Are you running .NET 2.0 ? Its first supported in 3.5 and 4.0 check [**here**][1].


  [1]: http://msdn.microsoft.com/en-us/library/system.runtime.serialization.json.datacontractjsonserializer.aspx

I think this library is now deprecated in favour of Json.NET. JsonObject is a JObject and uses Json.NET library.

[Documentation][1]


  [1]: http://www.newtonsoft.com/json/help/html/LINQtoJSON.htm

You might just need to update it in your VS, it can be added in the project but not updated


I need to modify a column in a SQLite database but I have to do it programatically due to the database already being in production.  From my research I have found that in order to do this I must do the following.

 - Create a new table with new schema
 - Copy data from old table to new table
 - Drop old table
 - Rename new table to old tables name

That seems like a ridiculous amount of work for something that should be relatively easy.  Is there not an easier way? All I need to do is change a constraint on a existing column and give it a default value.



SQLite Modify Column

What special characters are allowed for file names on Android?

    ~!@#$%^&amp;*()_+/\.,

Also, can I save file with Unicode name?

What characters allowed in file names on Android?

I&#39;ve added the reference to **System.Runtime.Serialization** dll to my project but still can&#39;t find the **System.Runtime.Serialization.Json** namespace and hence can&#39;t find the **DataContractJsonSerializer** class. What am I missing here?

Where is the System.Runtime.Serialization.Json namespace?

I've added the reference to System.Runtime.Serialization dll to my project but still can't find the System.Runtime.Serialization.Json namespace and hence can't find the DataContractJsonSerializer class. What am I missing here?

I would like to clamp a value `x` to a range `[a, b]`:

    x = (x &lt; a) ? a : ((x &gt; b) ? b : x);

This is quite basic. But I do not see a function &quot;clamp&quot; in the class library - at least not in `System.Math`.

(For the unaware to &quot;clamp&quot; a value is to make sure that it lies between some maximum and minimum values. If it’s greater than the max value, then it’s replaced by the max, etc.)

Where can I find the &quot;clamp&quot; function in .NET?

I would like to compute both the sine and co-sine of a value together (for example to create a rotation matrix). Of course I could compute them separately one after another like `a = cos(x); b = sin(x);`, but I wonder if there is a faster way when needing both values.

**Edit:**
To summarize the answers so far:

 - [*Vlad*][1] said, that there is the asm command `FSINCOS` computing both of them (in almost the same time as a call to `FSIN` alone)

 - Like [*Chi*][2] noticed, this optimization is sometimes already done by the compiler (when using optimization flags).

 - [*caf*][3] pointed out, that functions `sincos` and `sincosf` are probably available and can be called directly by just including `math.h`

 - [*tanascius*][4] approach of using a look-up table is discussed controversial. (However on my computer and in a benchmark scenario it runs 3x faster than `sincos` with almost the same accuracy for 32-bit floating points.)

 - [*Joel Goodwin*][5] linked to an interesting approach of an extremly fast approximation technique with quite good accuray (for me, this is even faster then the table look-up)

[1]: https://stackoverflow.com/a/2683691
[2]: https://stackoverflow.com/a/2683963
[3]: https://stackoverflow.com/a/2687338
[4]: https://stackoverflow.com/a/2683613
[5]: https://stackoverflow.com/a/2683853

What is the fastest way to compute sin and cos together?

In MSDN I found `CloseReason.UserClosing` to know that the user had decided to close the form
but I guess it is the same for both clicking the X button or clicking the close button.
So how can I differentiate between these two in my code?

Thanks all.

How to know user has clicked &quot;X&quot; or the &quot;Close&quot; button?

Does C# have an equivalent to VB.NET&#39;s DirectCast?

I am aware that it has () casts and the &#39;as&#39; keyword, but those line up to CType and TryCast.

To be clear, these keywords do the following;

**CType/() casts**:  If it is already the correct type, cast it, otherwise look for a type converter and invoke it. If no type converter is found, throw an InvalidCastException.

**TryCast/&quot;as&quot; keyword**: If it is the correct type, cast it, otherwise return null.

**DirectCast**: If it is the correct type, cast it, otherwise throw an InvalidCastException.

After I have spelled out the above, some people have still responded that () is equivalent, so I will expand further upon why this is not true.

