WebException.cs

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using System.Net.Http;
using System.Net.Sockets;
using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
using System.Threading.Tasks;
 
namespace System.Net;
 
[Serializable]
[TypeForwardedFrom("System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public class WebException : InvalidOperationException, ISerializable
{
    private readonly WebExceptionStatus _status = WebExceptionStatus.UnknownError;
 
    private readonly WebResponse _response;
 
    public WebExceptionStatus Status => _status;
 
    public WebResponse? Response => _response;
 
    public WebException()
    {
    }
 
    public WebException(string? message)
        : base(message)
    {
    }
 
    public WebException(string? message, Exception? innerException)
        : this(message, innerException, WebExceptionStatus.UnknownError, null)
    {
    }
 
    public WebException(string? message, WebExceptionStatus status)
        : this(message, null, status, null)
    {
    }
 
    public WebException(string? message, Exception? innerException, WebExceptionStatus status, WebResponse? response)
        : base(message, innerException)
    {
        _status = status;
        _response = response;
        if (innerException != null)
        {
            base.HResult = innerException.HResult;
        }
    }
 
    protected WebException(SerializationInfo serializationInfo, StreamingContext streamingContext)
        : base(serializationInfo, streamingContext)
    {
    }
 
    void ISerializable.GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext)
    {
        base.GetObjectData(serializationInfo, streamingContext);
    }
 
    public override void GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext)
    {
        base.GetObjectData(serializationInfo, streamingContext);
    }
 
    internal static Exception CreateCompatibleException(Exception exception)
    {
        if (exception is HttpRequestException ex)
        {
            return new WebException(exception.Message, exception, GetStatusFromException(ex), null);
        }
        if (exception is TaskCanceledException)
        {
            return new WebException(System.SR.net_webstatus_Timeout, null, WebExceptionStatus.Timeout, null);
        }
        return exception;
    }
 
    private static WebExceptionStatus GetStatusFromExceptionHelper(HttpRequestException ex)
    {
        if (!(ex.InnerException is SocketException { SocketErrorCode: var socketErrorCode }))
        {
            return WebExceptionStatus.UnknownError;
        }
        if (socketErrorCode == SocketError.HostNotFound || socketErrorCode == SocketError.NoData)
        {
            return WebExceptionStatus.NameResolutionFailure;
        }
        return WebExceptionStatus.UnknownError;
    }
 
    internal static WebExceptionStatus GetStatusFromException(HttpRequestException ex)
    {
        int hResult = ex.HResult;
        if (hResult == -2147012889)
        {
            return WebExceptionStatus.NameResolutionFailure;
        }
        return GetStatusFromExceptionHelper(ex);
    }
}