大约有 23,000 项符合查询结果（耗时：0.0440秒） [XML]
Test if a command outputs an empty string
How can I test if a command outputs an empty string?
11 Answers
11
...
Check if list contains element that contains a string and get that element
...u should be able to use Linq here:
var matchingvalues = myList
.Where(stringToCheck => stringToCheck.Contains(myString));
If you simply wish to return the first matching item:
var match = myList
.FirstOrDefault(stringToCheck => stringToCheck.Contains(myString));
if(match != null)
...
Cleanest way to build an SQL string in Java
I want to build an SQL string to do database manipulation (updates, deletes, inserts, selects, that sort of thing) - instead of the awful string concat method using millions of "+"'s and quotes which is unreadable at best - there must be a better way.
...
add a string prefix to each value in a string column using Pandas
I would like to append a string to the start of each value in a said column of a pandas dataframe (elegantly).
I already figured out how to kind-of do this and I am currently using:
...
Collapse sequences of white space into a single character and trim string
...our favorite regexp library or use the following Cocoa-native solution:
NSString *theString = @" Hello this is a long string! ";
NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];
NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];
...
How to check if NSString begins with a certain character
How do you check if an NSString begins with a certain character (the character *).
10 Answers
...
How to use a variable to specify column name in ggplot
...
You can use aes_string:
f <- function( column ) {
...
ggplot( rates.by.groups, aes_string(x="name", y="rate", colour= column,
group=column ) )
}
as long as you pass the column to the func...
Sorting arraylist in alphabetical order (case insensitive)
I have a string arraylist names which contains names of people. I want to sort the arraylist in alphabetical order.
8 Ans...
How do you do Impersonation in .NET?
... = true, CharSet = CharSet.Unicode)]
internal static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, out IntPtr phToken);
This is the basic call definition, however there is a lot more to consider to actually using it in prod...
Python SQL query string formatting
I'm trying to find the best way to format an sql query string. When I'm debugging
my application I'd like to log to file all the sql query strings, and it is
important that the string is properly formated.
...