DirectCast only allows for either narrowing or widening conversions on the inheritance tree. It does not support conversions across different branches like () does, i.e.:

C# - this compiles and runs:

&lt;!-- language: cs --&gt;

    //This code uses a type converter to go across an inheritance tree
    double d = 10;
    int i = (int)d;

VB.NET - this does NOT COMPILE

&lt;!-- language: vb.net --&gt;

    &#39;Direct cast can only go up or down a branch, never across to a different one.
    Dim d As Double = 10
    Dim i As Integer = DirectCast(d, Integer)

The equivalent in VB.NET to my C# code is CType:

&lt;!-- language: vb.net --&gt;

    &#39;This compiles and runs
    Dim d As Double = 10
    Dim i As Integer = CType(d, Integer)





C#&#39;s equivalent to VB.NET&#39;s DirectCast

I am running a month-end process and want to have it automatically create some of the reports that need to be created at that time. I am using rdlc reports. Is there a way to automatically create a PDF from a RDLC report in the background?

Creating a PDF from a RDLC Report in the Background

How can I perform a redirect with `Server.Transfer()` to the same page that is currently shown? 

I want to have A cleared form after submit.

What other/better methods can I use to achieve the same?


redirect to current page in ASP.Net

I have some stored JSON strings stored in the DB which I want to return to the client as JsonResult . I know that Json(object) turns an object into JsonResult but what if I already have the result in a string ? can I cast it to JsonResult

Can I convert a JSON string into JsonResult?

Typically the main use of the question mark is for the conditional, `x ? &quot;yes&quot; : &quot;no&quot;`.

But I have seen another use for it but can&#39;t find an explanation of this use of the `?` operator, for example.

    public int? myProperty
    {
       get;
       set;
    }



What is the purpose of a question mark after a type (for example: int? myVariable)?

Other than the type it returns and the fact that you call it differently of course

    &lt;% Html.RenderPartial(...); %&gt;
    &lt;%= Html.Partial(...) %&gt;  

If they are different, why would you call one rather than the other one?  
The definitions:

    // Type: System.Web.Mvc.Html.RenderPartialExtensions
    // Assembly: System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
    // Assembly location: C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 2\Assemblies\System.Web.Mvc.dll

    using System.Web.Mvc;

    namespace System.Web.Mvc.Html
    {
        public static class RenderPartialExtensions
        {
            public static void RenderPartial(this HtmlHelper htmlHelper, string partialViewName);
            public static void RenderPartial(this HtmlHelper htmlHelper, string partialViewName, ViewDataDictionary viewData);
            public static void RenderPartial(this HtmlHelper htmlHelper, string partialViewName, object model);

            public static void RenderPartial(this HtmlHelper htmlHelper, string partialViewName, object model,
                                         ViewDataDictionary viewData);
        }
    }

    // Type: System.Web.Mvc.Html.PartialExtensions
    // Assembly: System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
    // Assembly location: C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 2\Assemblies\System.Web.Mvc.dll

    using System.Web.Mvc;

    namespace System.Web.Mvc.Html
    {
        public static class PartialExtensions
        {
            public static MvcHtmlString Partial(this HtmlHelper htmlHelper, string partialViewName);

            public static MvcHtmlString Partial(this HtmlHelper htmlHelper, string partialViewName,
                                            ViewDataDictionary viewData);

            public static MvcHtmlString Partial(this HtmlHelper htmlHelper, string partialViewName, object model);

            public static MvcHtmlString Partial(this HtmlHelper htmlHelper, string partialViewName, object model,
                                            ViewDataDictionary viewData);
        }
    }

What is the difference (if any) between Html.Partial(view, model) and Html.RenderPartial(view,model) in MVC2?

I am integrating SqlCacheDependency to use in my LinqToSQL datacontext.

I am using an extension class for Linq querys found here - http://code.msdn.microsoft.com/linqtosqlcache

I have wired up the code and when I open the page I get this exception - 

&quot;The SQL Server Service Broker for the current database is not enabled, and as a result query notifications are not supported.  Please enable the Service Broker for this database if you wish to use notifications.&quot;

its coming from this event in the global.asax

            protected void Application_Start()
        {
            RegisterRoutes(RouteTable.Routes);
            //In Application Start Event
            System.Data.SqlClient.SqlDependency.Start(new dataContextDataContext().Connection.ConnectionString);

        }

my question is...

1. how do i enable Service Broker in my SQL server 2008 database? I have tried to run this query.. ALTER DATABASE tablename SET ENABLE_BROKER but it never ends and runs for ever, I have to manually stop it.

