In order to add an up-to-date answer: since dotnet core 2.1 `MediaTypeNames.Application.Json` has been defined. 

See https://github.com/dotnet/corefx/pull/26701 for the changeset.

See [Newer Answer][1].  This answer is now inaccurate.

While there are *some* MIME constants defined in MediaTypeNames (see [here][2]), there no constant for &quot;application/json&quot;.

Putting additional content types in a shared const is probably best practice, better than defining them in string literals a million times throughout your code at least.

Plus it gives you the flexibility of using new/custom MIME types, which a specific .NET version might not have.


  [1]: https://stackoverflow.com/a/54650792/270155
  [2]: https://stackoverflow.com/questions/10362140/asp-mvc-are-there-any-constants-for-the-default-content-types

There is now for Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6...

[System.Net.Mime.MediaTypeNames.Application.Json][1]


  [1]: https://docs.microsoft.com/en-us/dotnet/api/system.net.mime.mediatypenames.application.json?view=net-6.0

I have a vagrant box up and running (configured with a LAMP stack). I need to transfer it to another PC. How can I export it?
I guess that I can get a file (or files) that can be copied to another PC, so there I can run some command to import the vagrant box.

How to export a Vagrant virtual machine to transfer it

How could I refresh my context? I have entities based on views from my Database and when I made an update over one table Entity that has navigation properties to views, the entity is update but the view don&#39;t refresh accord the new updates...just want to get again from the Db the data.
Thanks!

Entity Framework Refresh context?

I&#39;ve just declared a constant for the &quot;application/json&quot; content type in one of my classes.

    public const string JsonContentType = &quot;application/json&quot;;

I&#39;m not sure it is a good practice.

Does .NET framework have a predefined const for &quot;application/json&quot;?

&quot;application/json&quot; constant in .NET framework

I've just declared a constant for the "application/json" content type in one of my classes.
<pre><code class="hljs language-csharp">public const string JsonContentType = "application/json";
</code></pre>
I'm not sure it is a good practice.
Does .NET framework have a predefined const for "application/json"?

I know the error message is common and there are plenty of questions on SO about this error, but no solutions have helped me so far, so I decided to ask the question. Difference to most of similar questions is me using App_Code directory.

Error message:

&lt;!-- language: lang-none --&gt;

    CS0012: The type &#39;Project.Rights.OperationsProvider&#39; is defined in an
    assembly that is not referenced. You must add a reference to assembly
    &#39;Project.Rights, version=1.0.0.0, Culture=neutral, PublicKeyToken=null&#39;.

Source File:

    c:\inetpub\wwwroot\Test\Website\App_Code\Company\Project\BusinessLogic\Manager.cs

Following suggestions [here][1] and [here][2], I have deleted all instances of Project.Rights.dll inside C:\Windows\Microsoft.NET/\*.*
According to [this][3], I checked if .cs files in question have build action set to &quot;Compile&quot;. They do.
I have also double checked that the .cs file containing the &quot;Project.Rights.OperationsProvider&quot; type is deployed to App_Code directory.

For some reason, application is not looking for the type in the App_Code directory. Since I&#39;ve deleted all instances of Project.Rights.dll (that I know of), I don&#39;t know which assembly the error message is mentioning.

  [1]: https://stackoverflow.com/questions/496269/asp-net-page-says-i-need-to-reference-an-assembly-that-does-not-exist
  [2]: https://stackoverflow.com/questions/284433/strange-error-cs0012-the-type-x-is-defined-in-an-assembly-that-is-not-referen
  [3]: https://stackoverflow.com/questions/1222281/app-code-classes-not-accessable-asp-net

The type is defined in an assembly that is not referenced, how to find the cause?

i have a file downloader function:

            HttpClientHandler aHandler = new HttpClientHandler();
            aHandler.ClientCertificateOptions = ClientCertificateOption.Automatic;
            HttpClient aClient = new HttpClient(aHandler);
            aClient.DefaultRequestHeaders.ExpectContinue = false;
            HttpResponseMessage response = await aClient.GetAsync(url);
            InMemoryRandomAccessStream randomAccessStream = new InMemoryRandomAccessStream();

            // To save downloaded image to local storage
            var imageFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(
            filename, CreationCollisionOption.ReplaceExisting);
            var fs = await imageFile.OpenAsync(FileAccessMode.ReadWrite);
            DataWriter writer = new DataWriter(fs.GetOutputStreamAt(0));

            writer.WriteBytes(await response.Content.ReadAsByteArrayAsync());

            await writer.StoreAsync();
            //current.image.SetSource(randomAccessStream);
            writer.DetachStream();
            await fs.FlushAsync();

How can i realize progress bar functionality?
Maybe i can get the writers bytes written so far? Or something?

