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drop down menu - Create custom dropdown in flutter - or how to put custom dropdown options in a layer above everything else

I am looking for a way to create a custom dropdown so I can style it myself. I ran into this answer that seems pretty ... { optionItemSelected = optionItem; setState(() { }); }, ))...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Using EF Core HasQueryFilter in entity configuration to map nullable db columns to non-nullable properties?

The Setup: In an MS SQL Server database (note: managed by an external provider, we cannot change the ... transparently handle this case via the entity type builder configuration....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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json.net - Issue with serializing 'object' with System.Text.Json

I need to store an unknown JSON structure from an external API, but when I serialize the data using System.Text.Json, ... from Newtonsoft.Json, but I don't fully understand it....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - How can i retrieve a specific data from a firebase child node into Adnroid studio

referenc2= FirebaseDatabase.getInstance().getReference("messageCounter").child("node"); referenc2.addValueEventListener(new ... variable in android studio. can anyone help?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Why does my Selenium URL_to_be statement not work?

Selenium does not seem to register that I manually go to the publish0x.com page. Does anyone know a solution? My ... slider = driver.find_element_by_xpath('//*[@id="tipslider"]')...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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signals - GnuRadio w/ LimeSDR IQ Splitter Phase Shift

The following flowgraph implements an IQ splitter. My doubt lies on the complex to float block, where Real and Imag parts ... process will be handed over on the Rx side. Flowgraph:...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# adding list<string> to each cell in column google sheets api

I have a list of string with data. My mission is simple: need to write data from list to rows starts with A2 ... TimeSpan.FromSeconds(1) > DateTime.Now); appendRequest.Execute(); }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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user interface - Mitigate issues in UI building with low-code?

It's Eugenia from UI Bakery, a low-code UI builder. My team and I are running a survey focused on: - IT outsourcing ... and find a way to simplify the process for you! Win-win....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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r - Is there a way to fix errata in Rdocumentation.org?

I use R pretty often and I have noticed that while checking any package's documentation at RDocumentation.org, some pages ... find any way to contact the website team. Any ideas?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Insert a json object into another in a nested level by using JsonCpp

Using JsonCpp, I want to create a function insert_json declared as void insert_json(Json::Value& base, const Json:: ... ? Is there any easy alternative with another json library?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Python要怎样用一行代码逆序输出自己本身的代码

Python可以用一行代码逆序输出自己本身的代码么...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Android path in the Fileprovider is not recognised

I get this following exception for xlsx, msg and xml Caused by java.lang.IllegalArgumentException: Failed to find ... the bug because do not understand where is going wrong...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Is there a way in Playwright to select a specific button inside a dynamic table?

I'm new in developing and I'm facing a real problem with the creation of one e2e test. Basically, I have a table ... a variable 2 - Click on the button contained in the saved row...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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MySQL：关于 MDL 的读锁与写锁

Session A 与 Session B 均持有【MDL 读锁】，读锁间不互斥，故可同时读取表 T，由于 session A 持有的【MDL 读锁】尚未释放，致使 Session C 因无法获取【MDL 写锁】而阻塞，由于 Session D ... 为无法获取【MDL 写锁】，那 Session D 请求【MDL 读锁】也不行也会被阻塞，这是什么机制呢?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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tomcat - Removing specific algorithms from Java security providers

I have a tomcat 7.x servlet container which deploys multiple war files from its webapps directory. I would like to ... since I removed MessageDigest.MD5. What could be the reason?...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Clickhouse External Dictionary not loading

I've created an external cache dictionary which I load on start by setting dictionaries_lazy_load as False. The external ... </attribute> </structure> </dictionary> </yandex>...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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React组件通信?

有这样一个组件数结构，如何实现当B执行某个方法之后，触发D中的某个方法\\(由B通知A，再由A层层往下调用不考虑\\)?或者说这个组件结构本身是否存在问题？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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关于Redis持久化的一个问题思考?

下图是Redis持久化，RDB方式的一个原理图 1.在执行bgsave的时候，会fork一个子进程 2.子进程根据父进程的内存数据创建一个临时快照 3.子进程创建完临时快照之后，会通知父进程此时父进程会更新持久化的信息 4.这时候 ... 操作？ 2.在子进程创建临时快照的过程中，由于父进程还在响应新的命令，此时的新命令是如何处理到新的rdb文件？...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Creating two value range slider from Angular material native component

I need a two value range slider for my app, however none of the packages that I've looked at on NPM etc are 100% suitable ... background { background-color: rgba(0, 0, 0, 0.26); }...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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VueCli3.x 设置 publicPath 后本地访问被代理到测试环境？

我的需求：默认在本地启动项目是 localhost:8080，由于后端cookie设置在子路径下，所以我想给它在本地配置个子域名，比如：localhost:8080/subpath 我的做法：所以我在 vue.config.js 中添加了： module. ... /', // ... } 我的问题：本地访问配置的 url 后被代理到测试环境了......

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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react-native、flutter 有没视频编辑插件

有没相关依赖包推荐呢？求大佬安利...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.6k views

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python - kaprekar numbers

def kaprekar_num(num): count = 0 while count <= num: n = 1 sqr = n ** 2 digits = str(sqr) length = len(digits) for ... , Left: 98 + Right: 1 = 99 I will appreciate some insights :)...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Xamarin Forms Android Ad-Hoc apk update There was a problem parsing the package

Trying to create an android autoupdater for an ahoc app in Xamarin forms. here is my code and manifest and paths xml. The app ... ="." /> </paths> ``` Thanks in advance guys!...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue 父组件向子组件传值，子组件watch props，console.log 触发两次

父组件? 子组件? 子组件监听? 不知道哪里出现了问题...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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es库的全文检索字段怎么搜索一个不分开的词组？

全文搜索的字段，如果想要查询一个用空格分开的词组，例如： Gritty Hope'，使用什么样的es库查询语句，能达到查询出来的结果必须都包含这个词组，就是说，只包含 Gritty'或 ... "title": "Raymond James Keeps a Hold Rating on Hope Bancorp (HOPE)" } 这两条查询不出来 ...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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debugging - C# Blazor Webassembly custom authorize attribute not working debug

I found a problem with the authorization attributes in the blazor. I wrote a class for working with ... create-a-custom-authorizeattribute-that-accepts-parameters-of-type-enum...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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您如何用Java 8 Instant表示MS-DTYP`DATETIME`？

在Microsoft Spec中，DATETIME表示为2个32位整数：low和high 参考：https : [](https://docs.microsoft.com/en...//docs.microsoft.com/zh- cn/openspecs/ ... 和低=552794112 如何将这些计算到Java 8 Instant？问题和答案在这里...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue登录页面登陆两次问题 /?#

vue登录页面登陆两次问题 /? 1.启动服务后，跳转 [http://192.168.0.108:8080/] 2.然后输入正确的用户名和密码 ![第1,2步](/img/bVcHQZ9) ... : pointer; } .s-canvas canvas { margin-top: 1px; margin-left: 8px; } </style>...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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