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Linq 多字段排序，二次排序 - .NET(C#) - 清泛IT论坛，有思想、有深度
Linq：ordered = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );
类似SQL：select * from t1 order by f1 desc ,f2 asc
这种写法里 OrderBy、ThenBy 是升序的，OrderByDescending、ThenByDescending 是降序的。
Android static object lifecycle
...vity
state so that on restart, the fields
get filled with their previously
selected values, you can implement
the onSaveInstanceState() activity
method - note that this is not
recommended for between activities
persistance of states.
You can get some code examples of the usage of preferences, inte...
How do I check if the mouse is over an element in jQuery?
...
exactly - this should be the selected answer! Anyway, here is a fiddle for it jsfiddle.net/mathheadinclouds/ZKGqe
– mathheadinclouds
May 11 '13 at 20:38
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Is there a NumPy function to return the first index of something in an array?
...st element. Note also that where and nonzero return arrays, so you need to select the first element to get the index.
In [71]: np.argmax(a==2)
Out[71]: 2
In [72]: np.where(a==2)
Out[72]: (array([2], dtype=int64),)
In [73]: np.nonzero(a==2)
Out[73]: (array([2], dtype=int64),)
Time comparison
Ju...
Gradle - getting the latest release version of a dependency
... + for the version, and want to know which version is actually being used, select Project in the sidebar, and then under External Libraries you will see the actual version number in use.
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How to change the name of a Django app?
...ete the permissions: delete from auth_permission where content_type_id in (select id from django_content_type where app_label = '<OldAppName>')
Delete content types: delete from django_content_type where app_label = '<OldAppName>'
Rename the folder of the app.
Change any references to y...
Debug vs Release in CMake
... CXX)
Would compile .c files with g++. The link above also shows how to select a specific compiler for C/C++.
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Performing Inserts and Updates with Dapper
...anager.ConnectionStrings["myDbConnection"].ConnectionString))
{
string selectQuery = @"SELECT * FROM [dbo].[Customer] WHERE FirstName = @FirstName";
var result = db.Query(selectQuery, new
{
customerModel.FirstName
});
}
Code for CRUD:
using (IDbConnection db = new SqlConn...
Eclipse/Java code completion not working
...heir name)
The Eclipse help page defines the default list to restore:
Select the proposal kinds contained in the 'default' content assist list:
Other Java Proposals,
SWT Template Proposals,
Template Proposals,
Type Proposals
...
Xcode: issue “file xxx.png is missing from working copy” at project building
...te worked for me. When I added some new images, I actually had to manually select "add" on the 2x/3x variants in the File Inspector pane as well. Weird.
– Android3000
Mar 24 '16 at 17:22
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