Does .NET framework have a collection of icons for use in Windows Forms or WPF application somewhere? How does one use it? For example, how do I use it as an application window icon? 

I recall, if you want to display a message box there is a choice to show different icons, I suppose there are more icons in the framework?



Does .NET have icon collections?

In an MVC project I&#39;m creating I have the following `RequirePermissionAttribute` that gets put on any action that needs specific permissions (it&#39;s been simplified for this example):

    public class RequirePermissionAttribute : ActionFilterAttribute, IAuthorizationFilter
    {
        public Operation Permissions { get; set; }

        public RequirePermissionAttribute() { }

        public RequirePermissionAttribute(Operation permissions)
        {
            this.Permissions = permissions;
        }

        public bool AuthorizeCore(HttpContextBase httpContext)
        {
            IAuthorizationService authServ = new ASPNETAuthorizationService();
            return authServ.Authorize(httpContext);
        }

        public void OnAuthorization(AuthorizationContext filterContext)
        {
            Enforce.ArgNotNull(filterContext);

            if (this.AuthorizeCore(filterContext.HttpContext))
            {
                // code snipped.
            }
            else
            {
                // code snipped.
            }
        }
    }

So the problem obviously with this is that my authorize attribute has a dependency on the `ASPNETAuthorizationService` that I created. I can&#39;t go the constructor way since attributes are compile-time checked.

One thing to mention, I&#39;m using my own little IoC that I made and it doesn&#39;t have support for property injection (yet). Of course, if I did go the property injection route, I&#39;d have to add support for it (which I&#39;d have to do some research on).

What&#39;s the best way to inject something into an attribute class?

How to use dependency injection with an attribute?

I have written the following code, which should check if the entered number is a prime number or not, but there is an issue I couldn&#39;t get through:

    def main():
        n = input(&quot;Please enter a number:&quot;)
        is_prime(n)

    def is_prime(a):
        x = True
        for i in (2, a):
                while x:
                   if a%i == 0:
                       x = False
                   else:
                       x = True


        if x:
            print(&quot;prime&quot;)
        else:
            print(&quot;not prime&quot;)

    main()

If the entered number is not a prime number, it displays &quot;not prime&quot;, as it is supposed to, but if the number is a prime number, it doesn&#39;t display anything. How can I fix this?





Checking if a number is prime in Python

I have written the following code, which should check if the entered number is a prime number or not, but there is an issue I couldn't get through:
<pre><code class="hljs language-python">def main():
 n = input("Please enter a number:")
 is_prime(n)

def is_prime(a):
 x = True
 for i in (2, a):
 while x:
 if a%i == 0:
 x = False
 else:
 x = True


 if x:
 print("prime")
 else:
 print("not prime")

main()
</code></pre>
If the entered number is not a prime number, it displays "not prime", as it is supposed to, but if the number is a prime number, it doesn't display anything. How can I fix this?

I was wondering if any OData Python libraries are available to produce and consume OData?
There are implementations for different languages:
http://www.odata.org/libraries/

But I couldn&#39;t find Python so far. I don&#39;t mean IronPython by the way. The library should be just usable in Python.

OData Python Library available?

I&#39;m currently teaching myself Python and was just wondering (In reference to my example below) in simplified terms what the `sys.argv[1]` represents. Is it simply asking for an input?

    #!/usr/bin/python3.1
    
    # import modules used here -- sys is a very standard one
    import sys
    
    # Gather our code in a main() function
    def main():
      print (&#39;Hello there&#39;, sys.argv[1])
      # Command line args are in sys.argv[1], sys.argv[2] ..
      # sys.argv[0] is the script name itself and can be ignored
    
    # Standard boilerplate to call the main() function to begin
    # the program.
    if __name__ == &#39;__main__&#39;:
      main()

sys.argv[1] meaning in script

I have written a view which responds to ajax requests from browser. It&#39;s written like so - 

    @login_required
    def no_response(request):
        params = request.has_key(&quot;params&quot;)
        if params:
            # do processing
            var = RequestContext(request, {vars})
            return render_to_response(&#39;some_template.html&#39;, var)
        else: #some error
            # I want to send an empty string so that the 
            # client-side javascript can display some error string. 
            return render_to_response(&quot;&quot;) #this throws an error without a template.

How do i do it?


