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scripting - What does $$ mean in the shell?

I once read that one way to obtain a unique filename in a shell for temp files was to use a double ... be suggested as a way to generate unique filenames. Question&Answers:os...

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.net - How can I add a hint text to WPF textbox?

For example, Facebook has a "Search" hint text in the Search text box when the textbox is empty. How to achieve this with WPF text boxes?? Question&Answers:os...

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ios - NSURLSession with NSBlockOperation and queues

I have an app that currently uses NSURLConnection for the vast majority of its networking. I would like to move to ... do such a thing in a different way? Question&Answers:os...

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java - Can I set a TTL for @Cacheable

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android - PopupMenu with icons

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android - Hide/Show bottomNavigationView on Scroll

I have to hide bottom navigation view on up scroll and show on down scroll .how to implement this? my ... have attached screenshot of view. Kindly check it. Question&Answers:os...

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Operator Overloading with C# Extension Methods

I'm attempting to use extension methods to add an operater overload to the C# StringBuilder class. Specifically, given ... s the proper way to go about it? Question&Answers:os...

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mysql - SQL order string as number

I have numbers saved as VARCHAR to a MySQL database. I can not make them INT due to some other depending ... can I make it appear ordered by numbers ascending? Question&Answers:os...

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ios - iPhone app in landscape mode, 2008 systems

Please note that this question is from 2008 and now is of only historic interest. What's the best ... ? Both programmatically and using the Interface Builder. Question&Answers:os...

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jquery - Mobile Safari: Javascript focus() method on inputfield only works with click?

I have a simple input field like this. <div class="search"> <input type="text" value="y u no work"/> </div> ... doesn't show up. I need the keyboard to show up. Question&Answers:os...

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sql - How can I introduce multiple conditions in LIKE operator?

I want to write an SQL statement like below: select * from tbl where col like ('ABC%','XYZ%','PQR%'); I ... But I want to know is there any better solution. Question&Answers:os...

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javascript - How to pass parameter to function using in addEventListener?

In the traditional way to add event listener: function getComboA(sel) { var value = sel.options[sel. ... output in the console, which is frustrating. Question&Answers:os...

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c# - Duplicate keys in .NET dictionaries?

Are there any dictionary classes in the .NET base class library which allow duplicate keys to be used? The only ... , but cannot find an analog in .NET. Question&Answers:os...

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jakarta ee - How to define servlet filter order of execution using annotations in WAR

If we define webapp specific servlet filters in WAR's own web.xml, then the order of execution of the filters ... how can we determine the order of execution? Question&Answers:os...

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.net - ITextSharp HTML to PDF?

I'd like to know if ITextSharp has the capability of converting HTML to PDF. Everything I will convert will just be ... document and convert it to a pdf? tia. Question&Answers:os...

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Implementing Profile Provider in ASP.NET MVC

For the life of me, I cannot get the SqlProfileProvider to work in an MVC project that I'm working on. The ... ASP.NET MVC projects? Thank you in advance... Question&Answers:os...

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android - Eclipse error "ADB server didn't ACK, failed to start daemon"

After updating the SDK, Eclipse shows this error: ADB server didn't ACK, failed to start daemon. When I run an ... can be executed. How can I fix this problem? Question&Answers:os...

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java - Spring Boot Adding Http Request Interceptors

What is the right way to add HttpRequest interceptors in spring boot application? What I want to do is ... those work with applicationcontext.xml. Please help. Question&Answers:os...

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Html List tag not working in android textview. What can I do?

Html List tag not working in android TextView. This is my string content: String str="A dressy take on classic gingham ... .loadData(str,"text/html","utf-8"); Question&Answers:os...

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mutex - How should I deal with mutexes in movable types in C++?

By design, std::mutex is not movable nor copyable. This means that a class A holding a mutex won't receive a ... make this type A movable in a thread-safe way? Question&Answers:os...

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android - Permission is only granted to system app

I have a System app that uses system permissions and I have those permissions listed in the manifest. Eclipse ... giving an error for a legit manifest file. Question&Answers:os...

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What is the best practice to parse html in swift?

I'm a Swift newbie. I need for something like Python's BeautifulSoup in Swift iOS project. Precisely, I need to ... ". What are the steps that I should take? Question&Answers:os...

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javascript - Replace words in the body text

Is there a way to replace the normal text within a table element that is placed within the body of the HTML ... "hi"? Please only use JavaScript without jQuery. Question&Answers:os...

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asp.net mvc - TempData keep() vs peek()

What is the difference between keep() and peek()? MSDN says: keep(): marks the specified key in the dictionary ... t they both keep a value for another request? Question&Answers:os...

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java - Reflection generic get field value

I am trying to obtain a field's value via reflection. The problem is I don't know the field's type and have ... = targetType.newInstance(); How can I do this? Question&Answers:os...

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How to use jQuery to call an ASP.NET web service?

I'm trying to use jQuery to get data from an ASP.NET web service (SharePoint Server 2007 lists.asmx), but ... really help as a first step in that direction. Question&Answers:os...

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postgresql - How to perform update operations on columns of type JSONB in Postgres 9.4

Looking through the documentation for the Postgres 9.4 datatype JSONB, it is not immediately obvious to me ... somewhere obvious that I missed? Thanks. Question&Answers:os...

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angular - Format date as dd/MM/yyyy using pipes

I'm using the date pipe to format my date, but I just can't get the exact format I want without a workaround. Am I ... ' this.date = new Date(); } } plnkr view Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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