大约有 44,000 项符合查询结果（耗时：0.0403秒） [XML]
How to query nested objects?
...ndividual fields in the subdocument:
Equality matches within subdocuments select documents if the subdocument matches exactly the specified subdocument, including the field order.
In the following example, the query matches all documents where the value of the field producer is a subdocument tha...
Are there any side effects of returning from inside a using() statement?
...nCreated descending
where t.Id == singleId
select t).SingleOrDefault();
}
}
Indeed, I might even be tempted to use dot notation, and put the Where condition within the SingleOrDefault:
public static Transaction GetMostRecentTransaction(int singleId)
{
using...
What is this 'Lambda' everyone keeps speaking of?
... without bloating your code unnecessarily. For example, in Ruby:
(1..100).select {|num| num % 2 == 0}
This will create an array containing the even numbers between 1 and 100. We don't have to write out an explicit loop — the select method takes a function that it uses to test the values, so all...
Why does this async action hang?
...DBConnection.ExecuteAsync<ResultClass>(
ds => ds.Execute("select slow running data into result"));
}
What's the difference? There's now no awaiting anywhere, so nothing being implicitly scheduled to the UI thread. For simple methods like these that have a single return, there's no...
Best way to do Version Control for MS Excel
...to run these macros. In the code viewer, right click on "ThisWorkbook" and select "View Code". You may have to pull down the select box at the top of the code window to change from "(General)" view to "Workbook" view.
Contents of "Workbook" view:
Private Sub Workbook_Open()
ImportCodeModules
End...
How can I auto increment the C# assembly version via our CI platform (Hudson)?
...d an existing item to you project (wait... read on before adding the file)
Select the file and before you click Add, click the dropdown next to the add button and select "Add As Link".
Repeat steps 5 and 6 for all existing and new projects in the solution
When you add the file as a link, it stores...
DateTime2 vs DateTime in SQL Server
...= '5/5/2010 23:59:59.999'
declare @d3 datetime = '5/5/2010 23:59:59.997'
select @d1 as 'IAmMay6BecauseOfRounding', @d2 'May5', @d3 'StillMay5Because2msEarlier'
Avoiding this implicit rounding is a significant reason to move to DateTime2. Implicit rounding of dates clearly causes confusion:
St...
Android 4.3 Bluetooth Low Energy unstable
... I have a work around for being unable to unpair. 1) go to your bt menu, select unpair, remove the ble device from the area or depower it, select the ble device in the bt menu and it'll try to pair and fail, then reset bluetooth. Upon reset the device will be unpaired.
– Chr...
Remote debugging a Java application
...ugger for remote debugging:
Eclipse Settings:
1.Click the Run Button
2.Select the Debug Configurations
3.Select the “Remote Java Application”
4.New Configuration
Name : GatewayPortalProject
Project : GatewayPortal-portlet
Connection Type: Socket Attach
Connection Properties:
i) localhos...
What is a software framework? [closed]
...an abstraction in which common code providing generic functionality can be selectively overridden or specialized by user code providing specific functionality. Frameworks are a special case of software libraries in that they are reusable abstractions of code wrapped in a well-defined Application pro...