2. once I have this set in SQL server 2008, will it filter down to my DataContext, or do I need to configure something there too ?

thanks for any help

Truegilly


Enabling Service Broker in SQL Server 2008

I just noticed that `Html.CheckBox(&quot;foo&quot;)` generates 2 inputs instead of one, anybody knows why is this so ?

    &lt;input id=&quot;foo&quot; name=&quot;foo&quot; type=&quot;checkbox&quot; value=&quot;true&quot; /&gt;
    &lt;input name=&quot;foo&quot; type=&quot;hidden&quot; value=&quot;false&quot; /&gt; 

asp.net mvc: why is Html.CheckBox generating an additional hidden input

How do I submit disabled input in ASP.NET MVC?




How do you get the current area name in the view or controller?

Is there anything like `ViewContext.RouteData.Values[&quot;controller&quot;]` for areas?

Get Current Area Name in View or Controller

How do I create a custom membership for ASP.NET MVC 2 based on the ASP.NET membership provider?



How do I create a custom membership provider for ASP.NET MVC 2?

Is it possible to post data to JsonP? Or does all data have to be passed in the querystring as a GET request?

I have alot of data that I need to send to the service, cross domain, and it is too large to send via the querystring

What are the options for getting around this?

Post data to JsonP

`file_get_contents(&quot;php://input&quot;)` or `$HTTP_RAW_POST_DATA` - which one is better to get the body of JSON request?

And which request type (`GET` or `POST`) should I use to send JSON data when using client side `XmlHTTPRequest`?

My question was inspired from this answer:
https://stackoverflow.com/questions/813487/how-to-post-json-to-php-with-curl/813512#813512

Quote from that answer:

&gt; From a protocol perspective `file_get_contents(&quot;php://input&quot;)` is actually more correct, since you&#39;re not really processing http multipart form data anyway.

file_get_contents(&quot;php://input&quot;) or $HTTP_RAW_POST_DATA, which one is better to get the body of JSON request?

I&#39;m trying my hands at a simple Chrome Extension, but am running into a problem with providing a value for the `matches` array in my `content_scripts`.

    {
      &quot;name&quot;: &quot;My Extension&quot;,
      &quot;version&quot;: &quot;1.0&quot;,
      &quot;description&quot;: &quot;My Extension Experiment&quot;,
      &quot;browser_action&quot;: {
        &quot;default_icon&quot;: &quot;icon.png&quot;,
        &quot;default_title&quot;: &quot;Ext&quot;,
        &quot;default_popup&quot;: &quot;popup.html&quot;
      },
      &quot;content_scripts&quot;: {
        &quot;matches&quot;: [&quot;http://*&quot;],
        &quot;js&quot;: [&quot;scripts.js&quot;]
      }
    }

When I try to load this extension into Chrome, I get the following message:

&gt; Could not load extension from &#39;C:\Users\foo\Desktop\Extensions\bar&#39;.&lt;br/&gt;Invalid value for &#39;content_scripts&#39;.

I cannot see what is &quot;invalid&quot; about my value though. What I&#39;m trying to do is match every URL, so my extension can manipulate the DOM (via javascript within `scripts.js`) of any page it is ran on. Am I missing something, going about this all wrong, or what?

**update**

After posting this question, I did notice that the Google example was slightly different than mine, so I modified my code a bit to reflect their syntax:

    &quot;content_scripts&quot;: [{
      &quot;matches&quot;: [&quot;http://*&quot;],
      &quot;js&quot;: [&quot;scripts.js&quot;]
    }]

That being said, I still get the following error when trying to load my extension:

&gt; Could not load extension from &#39;C:\Users\foo\Desktop\Extensions\bar&#39;.&lt;br/&gt;
Invalid value for &#39;content_scripts[0].matches[0]&#39;.

Chrome Extension Manifest &#39;Matches&#39;

I&#39;ve a problem with JSON in python.

In fact, if I try to execute this code, python gives me a sorted JSON string! 

