fedora-28 相关问题

我在 Fedora 33 上进行了全新安装，现在我发现出现了错误，例如事务错误：ldacbt-2.0.2.3-7.fc33.x86_64 中的文件 /usr/lib64/libldacBT_abr.so.2.0.2.3 与...

我有一个输入形状为 (1, 1, 28, 28) 的 ONNX 模型，它采用 NCHW 布局。有什么方法可以将模型转换为 NHWC 布局中的输入数据，即 (1, 28, 28, 1)？...

在我的 React Typescript 应用程序中，我收到此错误。 webpack 编译时出现 1 个警告 src/App.tsx 中出现错误：30:21 TS2304：找不到名称“DecompressionStream”。 28 | 28 const enc = new TextEncoder()...

在 ec2 中安装节点，Amazon Linux2 错误 glibc >= 2.28

尝试在以下位置安装 npm 和 node：猫 /etc/os-release 名称=“亚马逊Linux” 版本=“2” ID=“amzn” ID_LIKE="centos rhel fedora" 版本_ID=“2” 漂亮...

如何使用具有列表列表值的字典从 Bigquery 中的表进行查询

我有一个bigquery表如下 idx 信息 1 {'columns':['name','age'], data:[['Sheldon', 29], ['Raj',28]]} 2 {'columns':['姓名','年龄'], 数据:[['伦纳德', 28], ['霍华德',29]]} 信息是一个字符串

使用-O3时确定段错误的原因？

当使用 -O3 和 GCC 4.8/4.9/5.1 编译程序时，我无法确定段错误的原因。对于 GCC 4.9.x，我在 Cygwin、Debian 8 (x64) 和 Fedora 21 (x64) 上看到过它。其他人有

“未安装内核驱动程序（rc=-1908）”

将 Fedora 完全重新安装到版本 36 后，我收到此错误：未安装内核驱动程序（rc=-1908） VirtualBox Linux 内核驱动程序未加载或设置不正确。请尝试一下

“在‘redux’中找不到导出‘createStore’

./node_modules/@redux-saga/core/dist/redux-saga-core.esm.js 中的警告 1343:21-28 “在‘redux’中找不到导出‘compose’ @ ./node_modules/redux-saga/dist/redux-saga-core-npm-proxy.esm.js ...

MariaDB 数据插入，2 字节字母出现错误消息。你能看一下我的代码吗？

我已经将数据库从 MySQL 5.0 (Fedora Core 7) 迁移到 MariaDB 10.5 到最新的 OS Rocky 9.1。就 ASCII 1 字节文本数据而言，没有问题。现在，我有足够的 2 字节字符...

尽可能快地进行嵌套循环

spatial_data = [[1,2,3,4,5,6], ....., [1,2,3,4,50,60]] #长度1000万参考 = [[9, 39, 22, 28, 25, 5], ...... , [5, 16, 12, 34, 3, 9]] # 长度 100 对于参考中的 x：结果 = [c 为...

VBA Like 运算符/正则表达式

在VBA中，匹配以下每个字符串的正则表达式是什么：56-...和...-28？对于第二个，我尝试了以下方法，但没有成功： Target.Value 就像“[\.]{3}[\-]{1}[0-...

基于公共列将独立查询连接在一起

我有以下查询，我根据给定的动态日期范围（即 10-01-2024 - 10-28-2024）计算平均值。这是如下所示的 SUM(ROUND(QTY_AVG.AVERAGE,2)) DATE_RANGE_AVERAGE 列。我

如何将 DMS 转换为给定格式的弧度：Python 中的 DD-MM-SS [已关闭]

我想知道如何将 DMS 从给定格式 DD-MM-SS 转换为弧度这个“print (DMStoRAD(47-39-28))”的解应该是 0.831785 谢谢！

玩笑更新后无法读取未定义的属性“html”

对于使用 jest 的 Angular v12 项目，我刚刚将 jest 更新到版本 28。但是现在，我收到以下错误失败 src/app/components/update-input/update-input.directive.spec.ts ● 测试套件

VBA 中包含点的正则表达式

在VBA中，匹配以下每个字符串的正则表达式是什么？第一： 56-... 第二个： ...-28 对于第二个，我尝试了以下方法，但没有结果：目标.值就像...

字符到日期的更改在数据框中产生“NA”

在数据框中，有一列以日期信息作为字符 str(mv$datum_mw) chr [1:6] “2012年11月15日” “2013年1月28日” “2014年8月12日” “2015年2月12日”...

