大约有 42,000 项符合查询结果（耗时：0.0614秒） [XML]
How do I check if a type is a subtype OR the type of an object?
...
Here's the options:
Use Type.IsSubclassOf
Use Type.IsAssignableFrom
is and as
Type.IsSubclassOf
As you've already found out, this will not work if the two types are the same, here's a sample LINQPad program that demonstrates:
void Main()
{
typeof(Derived).IsSubclassOf(typeof(Base)).Dump(...
Will the base class constructor be automatically called?
...e -> Most Derived.
So in your particular instance, it calls Person(), and then Customer() in the constructor orders. The reason why you need to sometimes use the base constructor is when the constructors below the current type need additional parameters. For example:
public class Base
{
p...
How do I set default terminal to terminator? [closed]
...ize the comment above may not be very readable ... So: after I run the command, default terminal still shows up, eventhough terminator seems to be selected. No difference after reboot.
– Running Turtle
May 29 '13 at 10:15
...
Resharper- Find all unused classes
...w to find unused references of a single file by right clicking on the file and selecting the "Find Usages" option. Is there any way I can see or get the list of all the unused classes or files in my project ?
...
Add centered text to the middle of a -like line
...he compatibility is not that bad (you can add all of old flexbox syntaxes) and it degrades gracefully.
share
|
improve this answer
|
follow
|
...
How does one reorder columns in a data frame?
...mns like so df[,c(1,2,3,4)].
Note the first comma means keep all the rows, and the 1,2,3,4 refers to the columns.
To change the order as in the above question do df2[,c(1,3,2,4)]
If you want to output this file as a csv, do write.csv(df2, file="somedf.csv")
...
Is char signed or unsigned by default?
...
The book is wrong. The standard does not specify if plain char is signed or unsigned.
In fact, the standard defines three distinct types: char, signed char, and unsigned char. If you #include <limits.h> and then look at CHAR_MIN, you can find...
git reset --hard HEAD leaves untracked files behind
...'s supposed to reset to a pristine version of what you pulled, as I understand it. Unfortunately, it leaves files lying around, as a git status shows a big list of untracked files.
...
Is 0 a decimal literal or an octal literal?
...
Yes, 0 is an Octal literal in C++.
As per the C++ Standard:
2.14.2 Integer literals [lex.icon]
integer-literal:
decimal-literal integer-suffixopt
octal-literal integer-suffixopt
hexadecimal-literal integer-suffixopt
decimal-literal:
nonzero-digit ...
Remove insignificant trailing zeros from a number?
Have I missed a standard API call that removes trailing insignificant zeros from a number?
15 Answers
...