unoplatform/uno · error · Exception

Expected end of x:Bind expression or start of argument list.

Error message

Expected end of x:Bind expression or start of argument list.

What it means

XBindExpressionParser parses an x:Bind expression as a path optionally followed by an invocation. After the bind path, the only legal continuation is '(' to start an argument list; any other trailing token (operator, stray identifier, etc.) is invalid and throws.

Source

Thrown at src/SourceGenerators/Uno.UI.SourceGenerators/XamlGenerator/Utils/XBindExpressionParser.CoreParser.cs:52

		}

		public XBindRoot ParseXBind()
		{
			Debug.Assert(_position == 0, "ParseXBind should be called on the whole expression.");
			if (string.IsNullOrWhiteSpace(_xBind))
			{
				return null;
			}

			var bindPath = ParseXBindPath();
			if (IsDone)
			{
				return bindPath;
			}

			if (Current != '(')
			{
				throw new Exception("Expected end of x:Bind expression or start of argument list.");
			}

			_position++;
			if (Current == ')')
			{
				_position++;
				if (IsDone)
				{
					return new XBindInvocation() { Path = bindPath, Arguments = Array.Empty<XBindArgument>() };
				}

				throw new Exception("Expected end of expression after invocation.");
			}


			var arguments = new List<XBindArgument>();
			arguments.Add(ParseXBindArgument());
			while (Current == ',')

View on GitHub (pinned to 0418340488)

Solutions

1. Remove the trailing content so the x:Bind is a plain path or a path(args) invocation.
2. Move computed expressions into a bound method/property and bind to that.
3. Re-check the x:Bind syntax for stray characters.

Example fix

<!-- before -->
<TextBlock Text="{x:Bind Foo.Bar baz}" />
<!-- after -->
<TextBlock Text="{x:Bind Foo.Bar}" />

// Lint x:Bind: after the path, only '(' (invocation) or end-of-input is legal.
// Run a XAML linter that parses {x:Bind ...} and rejects stray trailing tokens.

When it happens

Trigger: An x:Bind expression has non-invocation trailing content after the path, e.g. {x:Bind Foo.Bar baz}, {x:Bind A+B}, or {x:Bind Foo;bar}.

Common situations: Hand-edited XAML with a malformed x:Bind; attempting an unsupported expression form (arithmetic/logic) that x:Bind does not parse here.

Related errors

• Expected end of expression after invocation.
• Expected ')' after parsing invocation arguments
• Missing closing quote
• Expected digits after floating point.
• Missing parenthesis?

AI-assisted analysis of unoplatform/uno@0418340488 (2026-08-13). Data as JSON: /api/errors/6c53001e171440b6. Report an issue: GitHub.