如何在 UNITY Oculus Quest 2 和 Vive Focus 中获取 Android 设备序列号（在 Android 10 API 级别 28 上）

我需要序列号或类似的东西，因为我们公司创建 VR 应用程序，我创建必须在多个应用程序中识别特定设备的 Web API，因为我们

Qt 单元测试框架中的“0 次跳过，0 次列入黑名单”是什么意思？

当我运行 Qt 单元测试项目时，它以如下所示的摘要结束：总计：28 次通过，1 次失败，0 次跳过，0 次列入黑名单 “通过”和“失败”类别很明显，但我...

如何按列而不是按行填充数组？

我需要制作一个 10 x 10 的二维数组，如下所示： 0 45 44 42 39 35 30 24 17 9 0 0 43 41 38 34 29 23 16 8 0 0 0 40 37 33 28 22 15 7 0 0 0 0 36 32 27 21 14 6 0 0 0 0 0 31 26 20 13 5 ...

带斜杠的边框半径在 React-pdf 中不起作用

我知道我们可以在CSS中为半圆设置border-radius: 4px/2px。但它在 React pdf 中不起作用。我尝试过这些。我知道我们可以在CSS中为半圆设置border-radius: 4px/2px。但它在 React pdf 中不起作用。我尝试过这些。你好我导入了所有 React pdf 元素。但是当我尝试上述设计时，我在控制台中收到错误。错误是 @react-pdf_renderer.js?v=e8b1cced:113701 Error: unsupported number: NaN at number2 (@react-pdf_renderer.js?v=e8b1cced:58798:11) at PDFDocument2.lineTo (@react-pdf_renderer.js?v=e8b1cced:59998:28) at clipNode2 (@react-pdf_renderer.js?v=e8b1cced:32924:7) at renderBackground3 (@react-pdf_renderer.js?v=e8b1cced:34087:5) at renderNode3 (@react-pdf_renderer.js?v=e8b1cced:34139:3) at renderChild2 (@react-pdf_renderer.js?v=e8b1cced:34123:12) at Array.forEach (<anonymous>) at renderChildren2 (@react-pdf_renderer.js?v=e8b1cced:34125:12) at renderNode3 (@react-pdf_renderer.js?v=e8b1cced:34145:5) at renderChild2 (@react-pdf_renderer.js?v=e8b1cced:34123:12) 有人可以帮忙吗测试此类语法的最简单方法是在 repl 中https://react-pdf.org/repl 简短的回答是 4px/2 不是单个 px 值，因此 = NAN 使用任何其他单个愚蠢的数字即可。

