![]() ![]() The previous inbound flight identifier ( prevInboundFlightId) and previous outbound flight identifier ( prevOutboundFlightId) track information for the next potential component update. The following airline flight search tool example uses private fields to track the necessary information to detect changes. If authoring a UI-only component that doesn't change after the initial render, regardless of parameter value changes. ![]() ![]() To accept nonprimitive parameter values, such as complex custom model types, event callbacks, or RenderFragment values.If you render a child component with, where CustomerId is an int type, then the Customer component isn't rerendered unless item.CustomerId changes. The built-in logic for detecting changes automatically skips rerendering if the primitive immutable parameter values haven't changed. Ensure that child component parameters are of primitive immutable types, such as string, int, bool, DateTime, and other similar types.To prevent rendering recursion into a particular subtree, use either of the following approaches: Events targeting high-level components can cause expensive rerendering because every component below the high-level component must rerender. In many cases, the entire subtree is rerendered. The last two steps of the preceding sequence continue recursively down the component hierarchy. By default, components rerender if the parameter values may have changed, for example, if they're mutable objects. After a new set of parameter values is received, each component decides whether to rerender.When a component is rerendered, it supplies a new copy of parameter values to each of its child components.After executing the event handler, the component is rerendered. The event is dispatched to the component that rendered the event's handler.When an event occurs, such as a user selecting a button, the following process determines which components to rerender: In turn, the root's children have their own child components, and so on. You should only be concerned about skipping the rerendering subtrees that are particularly expensive to render and are causing UI lag.Īt runtime, components exist in a hierarchy. You might be able to remove the majority of a parent component's rendering cost by skipping the rerendering of child component subtrees when an event occurs. Avoid unnecessary rendering of component subtrees Optimize rendering speed to minimize rendering workload and improve UI responsiveness, which can yield a ten-fold or higher improvement in UI rendering speed. ![]()
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