大约有 16,000 项符合查询结果（耗时：0.0404秒） [XML]
When to use in vs ref vs out
...eyword out instead of ref . While I (I think) understand the difference between the ref and out keywords (that has been asked before ) and the best explanation seems to be that ref == in and out , what are some (hypothetical or code) examples where I should always use out and not ref...
How do I map lists of nested objects with Dapper
I'm currently using Entity Framework for my db access but want to have a look at Dapper. I have classes like this:
7 Answer...
How to add Google Analytics Tracking ID to GitHub Pages
Could be a simple question but I am full of doubts right now about adding Google Analytics Tracking ID to GitHub page .
...
Call apply-like function on each row of dataframe with multiple arguments from each row
...
You can apply apply to a subset of the original data.
dat <- data.frame(x=c(1,2), y=c(3,4), z=c(5,6))
apply(dat[,c('x','z')], 1, function(x) sum(x) )
or if your function is just sum use the vectorized version:
rowSums(dat[,c('x','z')])
[1] 6 8...
Daemon Threads Explanation
...
Some threads do background tasks, like sending keepalive packets, or performing periodic garbage collection, or whatever. These are only useful when the main program is running, and it's okay to kill them off once the other, non-daemon, threads ...
How to change tab size on GitHub?
When I view files on GitHub, tabs appear as 8 spaces.
8 Answers
8
...
Why does comparing strings using either '==' or 'is' sometimes produce a different result?
I've got a Python program where two variables are set to the value 'public' . In a conditional expression I have the comparison var1 is var2 which fails, but if I change it to var1 == var2 it returns True .
...
With arrays, why is it the case that a[5] == 5[a]?
...
The C standard defines the [] operator as follows:
a[b] == *(a + b)
Therefore a[5] will evaluate to:
*(a + 5)
and 5[a] will evaluate to:
*(5 + a)
a is a pointer to the first element of the array. a[5] is the value that's 5 elements further from a, which is the same as *(...
How to wrap async function calls into a sync function in Node.js or Javascript?
Suppose you maintain a library that exposes a function getData . Your users call it to get actual data:
var output = getData();
Under the hood data is saved in a file so you implemented getData using Node.js built-in fs.readFileSync . It's obvious both getData and fs.readFileSync are sy...
Logging Clientside JavaScript Errors on Server [closed]
Im running a ASP.NET Site where I have problems to find some JavaScript Errors just with manual testing.
8 Answers
...