![]() This outcome is identical to the prior case, so no negative issues exist. The first output is seen in the following table. Imagine instead that you wrote the following render tree builder logic: var seq = 0 The problem with generating sequence numbers programmatically When the runtime performs a diff, it sees that the item at sequence 0 was removed, so it generates the following trivial edit script with a single step: This time, the builder receives the sequence in the following table. Imagine that someFlag becomes false and the markup is rendered again. When the code executes for the first time and someFlag is true, the builder receives the sequence in the following table. The preceding Razor markup and text content compiles into C# code similar to the following: if (someFlag) The runtime uses this information to generate efficient tree diffs in linear time, which is far faster than is normally possible for a general tree diff algorithm.Ĭonsider the following Razor component file (. Sequence numbers indicate to the runtime which outputs came from which distinct and ordered lines of code. Executing compiled code has a potential advantage over interpreting code because the compile step that yields the compiled code can be used to inject information that improves app performance at runtime.Ī key example of these improvements involves sequence numbers. Sequence numbers relate to code line numbers and not execution order These types should be considered unstable and subject to change in future releases. ![]() These are internal details of the Blazor framework implementation. The types in allow processing of the results of rendering operations. Private RenderFragment CreateComponent() => builder =>īuilder.OpenComponent(0, typeof(PetDetails)) īuilder.AddAttribute(1, "PetDetailsQuote", "Someone's best friend!") Shared/PetDetails.razor: Pet string? PetDetailsQuote RenderTreeBuilder provides methods for manipulating components and elements, including building components manually in C# code.Ĭonsider the following PetDetails component, which can be manually rendered in another component. Manually build a render tree ( RenderTreeBuilder)
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