**P.S. I cant use DownloadOperation(Background transferring) because data from server requests certificate - and this functionality doesn&#39;t exist in DownloadOperations.**

Progress bar with HttpClient

I need to integrate Asp.Net latest MVC version with an *existing* database which has an additional column `String Address` to table `dbo.AspNetUsers`


I need to create an instance `ApplicationUser` which has property Address.


Any idea how to do it?




Using Asp.Net Identity DataBase first approach

I fall into a surprising issue. 

I loaded a text file in my application and I have some logic which compares the value having &#181;.

And I realized that even if the texts are same the compare value is false.

     Console.WriteLine(&quot;μ&quot;.Equals(&quot;&#181;&quot;)); // returns false
     Console.WriteLine(&quot;&#181;&quot;.Equals(&quot;&#181;&quot;)); // return true

In later line the character  &#181; is copy pasted.

Any idea will be helpful.



How to compare &#39;μ&#39; and &#39;&#181;&#39; in C#

I fall into a surprising issue. 

I loaded a text file in my application and I have some logic which compares the value having &#181;.

And I realized that even if the texts are same the compare value is false.

     Console.WriteLine(&quot;μ&quot;.Equals(&quot;&#181;&quot;)); // returns false
     Console.WriteLine(&quot;&#181;&quot;.Equals(&quot;&#181;&quot;)); // return true

In later line the character  &#181; is copy pasted.

However, these might not be the only characters that are like this.

Is there any way in C# to compare the characters which look the same but are actually different?

How to compare Unicode characters that &quot;look alike&quot;?

I wrote such class:

    class Test
    {
        [Key]
        [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }
        [Required]
        public List&lt;String&gt; Strings { get; set; }

        public Test()
        {
            Strings = new List&lt;string&gt;
            {
                &quot;test&quot;,
                &quot;test2&quot;,
                &quot;test3&quot;,
                &quot;test4&quot;
            };
        }
    }

and

    internal class DataContext : DbContext
    {
        public DbSet&lt;Test&gt; Tests { get; set; }
    }

After run code:

    var db = new DataContext();
    db.Tests.Add(new Test());
    db.SaveChanges();

my data is getting saved but just the `Id`. I don&#39;t have any tables nor relationships applying to **Strings** list. 

What am I doing wrong? I tried also to make **Strings** `virtual` but it didn&#39;t change anything.

Thank you for your help.


Entity Framework - Code First - Can&#39;t Store List&lt;String&gt;

I&#39;m trying to implement request throttling via the following: 

https://stackoverflow.com/questions/33969/best-way-to-implement-request-throttling-in-asp-net-mvc

I&#39;ve pulled that code into my solution and decorated an API controller endpoint with the attribute: 

    [Route(&quot;api/dothis/{id}&quot;)]
    [AcceptVerbs(&quot;POST&quot;)]
    [Throttle(Name = &quot;TestThrottle&quot;, Message = &quot;You must wait {n} seconds before accessing this url again.&quot;, Seconds = 5)]
    [Authorize]
    public HttpResponseMessage DoThis(int id) {...}

This compiles but the attribute&#39;s code doesn&#39;t get hit, and the throttling doesn&#39;t work.  I don&#39;t get any errors though.  What am I missing?



How to throttle requests in a Web Api?

I have a link like this:

     &lt;a href=&#39;Member/MemberHome/Profile/Id&#39;&gt;&lt;span&gt;Profile&lt;/span&gt;&lt;/a&gt;

and when I click on this it will call this partial page:

     @{
        switch ((string)ViewBag.Details)
        {

            case &quot;Profile&quot;:
            {
               @Html.Partial(&quot;_Profile&quot;); break;
            }

		}
    }

Partial page _Profile contains:

    Html.Action(&quot;Action&quot;, &quot;Controller&quot;, model.Paramter) 

Example:
          
    @Html.Action(&quot;MemberProfile&quot;, &quot;Member&quot;, new { id=1 })   // id is always changing


My doubt is that how can I **pass this &quot;Id&quot; to model.parameter part**?

