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c# - Most efficient way to test equality of lambda expressions

Given a method signature: public bool AreTheSame<T>(Expression<Func<T, object>> exp1, Expression<Func<T, object>> exp2) ... => u2.ID); --> would return true Question&Answers:os...

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

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Function for Factorial in Python

How do I go about computing a factorial of an integer in Python? Question&Answers:os...

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

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c++ array - expression must have a constant value

I get an error when I try to create an array from the variables I declared. int row = 8; int col= 8; ... get this error: expression must have a constant value. Question&Answers:os...

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

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How to change chrome packaged app id Or Why do we need key field in the manifest.json?

I'm developing packaged app for chrome store using one-time chrome wallet payments. For my app I need to check ... item. key field is not allowed in manifest. Question&Answers:os...

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

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rust - When does a closure implement Fn, FnMut and FnOnce?

What are the specific conditions for a closure to implement the Fn, FnMut and FnOnce traits? That is: When does ... makes the compiler not implement Fn on it. Question&Answers:os...

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

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java - && (AND) and || (OR) in IF statements

I have the following code: if(!partialHits.get(req_nr).containsKey(z) || partialHits.get(req_nr).get(z) < tmpmap.get( ... and if a is true in the second case? Question&Answers:os...

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

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javascript - how to save canvas as png image?

I have a canvas element with a drawing in it, and I want to create a button that when clicked on, ... /mKm7BHmG68lGjO+0T Anyone know how to fix this? Question&Answers:os...

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

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javascript - How do I pass the this context to a function?

I thought this would be something I could easily google, but maybe I'm not asking the right question... How do I ... -specific way of doing it, that'd be ideal. Question&Answers:os...

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

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MySQL select one column DISTINCT, with corresponding other columns

ID FirstName LastName 1 John Doe 2 Bugs Bunny 3 John Johnson I want to select DISTINCT results from the FirstName column, ... an ID of 1 and a LastName of Doe. Question&Answers:os...

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

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SQL Server Escape an Underscore

How do I escape the underscore character? I am writing something like the following where clause and want to be able ... at the end. Where Username Like '%_d' Question&Answers:os...

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

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Android WebView progress bar

I have looked at a question similar to this here but as I am a newbie could someone explain how to get this to ... time delay so people know that it's loading? Question&Answers:os...

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

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garbage collection - Does setting Java objects to null do anything anymore?

I was browsing some old books and found a copy of "Practical Java" by Peter Hagger. In the performance ... obsolete programming advice or is it still useful? Question&Answers:os...

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

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exception - ASP.NET custom error page - Server.GetLastError() is null

I have a custom error page set up for my application: <customErrors mode="On" defaultRedirect="~/errors/GeneralError.aspx" / ... .cs ? ASP.NET 3.5 on Vista/IIS7 Question&Answers:os...

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

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php - POST an array from an HTML form without javascript

This question already has answers here: Question&Answers:os...

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

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javascript - How to offset the center point in Google maps api V3

I have a Google map with a semi transparent panel covering a portion of the area. I would like to adjust the ... be at the offset position. Thanks in advance! Question&Answers:os...

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

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781 views

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cors - What is an opaque response, and what purpose does it serve?

I tried to fetch the URL of an old website, and an error happened: Fetch API cannot load http://xyz. No ' ... What's the purpose then, of an opaque response? Question&Answers:os...

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

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java - EL access a map value by Integer key

I have a Map keyed by Integer. Using EL, how can I access a value by its key? Map<Integer, String> map = ... a EL notation to access a map by an Integer value? Question&Answers:os...

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

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549 views

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python - Fast way of counting non-zero bits in positive integer

I need a fast way ... Question&Answers:os...

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

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rounding - Round to 5 (or other number) in Python

Is there a built-in function that can round like the following? 10 -> 10 12 -> 10 13 -> 15 14 -> 15 16 -> 15 18 -> 20 Question&Answers:os...

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

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java - Secure HTTP Post in Android

I have a pretty basic helper class that I'm using to do all my Http Get/Post stuff. I'm using ... schReg); return new DefaultHttpClient(conMgr, params); } Question&Answers:os...

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

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regex - How to find indices of all occurrences of one string in another in JavaScript?

I'm trying to find the positions of all occurrences of a string in another string, case-insensitive. For example, given ... to be a more concise way to do it? Question&Answers:os...

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

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c++ - unresolved external symbol __imp__fprintf and __imp____iob_func, SDL2

Could someone explain what the __imp__fprintf and __imp____iob_func unresolved external means? Because I get these errors ... the VC++ Directories are correct. Question&Answers:os...

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

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distutils - Including non-Python files with setup.py

How do I make setup.py include a file that isn't part of the code? (Specifically, it's a license file, ... regardless of operating system. How do I do that? Question&Answers:os...

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

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Null vs. False vs. 0 in PHP

I am told that good developers can spot/utilize the difference between Null and False and 0 and all the other good " ... Does it have something to do with ===? Question&Answers:os...

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

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wpf - MVVM Passing EventArgs As Command Parameter

I'm using Microsoft Expression Blend 4 I have a Browser .., [ XAML ] ConnectionView " Empty Code Behind ... as Command Parameters when Navigated Event occurs ? Question&Answers:os...

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

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android - Find distance between two points on map using Google Map API V2

I am using google map api v2 in my android application, I am able to show the map and put markers on it, ... knows how to solve this then please help me. Thanks Question&Answers:os...

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

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151 views

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Function Pointers in Java

This may be something common and trivial, but I seem to be having trouble finding a concrete answer. In C# there ... be clear, we're talking first class here. Question&Answers:os...

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

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In C, how should I read a text file and print all strings

I have a text file named test.txt I want to write a C program that can read this file and print the content to ... be larger than that. How can I solve this? Question&Answers:os...

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

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