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Blazor WASM perf ShouldRender updates (#18957)

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Luke Latham 2020-06-25 08:51:31 -05:00 committed by GitHub
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aspnetcore/blazor/webassembly-performance-best-practices.md
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@ -5,7 +5,7 @@ description: Tips for increasing performance in ASP.NET Core Blazor WebAssembly
monikerRange: '>= aspnetcore-2.1'
ms.author: riande
ms.custom: mvc
ms.date: 06/08/2020
ms.date: 06/25/2020
no-loc: [Blazor, "Identity", "Let's Encrypt", Razor, SignalR]
uid: blazor/webassembly-performance-best-practices
---
@ -27,7 +27,7 @@ If authoring a UI-only component that never changes after the initial render, co
}
```
Most apps don't require fine-grained control, but <xref:Microsoft.AspNetCore.Components.ComponentBase.ShouldRender%2A> can also be used to selectively render a component responding to a UI event.
Most apps don't require fine-grained control, but <xref:Microsoft.AspNetCore.Components.ComponentBase.ShouldRender%2A> can be used to selectively render a component responding to a UI event. Using <xref:Microsoft.AspNetCore.Components.ComponentBase.ShouldRender%2A> might also be important in scenarios where a large number of components are rendered. Consider a grid, where use of <xref:Microsoft.AspNetCore.Components.EventCallback> in one component in one cell of the grid calls <xref:Microsoft.AspNetCore.Components.ComponentBase.StateHasChanged%2A> on the grid. Calling <xref:Microsoft.AspNetCore.Components.ComponentBase.StateHasChanged%2A> causes a re-render of every child component. If only a small number of cells require rerendering, use <xref:Microsoft.AspNetCore.Components.ComponentBase.ShouldRender%2A> to avoid the performance penalty of unnecessary renders.
In the following example: