No.  There is no option for default types on generic types in C#.

Your second example is often the &quot;best&quot; option available, if you need this behavior.

I know this has been answered before, but it seems that executing the script directly &quot;python filename.py&quot; does not work. I have Python 2.6.2 on SuSE Linux.

Code:

    #!/usr/bin/python
    # -*- coding: utf-8 -*-
    from multiprocessing import Pool
    p = Pool(1)
    def f(x):
        return x*x
    p.map(f, [1, 2, 3])

Command line:


    &gt; python example.py
    Process PoolWorker-1:
    Traceback (most recent call last):
    File &quot;/usr/lib/python2.6/multiprocessing/process.py&quot;, line 231, in _bootstrap
        self.run()
    File &quot;/usr/lib/python2.6/multiprocessing/process.py&quot;, line 88, in run
        self._target(*self._args, **self._kwargs)
    File &quot;/usr/lib/python2.6/multiprocessing/pool.py&quot;, line 57, in worker
        task = get()
    File &quot;/usr/lib/python2.6/multiprocessing/queues.py&quot;, line 339, in get
        return recv()
    AttributeError: &#39;module&#39; object has no attribute &#39;f&#39;


yet another confusion with multiprocessing error, &#39;module&#39; object has no attribute &#39;f&#39;

I came across a scenario where giving a `script` element an `id` attribute would solve a problem easily. However, after reading about the `script` element at [w3schools][1] and [quirksmode][2], it seems doing so could have some unforeseen consequences.

Has anyone come across any of these issues with browsers such as Chrome, Safari, FF3 up and IE 7 up?




  [1]: http://www.w3schools.com/TAGS/tag_script.asp &quot;w3schools&quot;
  [2]: http://www.quirksmode.org/js/placejs.html &quot;quirksmode&quot;

Giving the script tag an ID

Is it possible to do something like

    public class PriorityQueue&lt;TValue, TPriority=int&gt; where TPriority : IComparable

(note the `=int`) ?

Before you suggest it, yes, I know I can just add another line:

    public class PriorityQueue&lt;TValue&gt; : PriorityQueue&lt;TValue, int&gt; { }

But I&#39;m wondering if it&#39;s possible to do it as a param.

Default for generic type?

Is it possible to do something like
<pre><code class="hljs language-csharp">public class PriorityQueue&#x3C;TValue, TPriority=int> where TPriority : IComparable
</code></pre>
(note the <code>=int</code>) ?
Before you suggest it, yes, I know I can just add another line:
<pre><code class="hljs language-csharp">public class PriorityQueue&#x3C;TValue> : PriorityQueue&#x3C;TValue, int> { }
</code></pre>
But I'm wondering if it's possible to do it as a param.

I am getting this error on code that used to work.  I have not changed the code.

Here is the full error:
&gt; The CLR has been unable to transition from COM context 0x3322d98 to COM context 0x3322f08 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.

And here is the code that caused it:

    var openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
    openFileDialog1.DefaultExt = &quot;mdb&quot;;
    openFileDialog1.Filter = &quot;Management Database (manage.mdb)|manage.mdb&quot;;

    //Stalls indefinitely on the following line, then gives the CLR error
    //one minute later.  The dialog never opens.
    if(openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        ....
    }

Yes, I am sure the dialog is not open in the background, and no, I don&#39;t have any explicit COM code or unmanaged marshalling or multithreading.

I have no idea why the OpenFileDialog won&#39;t open - any ideas?

The CLR has been unable to transition from COM context [...] for 60 seconds

Which would be better code:

    int index = fileName.LastIndexOf(&quot;.&quot;, StringComparison.InvariantCultureIgnoreCase);

or

    int index = fileName.LastIndexOf(&quot;.&quot;, StringComparison.OrdinalIgnoreCase);





String comparison: InvariantCultureIgnoreCase vs OrdinalIgnoreCase?

&gt; **Possible Duplicate:**  
&gt; [C#: Difference between ‘ += anEvent’ and ‘ += new EventHandler(anEvent)’](https://stackoverflow.com/questions/550703/c-difference-between-anevent-and-new-eventhandleranevent)  

&lt;!-- End of automatically inserted text --&gt;

There are two basic ways to subscribe to an event:

    SomeEvent += new EventHandler&lt;ArgType&gt; (MyHandlerMethod);
    SomeEvent += MyHandlerMethod;

What is the difference, and when should I chose one over the other?

Edit: If it is the same, then why does VS default to the long version, cluttering the code? That makes no sense at all to me.

+= new EventHandler(Method) vs += Method

How do I tell if a decimal or double value is an integer?

For example:

    decimal d = 5.0; // Would be true
    decimal f = 5.5; // Would be false

or 

    double d = 5.0; // Would be true
    double f = 5.5; // Would be false


The reason I would like to know this is so that I can determine programmatically if I want to output the value using `.ToString(&quot;N0&quot;)` or `.ToString(&quot;N2&quot;)`.  If there is no decimal point value, then I don&#39;t want to show that.

How to determine if a decimal/double is an integer?

I want to learn if there is another (*faster*) way to output text to the console application window using C# .net than with the simple **Write**, **BackgroundColor** and **ForegroundColor** methods and properties? I learned that each cell has a background color and a foreground color, and I would like to cache/buffer/write faster than using the mentioned methods.

Maybe there is some help using the Out buffer, but I don&#39;t know how to encode the colors into the stream, if that is where the color data resides. 

This is for a retrostyle textbased game I am wanting to implement where I make use of the standard colors and ascii characters for laying out the game. 

Please help :)

**Update:**

The Out and buffer is probably not what I need to mess around with. There seems to be a screen buffer that is owned by the console. I don&#39;t know how to access it, maybe I am just out of luck unless I import some dlls.

How can I write fast colored output to Console?

### Questions:

* What are raw types in Java, and why do I often hear that they shouldn&#39;t be used in new code?
* What is the alternative if we can&#39;t use raw types, and how is it better?

What is a raw type and why shouldn&#39;t we use it?

I have a List which is declared like this :

     List&lt;? extends Number&gt; foo3 = new ArrayList&lt;Integer&gt;();

I tried to add 3 to foo3. However I get an  error message like this:

    The method add(capture#1-of ? extends Number) in the type List&lt;capture#1-of ?
    extends Number&gt; is not applicable for the arguments (ExtendsNumber)

How can I add to List&lt;? extends Number&gt; data structures?

Why can I use `super` only with wildcards and not with type parameters?

For example, in the `Collection` interface, why is the `toArray` method not written like this

    interface Collection&lt;T&gt;{
        &lt;S super T&gt; S[] toArray(S[] a);
    }


Bounding generics with &#39;super&#39; keyword

Yesterday I&#39;ve implemented the code:

    CustomerProductManager productsManager = container.Resolve&lt;CustomerProductManager&gt;();

It was compilable and working.

Today (probably I&#39;ve modified something) I am constantly getting the error:

&gt; The non-generic method
&gt; &#39;Microsoft.Practices.Unity.IUnityContainer.Resolve(System.Type,
&gt; string, params
&gt; Microsoft.Practices.Unity.ResolverOverride[])&#39;
&gt; cannot be used with type arguments

My collegue has the same source code and doesn&#39;t have same error. Why? How to resolve the problem?

P.S. 

line &quot;using Microsoft.Practices.Unity;&quot; is present in usings section.

I&#39;ve tried to replace generic version with non-generic one:

    CustomerProductManager productsManager = (CustomerProductManager)container.Resolve(typeof(CustomerProductManager));

And got another error:

&gt; No overload for method &#39;Resolve&#39; takes
&gt; &#39;1&#39; arguments

It seems like one of the assemblies is not referenced.. but which one? I have 2 of them referenced:
1. Microsoft.Practices.Unity.dll
2. Microsoft.Practices.ServiceLocation.dll

P.P.S. I&#39;ve saw similar problem http://unity.codeplex.com/WorkItem/View.aspx?WorkItemId=8205 but it is resolved as &quot;not a bug&quot;

Any thought will be helpful

IUnityContainer.Resolve&lt;T&gt; throws error claiming it cannot be used with type parameters

In some interfaces I wrote I&#39;d like to name generic type parameters with more than one character to make the code more readable.

Something like....

    Map&lt;Key,Value&gt;

Instead of this...

    Map&lt;K,V&gt;

But when it comes to methods, the type-parameters look like java-classes which is also confusing.

    public void put(Key key, Value value)

This seems like Key and Value are classes. I found or thought of some notations, but nothing like a convention from Sun or a general best-practice.

Alternatives I guessed or found...

    Map&lt;KEY,VALUE&gt;
    Map&lt;TKey,TValue&gt;
    



Generic type parameter naming convention for Java (with multiple chars)?

The Microsoft .NET Framework 4.0 full installer (32- and 64-bit) is 48.1&amp;nbsp;MB and the Client Profile installer is 41.0&amp;nbsp;MB. The extracted installation files are 237&amp;nbsp;MB and 194&amp;nbsp;MB respectively, and once installed, they are 537&amp;nbsp;MB and 427&amp;nbsp;MB.

This is a difference of 110&amp;nbsp;MB. What difference is there between the two packages?

When is it preferable to install the Client Profile instead of the full .NET Framework? 


Differences between Microsoft .NET 4.0 full Framework and Client Profile

I have the following line of code:

    var connectionString = configItems.
                    Find(item =&gt; item.Name.ToLowerInvariant() == &quot;connectionstring&quot;);

VS 2010 code analysis is telling me the following:

&gt;Warning	7	CA1308 : Microsoft.Globalization : In method ... replace the call to &#39;string.ToLowerInvariant()&#39; with String.ToUpperInvariant().	

Does this mean `ToUpperInvariant()` is more reliable?


What is wrong with ToLowerInvariant()?

Since I upgraded my project to visual studio 2010 project format, my C++/CLI project is targeted to .net framework 4.0. 

It is easy to switch the framework version to another version from a C# project, but I have no clue how to do this in a C++/CLI project, I see no setting for this in the project property pages.


Change C++/CLI project to another framework than 4.0 with vs2010

There are a few minor places where code for my project may be able to be drastically improved if the target framework were a newer version. I&#39;d like to be able to better leverage conditional compilation in C# to switch these as needed.

Something like:

    #if NET40
    using FooXX = Foo40;
    #elif NET35
    using FooXX = Foo35;
    #else NET20
    using FooXX = Foo20;
    #endif

Do any of these symbols come for free? Do I need to inject these symbols as part of the project configuration? It seems easy enough to do since I&#39;ll know which framework is being targeted from MSBuild.

    /p:DefineConstants=&quot;NET40&quot;

How are people handling this situation? Are you creating different configurations? Are you passing in the constants via the command line?



Conditional compilation and framework targets

C#, .NET 4.0, VS2010.

New to WPF.  I have a ComboBox on my MainWindow.  I hooked the SelectionChanged event of said combo box.  However, if I examine the value of the combo box in the event handler, it has the old value.  This sounds more like a &quot;SelectionChanging&quot; event, than a SelectionChanged event.  

How do I get the new value of the ComboBox after the selection has actually happend?

Currently:

    this.MyComboBox.SelectionChanged += new SelectionChangedEventHandler(OnMyComboBoxChanged);

    ...
    private void OnMyComboBoxChanged(object sender, SelectionChangedEventArgs e)
    {
        string text = this.MyComboBox.Text;
    }
    

Note, I get the same behaviour if I use the object being passed in the event args, e.g. e.OriginalSource.

Content Type	Original Author	Original Content on Stackoverflow
Question	mpen	View Question on Stackoverflow
Solution 1 - C#	Reed Copsey	View Answer on Stackoverflow

Default for generic type?

C# Problem Overview

C# Solutions

Solution 1 - C#

Giving the script tag an ID

yet another confusion with multiprocessing error, 'module' object has no attribute 'f'

Attributions