Is it possible to have an anonymous type implement an interface?

I&#39;ve got a piece of code that I would like to work, but don&#39;t know how to do this.

I&#39;ve had a couple of answers that either say no, or create a class that implements the interface construct new instances of that. This isn&#39;t really ideal, but I&#39;m wondering if there is a mechanism to create a thin dynamic class on top of an interface which would make this simple.

    public interface DummyInterface
    {
        string A { get; }
        string B { get; }
    }

    public class DummySource
    {
        public string A { get; set; }
        public string C { get; set; }
        public string D { get; set; }
    }

    public class Test
    {
        public void WillThisWork()
        {
            var source = new DummySource[0];
            var values = from value in source
                         select new
                         {
                             A = value.A,
                             B = value.C + &quot;_&quot; + value.D
                         };

            DoSomethingWithDummyInterface(values);

        }

        public void DoSomethingWithDummyInterface(IEnumerable&lt;DummyInterface&gt; values)
        {
            foreach (var value in values)
            {
                Console.WriteLine(&quot;A = &#39;{0}&#39;, B = &#39;{1}&#39;&quot;, value.A, value.B);
            }
        }
    }

I&#39;ve found an article [Dynamic interface wrapping][1] that describes one approach. Is this the best way of doing this?


  [1]: http://channel8.msdn.com/Posts/Adding-some-dynamic-to-C-interface-wrapping/

Can anonymous class implement interface?

In C# 3.0 you can create anonymous class with the following syntax

    var o = new { Id = 1, Name = &quot;Foo&quot; };

Is there a way to add these anonymous class to a generic list?

Example:

    var o = new { Id = 1, Name = &quot;Foo&quot; };
    var o1 = new { Id = 2, Name = &quot;Bar&quot; };
    
    List&lt;var&gt; list = new List&lt;var&gt;();
    list.Add(o);
    list.Add(o1);

Another Example:

    List&lt;var&gt; list = new List&lt;var&gt;();

    while (....)
    {
        ....
        list.Add(new {Id = x, Name = y});
        ....
    }

A generic list of anonymous class

Lets say I have a concrete class Class1 and I am creating an anonymous class out of it.

    Object a = new Class1(){
            void someNewMethod(){
            }
          };

Now is there any way I could overload the constructor of this anonymous class. Like shown below

    Object a = new Class1(){
            void someNewMethod(){
            }
            public XXXXXXXX(int a){
              super();
              System.out.println(a);
            }
          };

With something at xxxxxxxx to name the constructor?

Accessing constructor of an anonymous class

I&#39;m attempting to use the following code to serialize an anonymous type to JSON:

    var serializer = new DataContractJsonSerializer(thing.GetType());
    var ms = new MemoryStream();
    serializer.WriteObject(ms, thing);
    var json = Encoding.Default.GetString(ms.ToArray()); 

However, I get the following exception when this is executed:

&gt; Type
&gt; &#39;&lt;&gt;f__AnonymousType1`3[System.Int32,System.Int32,System.Object[]]&#39;
&gt; cannot be serialized. Consider marking
&gt; it with the DataContractAttribute
&gt; attribute, and marking all of its
&gt; members you want serialized with the
&gt; DataMemberAttribute attribute.  See
&gt; the Microsoft .NET Framework
&gt; documentation for other supported
&gt; types.

I can&#39;t apply attributes to an anonymous type (as far as I know).  Is there another way to do this serialization or am I missing something? 

How do I serialize a C# anonymous type to a JSON string?

How can I pass anonymous types as parameters to other functions? Consider this example:

    var query = from employee in employees select new { Name = employee.Name, Id = employee.Id };
    LogEmployees(query);

The variable `query` here doesn&#39;t have strong type. How should I define my `LogEmployees` function to accept it?

    public void LogEmployees (? list)
    {
        foreach (? item in list)
        {
    
        }
    }

In other words, what should I use instead of `?` marks.

How to pass anonymous types as parameters?

I&#39;m getting the following error:

&gt; &#39;object&#39; does not contain a definition for &#39;RatingName&#39;

When you look at the anonymous dynamic type, it clearly does have RatingName.

![Screenshot of Error][1]

I realize I can do this with a Tuple, but I would like to understand why the error message occurs.

  [1]: http://i.stack.imgur.com/nafnk.png

Dynamic Anonymous type in Razor causes RuntimeBinderException

So I have a collection of objects.  The exact type isn&#39;t important.  From it I want to extract all the unique pairs of a pair of particular properties, thusly:

    myObjectCollection.Select(item=&gt;new
                                    {
                                         Alpha = item.propOne,
                                         Bravo = item.propTwo
                                    }
                     ).Distinct();

So my question is:  Will Distinct in this case use the default object equals (which will be useless to me, since each object is new) or can it be told to do a different equals (in this case, equal values of Alpha and Bravo =&gt; equal instances)?  Is there any way to achieve that result, if this doesn&#39;t do it? 

