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Clarify Blazor loop vars in lambdas (#18661)

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Luke Latham 2020-06-04 06:48:35 -05:00 committed by GitHub
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aspnetcore/blazor/event-handling.md
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@ -5,7 +5,7 @@ description: Learn about Blazor's event handling features, including event argum
monikerRange: '>= aspnetcore-3.1'
ms.author: riande
ms.custom: mvc
ms.date: 03/16/2020
ms.date: 06/04/2020
no-loc: [Blazor, "Identity", "Let's Encrypt", Razor, SignalR]
uid: blazor/event-handling
---
@ -121,7 +121,7 @@ It's often convenient to close over additional values, such as when iterating ov
```
> [!NOTE]
> Do **not** use the loop variable (`i`) in a `for` loop directly in a lambda expression. Otherwise the same variable is used by all lambda expressions causing `i`'s value to be the same in all lambdas. Always capture its value in a local variable (`buttonNumber` in the preceding example) and then use it.
> Do **not** use a loop variable directly in a lambda expression, such as `i` in the preceding `for` loop example or a reference variable in a `foreach` loop. Otherwise, the same variable is used by all lambda expressions, which results in use of the same value in all lambdas. Always capture the variable's value in a local variable and then use it. In the preceding example, the loop variable `i` is assigned to `buttonNumber`.
## EventCallback