大约有 23,000 项符合查询结果（耗时：0.0380秒） [XML]
Select Multiple Fields from List in Linq
...ake it a KeyValuePair, so it will return a "IEnumerable<KeyValuePair<string, string>>"
So, it will be like this:
.Select(i => new KeyValuePair<string, string>(i.category_id, i.category_name )).Distinct();
...
Iterate keys in a C++ map
...e <iostream>
#include <map>
int main()
{
std::map<std::string, int> myMap;
myMap["one"] = 1;
myMap["two"] = 2;
myMap["three"] = 3;
for ( const auto &myPair : myMap ) {
std::cout << myPair.first << "\n";
}
}
...
convert streamed buffers to utf8-string
...
Single Buffer
If you have a single Buffer you can use its toString method that will convert all or part of the binary contents to a string using a specific encoding. It defaults to utf8 if you don't provide a parameter, but I've explicitly set the encoding in this example.
var req = ...
PreparedStatement with list of parameters in a IN clause [duplicate]
...a "?" for each possible value.
For instance:
List possibleValues = ...
StringBuilder builder = new StringBuilder();
for( int i = 0 ; i < possibleValue.size(); i++ ) {
builder.append("?,");
}
String stmt = "select * from test where field in ("
+ builder.deleteCharAt( buil...
What is the difference between .text, .value, and .value2?
...
.Text gives you a string representing what is displayed on the screen for the cell. Using .Text is usually a bad idea because you could get ####
.Value2 gives you the underlying value of the cell (could be empty, string, error, number (double...
Is there a “null coalescing” operator in JavaScript?
... coalescing operator (??) is using a logical OR (||):
var whatIWant = someString || "Cookies!";
There are cases (clarified below) that the behaviour won't match that of C#, but this is the general, terse way of assigning default/alternative values in JavaScript.
Clarification
Regardless of th...
Get characters after last / in url
...
Seems to work fine, It's a string function; it doesn't check if the path exists.
– Gifford N.
Mar 24 '16 at 17:06
add a comment...
Android preferences onclick event
...etter, especially because it doesn't use the now deprecated findPreference(String key) method and because it's just cleaner overall.
– lyallcooper
Jun 4 '13 at 0:00
...
How do I find all files containing specific text on Linux?
...d a way to scan my entire Linux system for all files containing a specific string of text. Just to clarify, I'm looking for text within the file, not in the file name.
...
Why can I type alias functions and use them without casting?
...amed types.
Named types are types with a name, such as int, int64, float, string, bool. In addition, any type you create using 'type' is a named type.
Unnamed types are those such as []string, map[string]string, [4]int. They have no name, simply a description corresponding to how they are to be st...