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What is Data Transfer Object?
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A Data Transfer Object is an object that is used to encapsulate data, and send it from one subsystem of an application to another.
DTOs are most commonly used by the Services layer in an N-Tier application to transfer data between itself and the UI layer. The main benefit here is that it reduc...
Are there any suggestions for developing a C# coding standards / best practices document? [closed]
... 'adopter' in the department) to create a basic (read useful?) C# coding standards document.
26 Answers
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append new row to old csv file python
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I prefer this solution using the csv module from the standard library and the with statement to avoid leaving the file open.
The key point is using 'a' for appending when you open the file.
import csv
fields=['first','second','third']
with open(r'name', 'a') as f:
writer...
How to create an AVD for Android 4.0
Android 4.0 is now released. I have just updated my ADT plugin and downloaded the 4.0 SDK. But when I try to create an AVD for Android 4.0, Eclipse tells me 'Unable to find a 'userdata.img' file for ABI armeabi to copy into the AVD folder'.
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Why covariance and contravariance do not support value type
...or not.
You might want to read Eric Lippert's blog post on representation and identity for more on this topic in general.
EDIT: Having reread Eric's blog post myself, it's at least as much about identity as representation, although the two are linked. In particular:
This is why covariant and ...
What Makes a Method Thread-safe? What are the rules?
...ere overall rules/guidelines for what makes a method thread-safe? I understand that there are probably a million one-off situations, but what about in general? Is it this simple?
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Can I use a hash sign (#) for commenting in PHP?
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The answer to the question Is there any difference between using "#" and "//" for single-line comments in PHP? is no.
There is no difference. By looking at the parsing part of PHP source code, both "#" and "//" are handled by the same code and therefore have the exact same behavior.
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Determining if a number is either a multiple of ten or within a particular set of ranges
...m - 1) / 10) % 2 == 1 && num <= 100)
But that's rather dense, and you might be better off just listing the options explicitly.
Now that you've given a better idea of what you are doing, I'd write the second one as:
int getRow(int num) {
return (num - 1) / 10;
}
if (ge...
Do spurious wakeups in Java actually happen?
Seeing various locking related question and (almost) always finding the 'loop because of spurious wakeups' terms 1 I wonder, has anyone experienced such kind of a wakeup (assuming a decent hardware/software environment for example)?
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How to check file input size with jQuery?
I have a form with file upload capabilities and I would like to be able to have some nice client side error reporting if the file the user is trying to upload is too big, is there a way to check against file size with jQuery, either purely on the client or somehow posting the file back to the server...