You should add reference to PresentationCore.dll.

The `System.Windows.Media.Imaging` namespace is part of PresentationCore.dll (if you are using Visual Studio 2008 then the WPF application template will automatically add this reference). Note that this namespace is not a direct wrapping of the WIC library, although a large proportion of the more common uses are still available and it is relatively obvious how these map to the WIC versions. For more information on the classes in this namespace check out

 http://msdn2.microsoft.com/en-us/library/system.windows.media.imaging.aspx

Add `PresentationCore.dll` to your references. This dll url in my pc -  `C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\PresentationCore.dll`

For **Visual Studio 2017**

&gt; Find &quot;References&quot; in Solution explorer
&gt; 
&gt; Right click &quot;References&quot; 
&gt; 
&gt; Choose &quot;Add Reference...&quot;
&gt; 
&gt; Find &quot;Presentation.Core&quot; list and check checkbox
&gt; 
&gt; Click OK



You can add PresentationCore.dll more conveniently by editing the project file. Add the following code into your csproj file:

    &lt;ItemGroup&gt;
       &lt;FrameworkReference Include=&quot;Microsoft.WindowsDesktop.App&quot; /&gt;
    &lt;/ItemGroup&gt;

In your solution explorer, you now should see this framework listed, now. With that, you then can also refer to the classes provided by PresentationCore.dll.

I my case I needed to specify `Platforms` tag - for some reason it did not work otherwise.

```
  &lt;PropertyGroup&gt;
    &lt;!-- Must be here for this example, otherwise &#39;using System.Windows.Media.Media3D&#39; does not work for intellisense --&gt;
    &lt;Platforms&gt;x64&lt;/Platforms&gt;
  &lt;/PropertyGroup&gt;
```

Visual studio 2019 v16.9.1.



I&#39;m using `CGEventCreateKeyboardEvent` and need to know what `CGKeyCode` values to use.

Specifically, I am after the key code for the &lt;kbd&gt;Command&lt;/kbd&gt; key. The docs give examples for other keys: &lt;kbd&gt;z&lt;/kbd&gt; is `6`, &lt;kbd&gt;shift&lt;/kbd&gt; is `56`.

There must be a list of Mac virtual keycodes somewhere? 

Where can I find a list of Mac virtual key codes?

    &lt;html&gt;
        &lt;head&gt;
        &lt;/head&gt;
        &lt;body&gt;
            &lt;div&gt;
                &lt;a href=&quot;http://www.google.com&quot;&gt;
                    &lt;span&gt;title&lt;br&gt;&lt;/span&gt;
                    &lt;span&gt;description&lt;br&gt;&lt;/span&gt;
                    &lt;span&gt;some url&lt;/span&gt;
                &lt;/a&gt;
            &lt;/div&gt;
        &lt;/body&gt;
    &lt;/html&gt;

I am pretty new to CSS, I have a simple case like the above. I would like to make the &quot;title&quot; and &quot;some url&quot; clickable but want to make description as non-clickable. Is there any way to do that by applying some CSS on the span so that whatever inside that span, it is not clickable.
My constraint is that, I do not want to change the structure of the div, instead just applying css can we make a span which is inside an anchor tag, not clickable ? 


Use CSS to make a span not clickable

I&#39;m using an object from a 3rd party API that has a property of type `System.Windows.Media.ImageSource`, yet I can&#39;t seem to find the System.Windows.Media namespace anywhere. If I try to add a reference to my project I don&#39;t see `System.Windows.Media` in the list of options. My project is also targeting .Net 3.5.


Is there something else I need to do to be able to access this namespace?

Can&#39;t find System.Windows.Media namespace?

<p>I'm using an object from a 3rd party API that has a property of type <code>System.Windows.Media.ImageSource</code>, yet I can't seem to find the System.Windows.Media namespace anywhere. If I try to add a reference to my project I don't see <code>System.Windows.Media</code> in the list of options. My project is also targeting .Net 3.5.</p>
<p>Is there something else I need to do to be able to access this namespace?</p>


I am writing a Mesh Rendering manager and thought it would be a good idea to group all of the meshes which use the same shader and then render these while I&#39;m in that shader pass.  

I am currently using a `foreach` loop, but wondered if utilising LINQ might give me a performance increase?



Is a LINQ statement faster than a &#39;foreach&#39; loop?

From the docs: 

&gt;The as operator is like a cast except that it yields null on conversion failure instead of raising an exception. More formally, an expression of the form:
&gt;
       expression as type
&gt;
is equivalent to:
&gt;    
      expression is type ? (type)expression : (type) null
&gt;
except that expression is evaluated only once.



So why wouldn&#39;t you choose to either do it one way or the other.  Why have two systems of casting?

What&#39;s the point of &quot;As&quot; keyword in C#

I would like to sort my list with the `date` property.

