XmlUrlResolver.cs

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using System.IO;
using System.Net;
using System.Net.Cache;
using System.Runtime.Versioning;
using System.Threading;
using System.Threading.Tasks;
 
namespace System.Xml;
 
public class XmlUrlResolver : XmlResolver
{
    private static XmlDownloadManager s_downloadManager;
 
    private ICredentials _credentials;
 
    private IWebProxy _proxy;
 
    private static XmlDownloadManager DownloadManager => s_downloadManager ?? Interlocked.CompareExchange(ref s_downloadManager, new XmlDownloadManager(), null) ?? s_downloadManager;
 
    [UnsupportedOSPlatform("browser")]
    public override ICredentials? Credentials
    {
        set
        {
            _credentials = value;
        }
    }
 
    [UnsupportedOSPlatform("browser")]
    public IWebProxy? Proxy
    {
        set
        {
            _proxy = value;
        }
    }
 
    public RequestCachePolicy CachePolicy
    {
        set
        {
        }
    }
 
    public override object? GetEntity(Uri absoluteUri, string? role, Type? ofObjectToReturn)
    {
        if ((object)ofObjectToReturn == null || ofObjectToReturn == typeof(Stream) || ofObjectToReturn == typeof(object))
        {
            return DownloadManager.GetStream(absoluteUri, _credentials, _proxy);
        }
        throw new XmlException(System.SR.Xml_UnsupportedClass, string.Empty);
    }
 
    public override Uri ResolveUri(Uri? baseUri, string? relativeUri)
    {
        return base.ResolveUri(baseUri, relativeUri);
    }
 
    public override async Task<object> GetEntityAsync(Uri absoluteUri, string? role, Type? ofObjectToReturn)
    {
        if (ofObjectToReturn == null || ofObjectToReturn == typeof(Stream) || ofObjectToReturn == typeof(object))
        {
            return await DownloadManager.GetStreamAsync(absoluteUri, _credentials, _proxy).ConfigureAwait(continueOnCapturedContext: false);
        }
        throw new XmlException(System.SR.Xml_UnsupportedClass, string.Empty);
    }
}