Blazor - SetParameters - 为什么字符串参数绑定的行为与复杂类型不同 [英] Blazor - SetParameters - why string parameter binding behaves differently from a complex type

问题描述

考虑带有字符串参数和复杂类型参数的子组件.

Consider child component with string parameter and with a complex type parameter.

<Child Name="@strProperty" />
<Child Model="@compelexType" />

假设两个参数都没有改变，在父组件上调用 StateHasChanged 会导致具有复杂参数的子组件重新渲染，但不会重新渲染字符串参数.

Assuming neither parameter has changed, calling StateHasChanged on the parent component causes the Child component with complex parameter to rerender, but not with string parameter.

查看此演示:https://blazorrepl.com/repl/wbYguGuA515uMYR742

你如何解释不同的行为?

How do you explain different behavior?

推荐答案

文档:

继承自 ComponentBase如果满足以下任一条件，则跳过由于参数更新而导致的重新渲染:

Components inherited from ComponentBase skip rerenders due to parameter updates if either of the following are true:

• 所有参数值都是已知的不可变原始类型，例如int、string>、DateTime 和 自上一组参数设置以来没有改变.
• 组件的ShouldRender 方法返回 false.

• All of the parameter values are of known immutable primitive types, such as int, string, DateTime, and haven't changed since the previous set of parameters were set.
• The component's ShouldRender method returns false.

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