This is my custom class:

```c#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Test.Web
{
    public class cTag
    {
        public int id { get; set; }
        public int regnumber { get; set; }
        public string date { get; set; }
    }
}
```

An this is the `List` that I want to sort:

```c#
List&lt;cTag&gt; Week = new List&lt;cTag&gt;();
```

I want to sort the `List` by the `date` property of the `cTag` class.
The date is in the format `dd.MM.yyyy`.

I read something about the `IComparable` interface, but I don&#39;t know how to use it.

Sort a Custom Class List&lt;T&gt;

In SQL, you can use the following syntax:

    SELECT *
    FROM MY_TABLE
    WHERE VALUE_1 IN (1, 2, 3)

Is there an equivalent in C#?  The IDE seems to recognise &quot;in&quot; as a keyword, but I don&#39;t seem to be able to find any information on it.

So, is it possible to do something like the following:

    int myValue = 1;
    if (myValue in (1, 2, 3))
        // Do something
    
Instead of


    int myValue = 1;
    if (myValue == 1 || myValue == 2 || myValue == 3)
        // Do something


Is there a C# IN operator?

Eric Lippert&#39;s comments in [this question](https://stackoverflow.com/questions/3166349/what-is-the-type-in-typeobjectname-var) have left me thoroughly confused. What is the difference between casting and conversion in C#?

What is the difference between casting and conversion?

I&#39;m using NHibernate 2.1.2.400 that is referencing log4net 1.2.10.0.
In the same project, I also use the simply accounting SDK, sadly it is still using log4net 1.2.9.0.

So I can get NHibernate to work if I reference log4net 1.2.10.0 but the simplySDK don&#39;t work.  And vice versa...

I&#39;m guessing most of the problems come from the fact that log4net has changed its assembly key. I tried using a binding redirection without success: the 2 DLLs do not have the same key.

I&#39;m considering recompiling NHibernate to use log4net 1.2.9.0 but it seems like the wrong thing to do and my feeling is that Simply Accounting won&#39;t be updating their SDK to use log4net 1.2.10.0 anytime soon.

What is the best way to handle this? Is it possible to resolve at all?

Referencing 2 different versions of log4net in the same solution

We all know [mutable structs are evil][1] in general. I&#39;m also pretty sure that because `IEnumerable&lt;T&gt;.GetEnumerator()` returns type `IEnumerator&lt;T&gt;`, the structs are immediately boxed into a reference type, costing more than if they were simply reference types to begin with.

So why, in the BCL generic collections, are all the enumerators mutable structs? Surely there had to have been a good reason. The only thing that occurs to me is that structs can be copied easily, thus preserving the enumerator state at an arbitrary point. But adding a `Copy()` method to the `IEnumerator` interface would have been less troublesome, so I don&#39;t see this as being a logical justification on its own.

Even if I don&#39;t agree with a design decision, I would like to be able to understand the reasoning behind it.

  [1]: https://ericlippert.com/2008/05/14/mutating-readonly-structs/

Why do BCL Collections use struct enumerators, not classes?

I&#39;ve been working for a while on my Windows Forms project, and I decided to experiment with keyboard shortcuts. After a bit of reading, I figured I had to just write an event handler and bind it to the form&#39;s KeyDown event:

    private void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Control &amp;&amp; e.Alt &amp;&amp; e.KeyCode == Keys.O)
        {
            MessageBox.Show(&quot;Ctrl+Alt+O: magic!&quot;);
        }
    }

I did that the good ol&#39; way of opening the Properties panel of the Visual Studio designer, then double-clicking on the KeyDown event of my form to generate the `Form1_KeyDown` event handler. But on testing my application, the form doesn&#39;t respond at all to the &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;Alt&lt;/kbd&gt;+&lt;kbd&gt;O&lt;/kbd&gt; keyboard shortcut. The Visual Studio designer did generate the code to bind the event handler to the form though:

    private void InitializeComponent()
    {
        // ...

        this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);

        // ...
    }

So I tried adding a `Console.WriteLine()` call to the handler to check that it was being called at all, but no luck on that either.

Also, I tried to set a breakpoint on the event binding call (shown just above) and found that the program reaches that breakpoint just fine. But any breakpoints I set within the method definition itself are never reached.

To make sure I was doing the first few steps correctly, I tried repeating them with:

 - **A new form in the same solution.**  
&lt;del&gt;Same issue: the form doesn&#39;t respond when I press my &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;Alt&lt;/kbd&gt;+&lt;kbd&gt;O&lt;/kbd&gt; keyboard shortcut and the debugger isn&#39;t even stepping into the event handler.&lt;/del&gt; Tried this again and it works.

 - **A brand new WinForms solution.**  
It works perfectly: the message dialog appears (the `Console.WriteLine()` call also works).

So I&#39;m quite lost here. What&#39;s preventing all the forms in this one project from receiving KeyDown events?