在 HTML 文档中嵌入 TypeScript 代码

是否可以在网页中嵌入 TypeScript 代码？我想将 TypeScript 代码嵌入到脚本标签中，如下所示（以便它自动编译为 Javascript）： <p>是否可以在网页中嵌入 TypeScript 代码？我想将 TypeScript 代码嵌入到脚本标签中，如下所示（以便它自动编译为 Javascript）：</p> <pre><code><script type = "text/typescript"> //TypeScript code goes here </script> </code></pre> </question> <answer tick="true" vote="28"> <p>实际上有几个项目允许您使用类似的 TypeScript 代码 - <a href="https://github.com/niutech/typescript-compile" rel="noreferrer">TypeScript Compile</a>、<a href="https://github.com/ComFreek/ts-htaccess" rel="noreferrer">ts-htaccess</a>。</p> <p>这里的问题是 .ts 代码应该编译成 JavaScript - 它可以在客户端完成（速度慢；整个 TSC 也应该加载到客户端）或在服务器端完成（显然更快，而且它更快）在编译代码上利用缓存要容易得多）。</p> </answer> <answer tick="false" vote="18"> <p>这是我编写的版本，<strong>直接</strong>使用 Microsoft/TypeScript/master 的版本，因此它始终保持最新：<a href="https://github.com/basarat/typescript-script" rel="noreferrer">https://github.com/basarat/typescript-script</a></p> <p>您甚至可以将 <pre><code>ts</code></pre> 指向您可能拥有的任何其他 TypeScript 版本，它会正常工作 🌹</p> </answer> <answer tick="false" vote="6"> <p>已经为此目的开发了一个 JavaScript 库 - 它称为 <a href="https://github.com/niutech/typescript-compile" rel="noreferrer">TypeScript Compile</a>，它允许将 Typescript 嵌入到 HTML 中（如上所示。）</p> </answer> <answer tick="false" vote="0"> <p>我写这篇文章的目的是为了在浏览器中编译 TypeScript，以便我可以编写快速简单的示例来分享。</p> <p><a href="https://github.com/Sean-Bradley/text-typescript" rel="nofollow noreferrer">https://github.com/Sean-Bradley/text-typescript</a></p> <p>使用，</p> <pre><code><script type="text/typescript"> // Your TypeScript code here </script> </code></pre> <p>并包含依赖项。</p> <pre><code><script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" data-cfemail="67131e17021404150e1713275249544954">[email protected]</a>"></script> <script defer src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" data-cfemail="3743524f431a434e47524454455e4743770619041907">[email protected]</a>"></script> </code></pre> <p>一个完整的示例，您可以复制/粘贴到 HTML 文档中并在本地尝试。</p> <pre><code><!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <title>"text/typescript" example</title> <meta name="description" content="Transpiling and executing TypeScript in the browser" /> <style> body { overflow: hidden; margin: 0px; font-size: 15vw; } </style> <script type="text/typescript"> function foo(bar: string) { return "Hello " + bar; } let baz = "World!"; document.getElementById("root").innerHTML = foo(baz); </script> <script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" data-cfemail="13676a63766070617a636753263d203d20">[email protected]</a>"></script> <script defer src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" data-cfemail="ec98899498c198959c899f8f9e859c98acddc2dfc2dc">[email protected]</a>"></script> </head> <body> <div id="root"></div> </body> </html> </code></pre> <p>你可以看到它在这里、现在、今天发挥作用。</p> <p><a href="https://editor.sbcode.net/f1f4b5a73ec40283d1ddb37bb1e71f7e4e31b487" rel="nofollow noreferrer">https://editor.sbcode.net/f1f4b5a73ec40283d1ddb37bb1e71f7e4e31b487</a></p> </answer> </body></html>

