将同步通话更改为异步

Question

I have the following code in a library Helper.dll . This assembly has an embedded XML file called Products.XML . The method GetProducts works fine. But it takes few seconds to respond because it is synchronous. I want to release the UI when this load operation was going on.

There are no async calls are available for LINQ to XML operations like XDocument.Load , so I can not use async and await here.

Appreciate any answer.

public static class LookupUtil
{
    public static IEnumerable<XElement> GetProducts()
    {
        var stream = Assembly.
            GetExecutingAssembly().
            GetManifestResourceStream("Helper.Products.XML");
        var reader = new XmlTextReader(stream);
        var document = XDocument.Load(reader);

        return document.Descendants("Products");
    }
}

Answer 1

If you don't have any asynchronous operations inside that method don't change it and keep it synchronous .

use Task.Run when you call it from the UI thread to offload that synchronous work to a different thread and await the returned task:

var elements = await Task.Run(() => LookupUtil.GetProducts());

What you are basically doing is treating a block of synchronous code asynchronously.