Forms not responding to KeyDown events

&gt; **Possible Duplicate:**  
&gt; [How to get the MonthName in c#?](https://stackoverflow.com/questions/975531/how-to-get-the-monthname-in-c)  

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

I used the following c# syntax to get month name from month no but i get `August` i want only `Aug`..


    System.Globalization.DateTimeFormatInfo mfi = new 
    System.Globalization.DateTimeFormatInfo();
    string strMonthName = mfi.GetMonthName(8).ToString();

Any suggestion...

Get Month name from month number

Will ConfigurationManager.AppSettings[&quot;blah&quot;] throw an exception if &quot;blah&quot; doesn&#39;t exist in the web/app.config?

Will ConfigurationManager.AppSettings[&quot;blah&quot;] throw an exception if &quot;blah&quot; doesn&#39;t exist?

I&#39;m getting a:

&gt;type or namespace name could not be found

error for a C# WPF app in VS2010. This area of code was compiling fine, but suddenly I&#39;m getting this error. I&#39;ve tried removing the Project Reference and the `using` statement, shutting VS2010 and restarting, but still I have this issue.

Any ideas why this might be occurring, where it seems like I&#39;m doing the right thing re Reference &amp; `using` statement?

I also noted in VS2010 that intellisense for that namespace is working ok, so it seems like VS2010 has the project reference and is seeing the namespace on one hand, but during compile doesn&#39;t see it?


Getting &quot;type or namespace name could not be found&quot; but everything seems ok?

We currently have quite a few classes in a project, and each of those classes implement an interface, mostly for DI reasons. 

Now, my personal feeling is that these interfaces should be put into a separate namespace within the same assembly (so we have a `MyCompany.CoolApp.DataAccess` assembly, and within that there&#39;s an `Interfaces` namespace giving  `MyCompany.CoolApp.DataAccess.Interfaces`).

However, somebody has suggested that these interfaces should actually be in their own assembly.  And my question is - are they right? I can see that there are some benefits (eg. other projects will only need to consume the interface assembly), but at the end of they day all of these assemblies are going to need to be loaded. It also seems to me that there could be a slightly more complex deployment issue, as Visual Studio will not automatically pull the implementing assembly into the target&#39;s bin folder.

Are there best practice guidelines for this?

EDIT:

To make my point a little clearer: We already separate UI, DataAccess, DataModel and other things into different assemblies. We can also currently swap out our implementation with a different implementation without any pain, as we map the implementing class to the interface using Unity (IOC framework). I should point out that we never write two implementations of the same interface, except for reasons of polymorphism and creating mocks for unit testing. So we don&#39;t currently &quot;swap out&quot; an implementation except in unit tests.  

The only downside I see of having the interface in the same assembly as the implementation is that the whole assembly (including the unused implementation) will have been loaded. 

I can, however, see the point that having them in a different assembly means that developers won&#39;t accidentally &quot;new&quot; the implementing class rather than have it created using the IOC wrapper.

One point I haven&#39;t understood from the answers is the deployment issue.  If I am just depending on the interface assemblies, I&#39;ll have a something  like the following structure:

    MyCompany.MyApplication.WebUI
        References:
            MyCompany.MyApplication.Controllers.Interfaces
            MyCompany.MyApplication.Bindings.Interfaces
            etc...

When I build this, the assemblies that are automatically put into the bin folder are just those interface assemblies.  However, my type mappings in unity map different interfaces to their actual implementations. How do the assemblies that contain my implementations end up in the bin folder?  

Should I have a separate assembly for interfaces?

What are PHP Namespaces? 

What are Namespaces in general? 

A Layman answer with an example would be great. 



What are namespaces?

I have the following code:

   

    return &quot;[Inserted new &quot; + typeof(T).ToString() + &quot;]&quot;;

But

     typeof(T).ToString()

  returns the full name including namespace

Is there anyway to just get the class name (without any namespace qualifiers?)

Get type name without full namespace

I would like to understand why you might want to use the `global::` prefix. In the following code, ReSharper is identifying it as redundant, and able to be removed:

![alt text][1]


  [1]: https://farm5.static.flickr.com/4141/4922038418_f6906070c3_o.png

Content Type	Original Author	Original Content on Stackoverflow
Question	Eric Anastas	View Question on Stackoverflow
Solution 1 - C#	MegaMilivoje	View Answer on Stackoverflow
Solution 2 - C#	VOX	View Answer on Stackoverflow
Solution 3 - C#	Mehmedov	View Answer on Stackoverflow
Solution 4 - C#	Mike from PSG	View Answer on Stackoverflow
Solution 5 - C#	Owlbuster	View Answer on Stackoverflow
Solution 6 - C#	TarmoPikaro	View Answer on Stackoverflow

Can't find System.Windows.Media namespace?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Solution 5 - C#

Solution 6 - C#

Use CSS to make a span not clickable

Where can I find a list of Mac virtual key codes?

Attributions