My controllers are:

     public ActionResult MemberHome(string id)
        {
            ViewBag.Details = id;
            return View();
        }
      public ActionResult MemberProfile(int id = 0)
        {
            MemberData md = new Member().GetMemberProfile(id);
            return PartialView(&quot;_ProfilePage&quot;,md);
        }


How can I pass parameters to a partial view in mvc 4

I believe this is pretty simple, I just can&#39;t seem to find the right way to show the display name for an item within a list within my model.

My simplified model:

    public class PersonViewModel
    {
        public long ID { get; set; }
        
        private List&lt;PersonNameViewModel&gt; names = new List&lt;PersonNameViewModel&gt;();

        [Display(Name = &quot;Names&quot;)]
        public List&lt;PersonNameViewModel&gt; Names { get { return names; } set { names = value; } }      
    }

and Names:

    public class PersonNameViewModel
    {
        public long ID { get; set; }

        [Display(Name = &quot;Set Primary&quot;)]
        public bool IsPrimary { get; set; }

        [Display(Name = &quot;Full Name&quot;)]
        public string FullName { get; set; }
    }

Now I&#39;d like to make a table to show all the names for a person, and get the `DisplayNameFor` `FullName`.  Obviously, 

    @Html.DisplayNameFor(model =&gt; model.Names.FullName);

wouldn&#39;t work, and

    @Html.DisplayNameFor(model =&gt; model.Names[0].FullName);  

will break if there are no names.  Is there a &#39;best way&#39; to obtain the display name here?

DisplayNameFor() From List&lt;Object&gt; in Model

I need to get the connection ID of a client. I know you can get it from the client side using `$.connection.hub.id`. What I need is to get in while in a web service I have which updates records in a database, in turn displaying the update on a web page. I am new to signalR and stackoverflow, so any advice would be appreciated. On my client web page I have this:

    &lt;script type=&quot;text/javascript&quot;&gt;
        $(function () {
            // Declare a proxy to reference the hub. 
            var notify = $.connection.notificationHub;
            
            // Create a function that the hub can call to broadcast messages.
            notify.client.broadcastMessage = function (message) {
                var encodedMsg = $(&#39;&lt;div /&gt;&#39;).text(message).html();// Html encode display message.
                $(&#39;#notificationMessageDisplay&#39;).append(encodedMsg);// Add the message to the page.
            };//end broadcastMessage
                     
            // Start the connection.
            $.connection.hub.start().done(function () {
                $(&#39;#btnUpdate&#39;).click(function () {
                    //call showNotification method on hub
                    notify.server.showNotification($.connection.hub.id, &quot;TEST status&quot;);
                });
            });

            
        });//End Main function

        
    &lt;/script&gt;

everything works up until I want to update the page using signalR. The show notification function in my hub is this:

    //hub function
    public void showNotification(string connectionId, string newStatus){               
        IHubContext context = GlobalHost.ConnectionManager.GetHubContext&lt;notificationHub&gt;();
        string connection = &quot;Your connection ID is : &quot; + connectionId;//display for testing
        string statusUpdate = &quot;The current status of your request is: &quot; + newStatus;//to be displayed
        //for testing, you can display the connectionId in the broadcast message
        context.Clients.Client(connectionId).broadcastMessage(connection + &quot; &quot; + statusUpdate);
    }//end show notification

how can I send the connectionid to my web service?

Hopefully I&#39;m not trying to do something impossible. Thanks in advance.



How to obtain connection ID of signalR client on the server side?

I want to have DropDownListFor in MVC

    @foreach (var item in Model)
    {
        @Html.DropDownListFor(modelItem =&gt; item.TitleIds, new SelectList(ViewBag.TitleNames as System.Collections.IEnumerable, &quot;TitleId&quot;, &quot;Title.TitleText&quot;), &quot;No: &quot; + ViewBag.MagNo, new { id = &quot;TitleIds&quot; })   
    }

in Controller

    public ActionResult ArticleList(int id)
    {
        ArticleWriter_ViewModel viewModel = new ArticleWriter_ViewModel();
        Func&lt;IQueryable&lt;NumberTitle&gt;, IOrderedQueryable&lt;NumberTitle&gt;&gt; orderByFunc = null;
        Expression&lt;Func&lt;NumberTitle, bool&gt;&gt; filterExpr = null;
        if (id &gt; 0)
        {
            filterExpr = p =&gt; p.MagazineId.Equals(id);
        }
        var wholeTitles = unitOfWork.NumberTitleRepository.Get(filterExpr,  orderByFunc, &quot;Magazine,Title&quot;).ToList();          

