大约有 16,000 项符合查询结果（耗时：0.0408秒） [XML]
Distinct not working with LINQ to Objects
...ues for the member fields).
One workaround is to implement the IEquatable interface as shown here.
If you modify your Author class like so it should work.
public class Author : IEquatable<Author>
{
public string FirstName { get; set; }
public string LastName { get; set; }
publi...
How do I check if a string is valid JSON in Python?
... #prints True
print is_json('{"foo":[5,6.8],"foo":"bar"}') #prints True
Convert a JSON string to a Python dictionary:
import json
mydict = json.loads('{"foo":"bar"}')
print(mydict['foo']) #prints bar
mylist = json.loads("[5,6,7]")
print(mylist)
[5, 6, 7]
Convert a python object to JSON str...
How to find if a given key exists in a C++ std::map
...
@goelakash hardly; it's just that count returns an int while find returns a whole iterator. You save the construction of the iterator :) Obviously, if you afterwards are going to use the value if it exists, use find and store its result.
– tomsmeding
...
Why use the SQL Server 2008 geography data type?
...lDegrees = 1
Begin
set @X = 1
END
Else
Begin
set @X = 24
End
-- convert to decimal degrees
set @Lat1 = @Latitude1 * @X
set @Long1 = @Longitude1 * @X
set @Lat2 = @Latitude2 * @X
set @Long2 = @Longitude2 * @X
-- convert to radians: radians = (degrees/180) * PI
set @Lat1 = (@Lat1 / 180) * @...
What requirement was the tuple designed to solve?
...therwise unrelated values without creating a type in only one way:
void M(int foo, string bar, double blah)
Logically this is exactly the same as a method M that takes one argument which is a 3-tuple of int, string, double. But I hope you would not actually make:
class MArguments
{
public in...
Why in Java 8 split sometimes removes empty strings at start of result array?
...on 7u40-b43 and 8-b132.
Java 7
public String[] split(CharSequence input, int limit) {
int index = 0;
boolean matchLimited = limit > 0;
ArrayList<String> matchList = new ArrayList<>();
Matcher m = matcher(input);
// Add segments before each match found
while(...
C# switch on type [duplicate]
... If you want a solution that works with sub-types, then at some point IsAssignableFrom will have to be used to make the comparison. This answer supports sub-types but its ussage is a little verbose
– sparebytes
Sep 17 '13 at 16:28
...
SqlException from Entity Framework - New transaction is not allowed because there are other threads
...loops were the culprits. What needs to happen is to call EF but return it into an IList<T> of that target type then loop on the IList<T>.
Example:
IList<Client> clientList = from a in _dbFeed.Client.Include("Auto") select a;
foreach (RivWorks.Model.NegotiationAutos.Client client...
What does the Ellipsis object do?
...hat can appear in slice notation. For example:
myList[1:2, ..., 0]
Its interpretation is purely up to whatever implements the __getitem__ function and sees Ellipsis objects there, but its main (and intended) use is in the numpy third-party library, which adds a multidimensional array type. Sinc...
Android notification is not showing
...k:
.setSmallIcon(R.drawable.icon)
Android Oreo (8.0) and above
Android 8 introduced a new requirement of setting the channelId property by using a NotificationChannel.
private NotificationManager mNotificationManager;
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(mConte...