dotnet/wpf · error · ArgumentException

SR.UriNotAbsolute

Error message

SR.UriNotAbsolute

What it means

ColorContext's Initialize throws ArgumentException when the supplied profileUri is not an absolute URI. The context must be able to resolve and load the profile file/package part, which requires an absolute URI; relative URIs are rejected up front (after a null check).

Solutions

  1. Build an absolute URI: new Uri(new Uri(AppContext.BaseDirectory), relativePath) or use an absolute pack URI (pack://application:,,,/Profiles/x.icc).
  2. Specify UriKind.Absolute when constructing from a string with a full path.
  3. Guard with profileUri.IsAbsoluteUri before constructing the ColorContext and resolve relative paths first.

Example fix

// before
var ctx = new ColorContext(new Uri("Profiles/sRGB.icc")); // ArgumentException
// after
var abs = new Uri(new Uri(AppContext.BaseDirectory), "Profiles/sRGB.icc");
var ctx = new ColorContext(abs);
Defensive patterns

Strategy: validation

Validate before calling

if (profileUri == null) throw new ArgumentNullException(nameof(profileUri));
if (!profileUri.IsAbsoluteUri) throw new ArgumentException("Profile URI must be absolute", nameof(profileUri));

Type guard

bool IsValidProfileUri(Uri u) => u is not null && u.IsAbsoluteUri;

Try / catch

try { var ctx = new ColorContext(profileUri); }
catch (ArgumentException ex) when (ex.ParamName == nameof(profileUri)) { profileUri = MakeAbsolute(profileUri); var ctx = new ColorContext(profileUri); }

Prevention

When it happens

Trigger: new ColorContext(new Uri("profiles/sRGB.icc")) or new ColorContext(new Uri(relativeString, UriKind.Relative)) — profileUri.IsAbsoluteUri is false at ColorContext.cs:487.

Common situations: Config files or code storing profile paths as relative paths; pack URIs built without the pack:// scheme; string-to-Uri conversion defaulting to RelativeKind.

Understand the failure class

Background: "Invalid URL" errors: why new URL(), URI.parse, and reqwest::Url reject your string — missing scheme, whitespace, and bad path format — this error's family across 39 libraries.

Related errors

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/8de6358e12068129. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Media/ColorContext.cs:487

            return !(context1 == context2);
        }

        #endregion

        #region Private Methods

        /// <summary>
        /// Loads color profile given by profileUri
        /// </summary>
        private void Initialize(Uri profileUri, bool isStandardProfileUriNotFromUser)
        {
            bool tryProfileFromResource = false;

            ArgumentNullException.ThrowIfNull(profileUri);

            if (!profileUri.IsAbsoluteUri)
            {
                throw new ArgumentException(SR.UriNotAbsolute, nameof(profileUri));
            }

            // Security: When loading XPS content, block color profile URIs that
            // escape the current package to prevent SSRF. Standard system profiles
            // (isStandardProfileUriNotFromUser == true) are always local file
            // paths and are exempt from this check. Uses both ambient context
            // and captured origin for defense-in-depth.
            _xpsPackageOrigin = XpsLoadingContext.ActivePackageUri;
            if (!isStandardProfileUriNotFromUser
                && !XpsLoadingContext.IsUriAllowedAgainstPackage(_xpsPackageOrigin, profileUri))
            {
                throw new FileFormatException(SR.Resource_XpsPackageBoundaryViolation);
            }

            _profileUri = profileUri;
            _isProfileUriNotFromUser = isStandardProfileUriNotFromUser;

            Stream profileStream = null;

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