LINQ Select Distinct with Anonymous Types

I have this:

    List&lt;object&gt; nodes = new List&lt;object&gt;(); 
    
    nodes.Add(
    new {
    	Checked		= false,
    	depth		= 1,
    	id			= &quot;div_&quot; + d.Id
    });


... and I&#39;m wondering if I can then grab the &quot;Checked&quot; property of the anonymous object.  I&#39;m not sure if this is even possible.  Tried doing this:

`if (nodes.Any(n =&gt; n[&quot;Checked&quot;] == false))`  ... but it doesn&#39;t work.

Thanks




How to access property of anonymous type in C#?

I have a query that returns an anonymous type and the query is in a method. How do you write this:

    public &quot;TheAnonymousType&quot; TheMethod(SomeParameter)
    {
      using (MyDC TheDC = new MyDC())
      {
         var TheQueryFromDB = (....
                               select new { SomeVariable = ....,
                                            AnotherVariable = ....}
                               ).ToList();

          return &quot;TheAnonymousType&quot;;
        }
    }



Returning anonymous type in C#

In C# 3.0 you can create anonymous class with the following syntax

    var o1 = new { Id = 1, Name = &quot;Foo&quot; };

Is there a way to dynamic create these anonymous class to a variable?

----------
Example:

    var o1 = new { Id = 1, Name = &quot;Foo&quot; };
    var o2 = new { SQ = 2, Birth = DateTime.Now };

----------
Dynamic create Example:&lt;br/&gt;

    var o1 = DynamicNewAnonymous(new NameValuePair(&quot;Id&quot;, 1), new NameValuePair(&quot;Name&quot;, &quot;Foo&quot;));
    var o2 = DynamicNewAnonymous(new NameValuePair(&quot;SQ&quot;, 2), new NameValuePair(&quot;Birth&quot;, 
    DateTime.Now));

Beacuse I need to do:

    dynamic o1 = new ExpandObject(); 
    o1.&quot;ID&quot; = 1;    &lt;--&quot;ID&quot; is dynamic name
    o1.&quot;Name&quot; = &quot;Foo&quot;;  &lt;--&quot;Name&quot; is dynamic name

And Scene1:

    void ShowPropertiesValue(object o)
    {
      Type oType = o.GetType();
      foreach(var pi in oType.GetProperties())
      {
        Console.WriteLine(&quot;{0}={1}&quot;, pi.Name, pi.GetValue(o, null));
      }
    }

if I call:

    dynamic o1 = new ExpandObject();
    o1.Name = &quot;123&quot;;
    ShowPropertiesValue(o1);

It can&#39;t show the result:

    Name = 123

And also I how to Convert the ExpandoObject to AnonymouseType ?

    Type type = o1.GetType();
    type.GetProperties();   &lt;--I hope it can get all property of o1


Last, I modify ShowPropertiesValue() method

    void ShowPropertiesValue(object o)
    {
      if( o is static object ) &lt;--How to check it is dynamic or static object?
      {
        Type oType = o.GetType();
        foreach(var pi in oType.GetProperties())
        {
          Console.WriteLine(&quot;{0}={1}&quot;, pi.Name, pi.GetValue(o, null));
        }
      }
      else if( o is dynamic object )  &lt;--How to check it is dynamic or static object?
      {
        foreach(var pi in ??? )  &lt;--How to get common dynamic object&#39;s properties info ?
        {
          Console.WriteLine(&quot;{0}={1}&quot;, pi.Name, pi.GetValue(o, null));
        } 
      }
    }


How to implement DynamicNewAnonymous method or how to modify the ShowPropertiesValue()?&lt;/br&gt;

My motivations is:

    dynamic o1 = new MyDynamic();
    o1.Name = &quot;abc&quot;;
    Type o1Type = o1.GetType();
    var props = o1Type.GetProperties(); &lt;--I hope can get the Name Property

If i can hook dynamicObject&#39;s GetType Method, and Compel convert to strongly-typed Type.
The above Seamless code can work fine.











How to dynamic new Anonymous Class?

First, and to make things clearer I&#39;ll explain my scenario from the top:

I have a method which has the following signature:

    public virtual void SendEmail(String from, List&lt;String&gt; recepients, Object model)

What I want to do is generate an anonymous object which has the properties of the model object along with the first two parameters as well. Flattening the model object into a PropertyInfo[] is very straightforward. Accordingly, I thought of creating a Dictionary&lt;string, object&gt; which would hold the PropertyInfo&#39;s and the first two params, and then be converted into the anonymous object where the key is the name of the property and the value is the actual value of the property.