错误：在此 BlocBuilder<InternetBloc> Widget<InternetBloc, InternetState> 上方找不到正确的提供程序

我在尝试将 flutter_bloc 集成到 flutter 项目中时遇到错误。错误：在此 BlocBuilder 上方找不到正确的 Provider 我在尝试将 flutter_bloc 集成到 flutter 项目中时遇到错误。错误：在此 BlocBuilder Widget 上方找不到正确的提供者这是我正在使用的代码示例。 internet_state.dart abstract class InternetState{} class InitialInternetState extends InternetState{} class LostConnectionInternetState extends InternetState{} class GainConnectionInternetState extends InternetState{} internet_event.dart abstract class InternetEvent{} class LostConnectionEvent extends InternetEvent{} class GainConnectionEvent extends InternetEvent{} internet_bloc.dart class InternetBloc extends Bloc<InternetEvent, InternetState>{ final Connectivity _connectivity = Connectivity(); StreamSubscription? streamSubscription; InternetBloc() : super(InitialInternetState()){ on<GainConnectionEvent>((event, emit) => emit(GainConnectionInternetState())); on<LostConnectionEvent>((event, emit) => emit(LostConnectionInternetState())); _connectivity.onConnectivityChanged.listen((event) { if(event == ConnectivityResult.mobile || event == ConnectivityResult.wifi){ add(GainConnectionEvent()); } else { add(LostConnectionEvent()); } }); } @override Future<void> close() { streamSubscription?.cancel(); return super.close(); } } main.dart class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple), useMaterial3: true, ), home: const MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text(title),), body: SafeArea( child: Center(child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, )), ),); } } 我明白了。 ======== 小部件库捕获异常====================================== =================== 构建 MediaQuery(MediaQueryData(size: Size(392.7, 783.3), devicePixelRatio: 2.8, textScaler: noscaling, platformBrightness: Brightness.light, padding: EdgeInsets.zero, viewPadding: EdgeInsets.zero, viewInsets: EdgeInsets 时抛出以下 ProviderNotFoundException。零，systemGestureInsets：EdgeInsets（29.8，24.0，29.8，8.0），alwaysUse24HourFormat：假，accessibleNavigation：假，highContrast：假，onOffSwitchLabels：假，disableAnimations：假，invertColors：假，boldText：假，navigationMode：传统，gestureSettings：DeviceGestureSettings （touchSlop：8.0），显示功能：[]））：错误：无法在此 BlocBuilder Widget 之上找到正确的提供程序发生这种情况是因为您使用了不包含提供程序的 BuildContext 你的选择。有以下几种常见场景：您在main.dart中添加了一个新的提供程序并执行了热重载。要修复此问题，请执行热重启。您尝试阅读的提供商处于不同的路线。提供商具有“范围”。因此，如果您在路线中插入提供者，那么其他路线将无法访问该提供商。您使用了 BuildContext，它是您尝试读取的提供程序的祖先。确保 BlocBuilder 位于您的 MultiProvider/Provider 下。当您创建提供程序并尝试立即读取它时，通常会发生这种情况。例如，代替： Widget build(BuildContext context) { return Provider<Example>( create: (_) => Example(), // Will throw a ProviderNotFoundError, because `context` is associated // to the widget that is the parent of `Provider<Example>` child: Text(context.watch<Example>().toString()), ); } 考虑使用builder，如下所示： Widget build(BuildContext context) { return Provider<Example>( create: (_) => Example(), // we use `builder` to obtain a new `BuildContext` that has access to the provider builder: (context, child) { // No longer throws return Text(context.watch<Example>().toString()); } ); } 如果这些解决方案都不起作用，请考虑在 StackOverflow 上寻求帮助： https://stackoverflow.com/questions/tagged/flutter The relevant error-causing widget was: SafeArea SafeArea:file:///Users/../Projects/flutterTest/bloc_test/lib/main.dart:37:13 When the exception was thrown, this was the stack: #0 Provider._inheritedElementOf (package:provider/src/provider.dart:343:7) #1 Provider.of (package:provider/src/provider.dart:293:30) #2 ReadContext.read (package:provider/src/provider.dart:649:21) #3 _BlocBuilderBaseState.initState (package:flutter_bloc/src/bloc_builder.dart:130:36) #4 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:5602:55) #5 ComponentElement.mount (package:flutter/src/widgets/framework.dart:5447:5) ... Normal element mounting (4 frames) #9 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4326:16) #10 Element.updateChild (package:flutter/src/widgets/framework.dart:3831:20) #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #12 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #13 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #14 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #15 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #16 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #17 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #18 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #19 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #20 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #21 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #22 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #23 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #24 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #25 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #26 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #27 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #28 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #29 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #30 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #31 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #32 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #33 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #34 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #35 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #36 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #37 Element.updateChildren (package:flutter/src/widgets/framework.dart:3964:32) #38 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6896:17) #39 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #40 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #41 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #42 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #43 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #44 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #45 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #46 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #47 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #48 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #49 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #50 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #51 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #52 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #53 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #54 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #55 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #56 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #57 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #58 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #59 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #60 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #61 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #62 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #63 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #64 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #65 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #66 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #67 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #68 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #69 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #70 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #71 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #72 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #73 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #74 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #75 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #76 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #77 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #78 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #79 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #80 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #81 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #82 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #83 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #84 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #85 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #86 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #87 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #88 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #89 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #90 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #91 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #92 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #93 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #94 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #95 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #96 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #97 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #98 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #99 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #100 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #101 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #102 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #103 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #104 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #105 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #106 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #107 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #108 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #109 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2895:19) #110 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:984:21) #111 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:457:5) #112 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325:15) #113 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1255:9) #114 SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:978:7) #118 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12) (elided 3 frames from class _Timer and dart:async-patch) ==================================================================================================== 我不想使用像 MultiProvider 这样的全局提供程序。您应该在某处创建 InternetBloc 并提供它。 MultiProvider 本身并不是全局的，它只是多个。更多信息在这里：https://bloclibrary.dev/#/flutterbloccoreconcepts?id=blocprovider 所以，如果您不想使用全局提供程序，它将看起来像这样： class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(title), ), body: SafeArea( child: Center( child: BlocProvider<InternetBloc>( create: ( context) => InternetBloc(), child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, ), ), ), ), ); } } 要使用 BlocBuilder，您需要在 Widget 树中放置一个 BlocProvider。最佳实践是将其放置得尽可能深。在您的情况下，只需将 BlocProvider 放在 BlocBuilder 之上。此外 MultiProvider / MultiBlocProvider 不是全局 Provider。它只是一个提供多个 Provider/BlocProvider 的便捷小部件。 class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(title), ), body: SafeArea( child: Center( // Now everything below that can access the InternetBloc child: BlocProvider<InternetBloc>( create: (_) => InternetBloc(), child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, ), ), ), ), ); } }

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