dotnet/wpf · error · XamlParseException

SR.InvalidEndOfBaml

Error message

SR.InvalidEndOfBaml

What it means

After the node loop finishes, LoadBamlImp expects the reader to be exhausted and the node stack empty; if either is true it throws this XamlParseException. The BAML stream ended prematurely or contained extra content.

Solutions

1. Obtain a complete, untruncated resource assembly (verify file size/checksum)
2. Ensure the correct resource entry is loaded, not a partial one
3. Rebuild the satellite assembly
4. Don't concatenate or post-process BAML streams

Example fix

// before
// reading a partially copied resources.dll
// after
// verify hash of resources.dll against build output before loading

if (bamlStream.Length == 0 || bamlStream.Position + 1 >= bamlStream.Length) throw new IOException("BAML stream is empty or truncated");

try { tree = deserializer.LoadBaml(); } catch (XamlParseException ex) when (ex.Message.Contains("EndOfBaml")) { /* reload a verified copy of the resource */ }

When it happens

Trigger: Truncated BAML stream (ends before all nodes are closed) or extra bytes/nodes after the document end — e.g. a partial file copy or concatenated streams.

Common situations: Interrupted downloads/copies of resource assemblies; hand-stitched BAML; wrong resource entry read from the assembly.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• SR.InvalidStartOfBaml
• SR.UnRecognizedBamlNodeType
• Can't Assign to Known Type attributes
• Could not find prefix for type
• Found unexpected Xmlns BAML record

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/152b8e24cfab1888. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/MS/Internal/Globalization/BamlResourceDeserializer.cs:295

                                        _reader.Name,
                                        _reader.Value
                                        );
                                    AddChildToCurrentParent(bamlNode);
                                    break;
                                }
                            default:
                                {
                                    throw new XamlParseException(SR.Format(SR.UnRecognizedBamlNodeType, _reader.NodeType));
                                }
                        }
                    } while (_reader.MoveToNextProperty());
                }
            }

            // At this point, the baml tree stack should be completely unwinded and also nothing more to read.
            if (_reader.Read() || _bamlTreeStack.Count > 0)
            {
                throw new XamlParseException(SR.InvalidEndOfBaml);
            }

            return new BamlTree(_root, _nodeCount);
            //notice that we don't close the input stream because we don't own it.
        }

        private void PushNodeToStack(BamlTreeNode node)
        {
            _currentParent?.AddChild(node);

            _bamlTreeStack.Push(node);
            _currentParent = node;
            _nodeCount++;
        }

        private void AddChildToCurrentParent(BamlTreeNode node)
        {
            if (_currentParent == null)

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