XmlDownloadManager.cs

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using System.IO;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
 
namespace System.Xml;
 
internal sealed class XmlDownloadManager
{
    internal Stream GetStream(Uri uri, ICredentials credentials, IWebProxy proxy)
    {
        if (uri.Scheme == "file")
        {
            return new FileStream(uri.LocalPath, FileMode.Open, FileAccess.Read, FileShare.Read, 1);
        }
        return GetNonFileStreamAsync(uri, credentials, proxy).GetAwaiter().GetResult();
    }
 
    internal Task<Stream> GetStreamAsync(Uri uri, ICredentials credentials, IWebProxy proxy)
    {
        if (uri.Scheme == "file")
        {
            Uri fileUri = uri;
            return Task.Run((Func<Stream>)(() => new FileStream(fileUri.LocalPath, FileMode.Open, FileAccess.Read, FileShare.Read, 1, useAsync: true)));
        }
        return GetNonFileStreamAsync(uri, credentials, proxy);
    }
 
    private async Task<Stream> GetNonFileStreamAsync(Uri uri, ICredentials credentials, IWebProxy proxy)
    {
        HttpClientHandler httpClientHandler = new HttpClientHandler();
        using HttpClient client = new HttpClient(httpClientHandler);
        if (credentials != null)
        {
            httpClientHandler.Credentials = credentials;
        }
        if (proxy != null)
        {
            httpClientHandler.Proxy = proxy;
        }
        using Stream stream = await client.GetStreamAsync(uri).ConfigureAwait(continueOnCapturedContext: false);
        MemoryStream memoryStream = new MemoryStream();
        stream.CopyTo(memoryStream);
        memoryStream.Position = 0L;
        return memoryStream;
    }
}