You only need to prefix an if statement with @ if you're not already inside a razor code block. Edit: You have a couple of things wrong with ... ... <看更多>

If you find a pattern getting too repetitive, you can use @helper instead: @helper ShowIfNotNull(string header) { @if (!string. ... <看更多>

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Then razor finds the closing bracket for the foreach, but associates it to the parent bracket enclosing the overall razor code block. This ... ... <看更多>