unoplatform/uno · error · Exception

Missing closing quote

Error message

Missing closing quote

What it means

When parsing a string literal argument in an x:Bind invocation, the parser expects a matching closing '"' before end-of-input. If the opening quote is never closed, it throws. Example trigger: {x:Bind Foo("unclosed)}.

Source

Thrown at src/SourceGenerators/Uno.UI.SourceGenerators/XamlGenerator/Utils/XBindExpressionParser.CoreParser.cs:104

			return new XBindInvocation() { Path = bindPath, Arguments = arguments.ToArray() };
		}

		private XBindArgument ParseXBindArgument()
		{
			SkipWhitespaces();
			if (Current == '"')
			{
				// literal string argument
				var oldPosition = _position++;
				while (!IsDone && Current != '"')
				{
					_position++;
				}

				if (Current != '"')
				{
					throw new Exception("Missing closing quote");
				}

				var literal = _xBind.Substring(oldPosition, ++_position - oldPosition);
				return new XBindLiteralArgument() { LiteralArgument = literal };
			}
			else if (char.IsDigit(Current))
			{
				// literal numeric argument
				var oldPosition = _position;
				while (char.IsDigit(Current))
				{
					_position++;
				}

				if (Current == '.')
				{
					_position++;
					if (!char.IsDigit(Current))

View on GitHub (pinned to 0418340488)

Solutions

1. Add the closing '"' for the string literal.
2. Escape any literal quotes inside the string if needed.

Example fix

<!-- before -->
<TextBlock Text="{x:Bind Greet("world}" />
<!-- after -->
<TextBlock Text="{x:Bind Greet("world")}" />

static bool HasClosingQuote(string expr)
{ bool open = false; foreach (var c in expr) { if (c == '"') open = !open; } return !open; }

When it happens

Trigger: An x:Bind string literal argument whose opening '"' has no closing '"', e.g. {x:Bind Foo("bar)}.

Common situations: Unterminated string literal in a hand-edited x:Bind; a copy/paste that dropped the closing quote.

Related errors

• Expected end of x:Bind expression or start of argument list.
• Expected end of expression after invocation.
• Expected ')' after parsing invocation arguments
• Expected digits after floating point.
• Missing parenthesis?

AI-assisted analysis of unoplatform/uno@0418340488 (2026-08-13). Data as JSON: /api/errors/f195edbdbf57e81a. Report an issue: GitHub.