For example:

```
values = {
  &#39;profile&#39;: &#39;testprofile&#39;,
  &#39;format&#39;: &#39;RSA_RC4_Sealed&#39;,
  &#39;enc_key&#39;: base64.b64encode(chiave_da_inviare),
  &#39;request&#39;: base64.b64encode(data)
}

values_json = json.dumps(values, sort_keys = False, separators = (&#39;,&#39;, &#39;:&#39;))
```

And this is the output:

```
{
  &quot;profile&quot;: &quot;testprofile&quot;,
  &quot;enc_key&quot;: &quot;GBWo[...]NV6w==&quot;,
  &quot;request&quot;: &quot;TFl[...]uYw==&quot;,
  &quot;format&quot;: &quot;RSA_RC4_Sealed&quot;
}
```

As you can see, I tried to use &quot;sort_keys=False&quot; but nothing changed.

How can I stop Python sorting my JSON strings?

JSON output sorting in Python

Let&#39;s say I have a serializable class `AppMessage`.

I would like to transmit it as `byte[]` over sockets to another machine where it is rebuilt from the bytes received.

How could I achieve this?

Java Serializable Object to Byte Array

I have an class defining an immutable value type that I now need to serialize. The immutability comes from the final fields which are set in the constructor. I&#39;ve tried serializing, and it works (surprisingly?) - but I&#39;ve no idea how.

Here&#39;s an example of the class

    public class MyValueType implements Serializable
    {
        private final int value;
    
        private transient int derivedValue;
    
        public MyValueType(int value)
        {
            this.value = value;
            this.derivedValue = derivedValue(value);
        }
    
        // getters etc...
    }

Given that the class doesn&#39;t have a no arg constructor, how can it be instantiated and the final field set? 

(An aside - I noticed this class particularly because IDEA wasn&#39;t generating a &quot;no serialVersionUID&quot; inspection warning for this class, yet successfully generated warnings for other classes that I&#39;ve just made serializable.)




How does java serialization deserialize final fields when no default constructor specified?

Is it possible to have `final transient` fields that are set to any non-default value after serialization in Java?  My usecase is a cache variable — that&#39;s why it is `transient`.  I also have a habit of making `Map` fields that won&#39;t be changed (i.e. contents of the map is changed, but object itself remains the same) `final`.  However, these attributes seem to be contradictory — while compiler allows such a combination, I cannot have the field set to anything but `null` after unserialization.

I tried the following, without success:

* simple field initialization (shown in the example): this is what I normally do, but the initialization doesn&#39;t seem to happen after unserialization;
* initialization in constructor (I believe this is semantically the same as above though);
* assigning the field in `readObject()` — cannot be done since the field is `final`.

In the example `cache` is `public` only for testing.

    import java.io.*;
    import java.util.*;

    public class test
    {
        public static void main (String[] args) throws Exception
        {
            X  x = new X ();
            System.out.println (x + &quot; &quot; + x.cache);

            ByteArrayOutputStream  buffer = new ByteArrayOutputStream ();
            new ObjectOutputStream (buffer).writeObject (x);
            x = (X) new ObjectInputStream (new ByteArrayInputStream (buffer.toByteArray ())).readObject ();
            System.out.println (x + &quot; &quot; + x.cache);
        }

        public static class X implements Serializable
        {
            public final transient Map &lt;Object, Object&gt;  cache = new HashMap &lt;Object, Object&gt; ();
        }
    }

Output:

    test$X@1a46e30 {}
    test$X@190d11 null



final transient fields and serialization

I&#39;m using jQuery.serialize to retrieve all data fields in a form.

My problem is that it does not retriev checkboxes that is not checked.

It includes this:
  
    &lt;input type=&quot;checkbox&quot; id=&quot;event_allDay&quot; name=&quot;event_allDay&quot; class=&quot;checkbox&quot; checked=&quot;checked&quot; /&gt;

but not this

    &lt;input type=&quot;checkbox&quot; id=&quot;event_allDay&quot; name=&quot;event_allDay&quot; class=&quot;checkbox&quot; /&gt;

  

How can I get &quot;values&quot; of checkboxes that is not checked?


jQuery serialize does not register checkboxes

What is the meaning of serialization concept in programming languages?

when we use `Serializable` attribute above a class, what is the meaning?

Content Type	Original Author	Original Content on Stackoverflow
Question	Kayes	View Question on Stackoverflow
Solution 1 - C#	Marc Gravell	View Answer on Stackoverflow
Solution 2 - C#	ntziolis	View Answer on Stackoverflow
Solution 3 - C#	nest	View Answer on Stackoverflow
Solution 4 - C#	Julian	View Answer on Stackoverflow

Where is the System.Runtime.Serialization.Json namespace?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

What characters allowed in file names on Android?

SQLite Modify Column

Attributions