drag and drop the XML file I get the following error:

System.InvalidOperationException:
Set XmlReaderSettings.Async to true if you want to use Async Methods.


this error occurs because of the line I labeled with FIRST ERROR. I attempt to fix this by uncommenting the line above it which I have labeled with SECOND ERROR. Now when I drag and drop I get the error:

System.Xml.Xml.XmlException:
The XmlReaderSettings.Async property is read only and cannot be set


So I go to the MS Docs for the XmlReaderSettings.Async property and it says:

You must set this value to true when you create a new XmlReader instance if you want to use asynchronous XmlReader methods on that instance.

Which then gives the reason why the SECOND ERROR occurs. However, I cannot get this to work. Any tips?

1 Answer
1

You need to Create the XmlReader with the proper settings.

XmlReaderSettings settings = new XmlReaderSettings

Async = true
;
XmlReader reader = XmlReader.Create(filePath, settings);


References:
https://msdn.microsoft.com/en-us/library/ms162474(v=vs.110).aspx
https://msdn.microsoft.com/en-us/library/system.xml.xmlreadersettings(v=vs.110).aspx

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