Here&#39;s how I handle the server response on client-side - 

        $.ajax
        ({
            type     : &quot;GET&quot;,
            url      : url_sr,
            dataType : &quot;html&quot;,
            cache    : false,
            success  : function(response)
            {
                if(response)
                    $(&quot;#resp&quot;).html(response);
                else
                    $(&quot;#resp&quot;).html(&quot;&lt;div id=&#39;no&#39;&gt;No data&lt;/div&gt;&quot;);
            }
        });


How do I send empty response in Django without templates

How can I open a file, Stud.txt, and then replace any occurences of &quot;A&quot; with &quot;Orange&quot;?

Replace string within file contents

I am trying to find a simple way of getting a count of the number of elements in a list:

    MyList = [&quot;a&quot;, &quot;b&quot;, &quot;c&quot;]

I want to know there are 3 elements in this list.


Python - Count elements in list

A coworker just told me that the C# Dictionary collection resizes by prime numbers for arcane reasons relating to hashing. And my immediate question was, &quot;how does it know what the next prime is? do they story a giant table or compute on the fly? that&#39;s a scary non-deterministic runtime on an insert causing a resize&quot;

So my question is, given N, which is a prime number, what is the most efficient way to compute the next prime number?

Given Prime Number N, Compute the Next Prime?

To test whether a number is prime or not, why do we have to test whether it is divisible only up to the square root of that number?

Why do we check up to the square root of a number to determine if the number is prime?

Supposing simple uniform hashing, that being, any given value is equally like to hash into any of the slots of the hash. Why is it better to use a table of size 127 and not 128? I really don&#39;t understand what&#39;s the problem with the power of 2 numbers. Or how it actually makes any difference at all.

&gt; When  using  the  division  method, 
&gt; we  usually  avoid  certain  values 
&gt; of  m (table size). For example, m
&gt; should not be a power of 2, since if m
&gt; = 2^p  , then h(k) is just the p lowest-order bits of k.

Let&#39;s suppose the possible elements are only between 1 and 10000 and I picked the table size as 128. How can 127 be better?
So 128 is 2^6 (1000000) and 127 is 0111111. What difference does this make? All numbers (when hashed) are still going to be the p lowest-order bits of k for 127 too. Did I get something wrong?

I&#39;m looking for some examples as I really can&#39;t understand why is this bad. Thanks a lot in advance!

PS: I am aware of:
https://stackoverflow.com/questions/3980117/hash-table-why-size-should-be-prime

Why is the size 127 (prime) better than 128 for a hash-table?

Can anyone tell me why the number 5381 is used in the DJB hash function?

The DJB hash function is defined as:

- h&lt;sub&gt; 0&lt;/sub&gt; = 5381

- h&lt;sub&gt; i&lt;/sub&gt; = 33h&lt;sub&gt; i - 1&lt;/sub&gt; + s&lt;sub&gt; i&lt;/sub&gt;

Here&#39;s a C implementation:

```c
unsigned int DJBHash(char* str, unsigned int len)
{
   unsigned int hash = 5381;
   unsigned int i    = 0;

   for(i = 0; i &lt; len; str++, i++)
   {   
      hash = ((hash &lt;&lt; 5) + hash) + (*str);
   }   

   return hash;
}
```

Reason for the number 5381 in the DJB hash function?

In Javascript how would i find prime numbers between 0 - 100? i have thought about it, and i am not sure how to find them. i thought about doing x % x but i found the obvious problem with that.
this is what i have so far:
but unfortunately it is the worst code ever.

    var prime = function (){
	var num;
	for (num = 0; num &lt; 101; num++){
		if (num % 2 === 0){
			break;
		}
		else if (num % 3 === 0){
			break;
		}
		else if (num % 4=== 0){
			break;
		}
		else if (num % 5 === 0){
			break;
		}
		else if (num % 6 === 0){
			break;
		}
		else if (num % 7 === 0){
			break;
		}
		else if (num % 8 === 0){
			break;
		}
		else if (num % 9 === 0){
			break;
		}
		else if (num % 10 === 0){
			break;
		}
		else if (num % 11 === 0){
			break;
		}
		else if (num % 12 === 0){
			break;
		}
		else {
			return num;
		}
	}
    };
    console.log(prime());

Checking if a number is prime in Python

Python Problem Overview

Python Solutions

How to use dependency injection with an attribute?

Does .NET have icon collections?

Attributions