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Disable Required validation attribute under certain circumstances
...asses that are specifically tailored to the needs of a given view. So for example in your case you could have the following view models:
public UpdateViewView
{
[Required]
public string Id { get; set; }
... some other properties
}
public class InsertViewModel
{
public string Id { ...
Pickle or json?
...Python object serialization.
If you want interoperability or you want a text format to store your data, go with JSON (or some other appropriate format depending on your constraints).
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Escape a string for a sed replace pattern
In my bash script I have an external (received from user) string, which I should use in sed pattern.
14 Answers
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How can I force division to be floating point? Division keeps rounding down to 0?
...representing one). If you might be dealing with other types (such as complex numbers) you'll need to either check for those or use a different method.
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How can I get a count of the total number of digits in a number?
...ow can I get a count of the total number of digits of a number in C#? For example, the number 887979789 has 9 digits.
16 An...
How can I check whether a radio button is selected with JavaScript?
I have two radio buttons within an HTML form. A dialog box appears when one of the fields is null. How can I check whether a radio button is selected?
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Read password from stdin
...th binaries in other language, in particular C, hence leveraging a lot of existing stuff (such as getpass(), I believe)
– mjv
Nov 19 '09 at 8:35
2
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Merge PDF files
...ython
import sys
try:
from PyPDF2 import PdfFileReader, PdfFileWriter
except ImportError:
from pyPdf import PdfFileReader, PdfFileWriter
def pdf_cat(input_files, output_stream):
input_streams = []
try:
# First open all the files, then produce the output file, and
# f...
How do I pick randomly from an array?
...ould require "backports/1.9.1/array/sample".
Note that in Ruby 1.8.7 it exists under the unfortunate name choice; it was renamed in later version so you shouldn't use that.
Although not useful in this case, sample accepts a number argument in case you want a number of distinct samples.
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How to Generate unique file names in C#
...n't matter, use GUIDs.
E.g.:
var myUniqueFileName = string.Format(@"{0}.txt", Guid.NewGuid());
or shorter:
var myUniqueFileName = $@"{Guid.NewGuid()}.txt";
In my programs, I sometimes try e.g. 10 times to generate a readable name ("Image1.png"…"Image10.png") and if that fails (because the f...