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Nullable types and the ternary operator: why is `? 10 : null` forbidden? [duplicate]
... (int?)null;
Basically what is happening is that conditional operator is unable to determine the "return type" of the expression. Since the compiler implictitly decides that 10 is an int it then decides that the return type of this expression shall be an int as well. Since an int cannot be null...
Nginx与Lua - 更多技术 - 清泛网 - 专注C/C++及内核技术
...着把两条指令的顺序交换一下，会发现程序依然能够正常运行。
下面我们尝试结合Redis写个更实战一点的例子。
首先，我们需要创建一个Redis配置文件config.json，内容如下：
{
"host": "<HOST>",
"port": "<PORT>"
}
然后，我们...
How to insert a value that contains an apostrophe (single quote)?
... identifier). Until last year when somebody told me his password and I was unable to login in to his system. we could not figure out until hours that I am typing ' as `.
– Learner
Apr 11 '19 at 8:48
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get UTC time in PHP
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@bksi I'm unable to repeat your described behaviour. (My machine is not on GMT and my UNIX timestamps are correct. Also gmdate("U") == time().) Sounds like potentially buggy behaviour. Double check and file a bug with the PHP project.
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NPM clean modules
...path.join(process.cwd(), packageFileName))) {
console.log(util.format("Unable to find file '%s'.", packageFileName));
process.exit();
}
deleteFolder(path.join(process.cwd(), modulesDirName));
process.env.npm_config_cache = cacheDirectory;
downloadSource(process.cwd());
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Is Tomcat running?
...e installed Tomcat8 on Ubuntu, but going to localhost:8080 results in the "Unable to connect" message.
– ibodi
Aug 9 '18 at 12:18
1
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Convert JSON string to dict using Python
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When I started using json, I was confused and unable to figure it out for some time, but finally I got what I wanted
Here is the simple solution
import json
m = {'id': 2, 'name': 'hussain'}
n = json.dumps(m)
o = json.loads(n)
print(o['id'], o['name'])
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How to reset Android Studio
...ig\port.lock" file, no need to reset if some one facing crash in studio or unable load the recent projects
– Syed Raheem Uddin
Feb 8 '17 at 12:34
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Reopen last closed tab in Visual Studio
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Simple and good enough for "classical" files but unable to reopen other tabs like source control explorer for instance.
– Gregory_Ott
Aug 14 '18 at 9:08
3...
get name of a variable or parameter [duplicate]
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This doesn't seem to work for me... {"Unable to cast object of type 'System.Linq.Expressions.TypedConstantExpression' to type 'System.Linq.Expressions.MemberExpression'."}
– weberc2
Nov 29 '12 at 19:12
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