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How do I conditionally change the CSS class names for a Blazor element?

Platform: Blazor| Category: Data binding

You have to use the binding in a ternary operator to achieve this.

<div class="menu @(IsOpen ? "open" : "")"></div>

<button @onclick="@AddClass">Add Class</button>
@code {

    private bool IsOpen { get; set; } = false;

    private void AddClass()
        IsOpen = !IsOpen;

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