        ViewBag.MagNo = wholeTitles[0].Magazine.MagNo.ToString();
        ViewBag.MagId = wholeTitles[0].Magazine.Id;
        ViewBag.TitleNames = wholeTitles;

        return View(&quot;../Panel/Magazine/ArticleList&quot;, &quot;_BasicLayout&quot;, viewModel);
    }

but I get this error

&gt;  &#39;`System.Web.Mvc.HtmlHelper&lt;System.Collections.Generic.IEnumerable&lt;Cinemavaadabiat.ViewModel.ArticleWriter_ViewModel&gt;&gt;`&#39; has no applicable method named &#39;`DropDownListFor`&#39; but appears to have an extension method by that name. Extension methods cannot be dynamically dispatched. Consider casting the dynamic arguments or calling the extension method without the extension method syntax.

I can&#39;t understand the error, what should I check for it?



Extension methods cannot be dynamically dispatched

What is the exact difference between    

 1. Content-type: text/json 
 2. Content-type: application/json

I&#39;ve been using them randomly and never find any output difference in both http headers?



What is the exact difference between content-type: text/json and application/json?

I have to validate the `Content-Type` header value before passing it to an HTTP request.

Is there a specific list for all the possible values of `Content-Type`?

Otherwise, is there a way to validate the content type before using it in an HTTP request?


What are all the possible values for HTTP &quot;Content-Type&quot; header?

I have an ASP.NET Web API endpoint with controller action defined as follows : 

    [HttpPost]
    public HttpResponseMessage Post([FromBody] object text)

If my post request body contains plain text ( i.e. should not be interpreted as json, xml, or any other special format ), then I thought I could just include following header to my request : 

    Content-Type: text/plain

However, I receive error : 

    No MediaTypeFormatter is available to read an object of type &#39;Object&#39; from content with media type &#39;text/plain&#39;.

If I change my controller action method signature to : 

    [HttpPost]
    public HttpResponseMessage Post([FromBody] string text)

I get a slightly different error message : 

&gt; No MediaTypeFormatter is available to read an object of type &#39;String&#39; from content with media type &#39;text/plain&#39;.

how to post plain text to ASP.NET Web API endpoint?

JSON has [`application/json`][1] as a standard. For protobuf some people use [`application/x-protobuf`][2], but I saw something as odd as [`application/vnd.google.protobuf`][3] being proposed. Do we have an RFC or some other standard that I can use as a reference for this?


  [1]: https://stackoverflow.com/questions/477816/what-is-the-correct-json-content-type
  [2]: https://stackoverflow.com/questions/3190329/protocol-buffers-mime-problem
  [3]: https://groups.google.com/forum/#!topic/protobuf/VAoJ-HtgpAI

What is the correct Protobuf content type?

Curl by default adds headers such as `Content-type` and `User-agent`. Normally that is a good thing but I&#39;m trying to test what our server does when those headers are missing.

My problem is with the `Content-type` header. If it is missing, the server correctly assumes the user sent JSON. However, curl actually adds the missing header and incorrectly assumes that the content I am posting `application/x-www-form-urlencoded`. It also sends an Accept header of */* .

I suppose that is nice default behavior but I basically would like it to not send headers I did not specify. Is there an option for that?

    curl -v -X POST &#39;https://example.com&#39; -d &#39;{...}&#39;

    &gt; User-Agent: curl/7.37.1
    &gt; Host: domain.com
    &gt; Accept: */*
    &gt; Content-Length: 299
    &gt; Content-Type: application/x-www-form-urlencoded

Content Type	Original Author	Original Content on Stackoverflow
Question	Maxim Eliseev	View Question on Stackoverflow
Solution 1 - C#	Bob Van de Vijver	View Answer on Stackoverflow
Solution 2 - C#	Kevin	View Answer on Stackoverflow
Solution 3 - C#	Mick	View Answer on Stackoverflow

"application/json" constant in .NET framework

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Entity Framework Refresh context?

How to export a Vagrant virtual machine to transfer it

Attributions