大约有 16,000 项符合查询结果（耗时：0.0451秒） [XML]
ThreadStatic v.s. ThreadLocal: is generic better than attribute?
...ery thread. For example, say you have this:
[ThreadStatic]
private static int Foo = 42;
The first thread that uses this will see Foo initialized to 42. But subsequent threads will not. The initializer works for the first thread only. So you end up having to write code to check if it's initialized...
What difference is there between WebClient and HTTPWebRequest classes in .NET?
...ebRequest. Normally, you would use WebRequest to, well, make a request and convert the return to either HttpWebRequest, FileWebRequest or FtpWebRequest, depend on your request. Below is an example:
Example:
var _request = (HttpWebRequest)WebRequest.Create("http://stackverflow.com");
var _response ...
What is the difference between exit() and abort()?
...wing an exception that is caught in main().
struct exit_exception {
int c;
exit_exception(int c):c(c) { }
};
int main() {
try {
// put all code in here
} catch(exit_exception& e) {
exit(e.c);
}
}
Instead of calling exit(), arrange that code throw exit_e...
How do I analyze a program's core dump file with GDB when it has command-line parameters?
...clude <stdio.h>
#include <stdlib.h>
#include <string.h>
int myfunc(int i) {
*(int*)(NULL) = i; /* line 7 */
return i - 1;
}
int main(int argc, char **argv) {
/* Setup some memory. */
char data_ptr[] = "string in data segment";
char *mmap_ptr;
char *text_pt...
What is the worst gotcha in C# or .NET? [closed]
...
private int myVar;
public int MyVar
{
get { return MyVar; }
}
Blammo. Your app crashes with no stack trace. Happens all the time.
(Notice capital MyVar instead of lowercase myVar in the getter.)
...
Why can't I declare static methods in an interface?
...hat is the reason for the fact that static methods can't be declared in an interface?
14 Answers
...
Swapping column values in MySQL
...to be present.
This is my test schema:
CREATE TABLE `swap_test` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`x` varchar(255) DEFAULT NULL,
`y` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
INSERT INTO `swap_test` VALUES ('1', 'a', '10');
INSERT INTO `swap_test` VALUES ('2', N...
String.IsNullOrWhiteSpace in LINQ Expression
...sitor = new QueryVisitor();
return queryable.Where(visitor.VisitAndConvert(where, "WhereEx"));
}
}
So if you run myqueryable.WhereEx(c=> !c.Name.IsNullOrWhiteSpace()) it will be converted to !(c.Name == null || x.Trim() == "") before being passes to whatever (linq to sql/entities) a...
How would you count occurrences of a string (actually a char) within a string?
...
If you're using .NET 3.5 you can do this in a one-liner with LINQ:
int count = source.Count(f => f == '/');
If you don't want to use LINQ you can do it with:
int count = source.Split('/').Length - 1;
You might be surprised to learn that your original technique seems to be about 30%...
Which is faster: while(1) or while(2)?
This was an interview question asked by a senior manager.
23 Answers
23
...