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Data binding to SelectedItem in a WPF Treeview
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The cast to TreeViewItem fails for me I assume because I am using a HierarchicalDataTemplate applied from resources by datatype. But if you remove ChangeSelectedItem, then binding to a viewmodel and retrieving the item works fine...
How to display gpg key details without importing it?
I have a copy of the postgresql apt repository gpg key and would like to view the details of the gpg key as it comes in the file. Is this possible without importing it into a key ring?
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Get size of all tables in database
...S SchemaName,
p.rows,
SUM(a.total_pages) * 8 AS TotalSpaceKB,
CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
SUM(a.used_pages) * 8 AS UsedSpaceKB,
CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS UsedSpaceMB,
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The apk must be signed with the same certificates as the previous version
I had uploaded my app to Google Play (back when it was called Android Market) some time ago.
11 Answers
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How does a PreparedStatement avoid or prevent SQL injection?
...g. But the input parameters will be sent to the database & appropriate cast/conversions will be applied prior to creating an actual SQL statement.
To give you an example, it might try and see if the CAST/Conversion works.
If it works, it could create a final statement out of it.
SELECT * Fr...
How to avoid overflow in expr. A * B - C * D
...ere's a work-around that only relies on implementation-defined behavior of casting unsigned integer to signed integer. But this can be expected to work on almost every system today.
(long long)((unsigned long long)A * B - (unsigned long long)C * D)
This casts the inputs to unsigned long long wher...
Swapping two variable value without using third variable
...ks for all integer values (that includes pointers then, with some luck and casting). For the sake of completeness I would like to mention another less powerful algorithm with addition/subtraction:
A = A + B
B = A - B
A = A - B
Here you have to be careful of overflows/underflows, but otherwise it ...
How does one generate a random number in Apple's Swift language?
...nteger between 0 and n-1.
let diceRoll = Int(arc4random_uniform(6) + 1)
Cast the result to Int so you don't have to explicitly type your vars as UInt32 (which seems un-Swifty).
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Covariance, Invariance and Contravariance explained in plain English?
...fferent generics parameters. Their relationships are the reason why we can cast them.
Co and Contra variance are pretty logical things. Language type system forces us to support real life logic. It's easy to understand by example.
Covariance
For instance you want to buy a flower and you have two ...
Calculating the difference between two Java date instances
...oid. Rounding errors exist. Example 19th to 21st May says 1 day because it casts 1.99 to 1. Use round before casting to int.
– Pratik Mandrekar
May 1 '13 at 14:51
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