Is that possible? Any other suggestions?

Convert Dictionary&lt;string, object&gt; To Anonymous Object?

Code below is working well as long as I have class `ClassSameAssembly` in same assembly as class `Program`.
But when I move class `ClassSameAssembly` to a separate assembly, a `RuntimeBinderException` (see below) is thrown.
Is it possible to resolve it?    

    using System;

    namespace ConsoleApplication2
    {
        public static class ClassSameAssembly
        {
            public static dynamic GetValues()
            {
                return new
                {
                    Name = &quot;Michael&quot;, Age = 20
                };
            }
        }

        internal class Program
        {
            private static void Main(string[] args)
            {
                var d = ClassSameAssembly.GetValues();
                Console.WriteLine(&quot;{0} is {1} years old&quot;, d.Name, d.Age);
            }
        }
    }

`Microsoft.CSharp.RuntimeBinder.RuntimeBinderException`: **&#39;object&#39; does not contain a definition for &#39;Name&#39;**

    at CallSite.Target(Closure , CallSite , Object )
    at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0)
    at ConsoleApplication2.Program.Main(String[] args) in C:\temp\Projects\ConsoleApplication2\ConsoleApplication2\Program.cs:line 23


C# ‘dynamic’ cannot access properties from anonymous types declared in another assembly

I know I can&#39;t write a method like:

    public var MyMethod()
    {
       return new{ Property1 = &quot;test&quot;, Property2=&quot;test&quot;};
    }

I can do it otherwise:

    public object MyMethod()
    {
       return new{ Property1 = &quot;test&quot;, Property2=&quot;test&quot;}
    }

but I don&#39;t want to do the second option because, if I do so, I will have to use reflection.

&lt;hr /&gt;

Why I want to do that:

Today i have a method inside my aspx page that returns a datatable as result and I **cannot change it**, I was trying to convert this DataTable to an Anonymous method with the properties that I want to work with. I didn&#39;t want to create a class only to do that and as I will need to perform the same query more than one time, I Thought to create a method that returns an anonymous type would be a good ideia.





Is there a way to return Anonymous Type from method?

I have the following anonymous type:

    new {data1 = &quot;test1&quot;, data2 = &quot;sam&quot;, data3 = &quot;bob&quot;}

I need a method that will take this in, and output key value pairs in an array or dictionary. 

My goal is to use this as post data in an HttpRequest so i will eventually concatenate in into the following string:

    &quot;data1=test1&amp;data2=sam&amp;data3=bob&quot;




In c# convert anonymous type into key/value array?

Is there any way to declare a list object of anonymous type. I mean

    List&lt;var&gt; someVariable = new List&lt;var&gt;();
    someVariable.Add(
                 new{Name=&quot;Krishna&quot;, 
                     Phones = new[] {&quot;555-555-5555&quot;, &quot;666-666-6666&quot;}}
                    );

This is because I need to create a collection at runtime.

Declaration of Anonymous types List

I have the following method which serialises an object to a HTML tag. I only want to do this though if the type isn&#39;t Anonymous.

    private void MergeTypeDataToTag(object typeData)
    {
        if (typeData != null)
        {
            Type elementType = typeData.GetType();

            if (/* elementType != AnonymousType */)
            {
                _tag.Attributes.Add(&quot;class&quot;, elementType.Name);    
            }

            // do some more stuff
        }
    }

Can somebody show me how to achieve this?

Thanks

How To Test if a Type is Anonymous?

I&#39;m debugging some Python that takes, as input, a list of objects, each with some attributes.

I&#39;d like to hard-code some test values -- let&#39;s say, a list of four objects whose &quot;foo&quot; attribute is set to some number.

Is there a more concise way than this?

    x1.foo = 1
    x2.foo = 2
    x3.foo = 3
    x4.foo = 4
    myfunc([x1, x2, x3, x4])

Ideally, I&#39;d just like to be able to say something like:

    myfunc([&lt;foo=1&gt;, &lt;foo=2&gt;, &lt;foo=3&gt;, &lt;foo=4&gt;])

(Obviously, that is made-up syntax. But is there something similar that really works?)

Note: This will never be checked in. It&#39;s just some throwaway debug code. So don&#39;t worry about readability or maintainability.

Is it possible to create anonymous objects in Python?

What does such an expression mean?

    obj.DataSource = new[]
    {
        new {Text = &quot;Silverlight&quot;, Count = 10, Link=&quot;/Tags/Silverlight&quot; },
        new {Text = &quot;IIS 7&quot;, Count = 11, Link=&quot;http://iis.net&quot; },
        new {Text = &quot;IE 8&quot;, Count = 12, Link=&quot;/Tags/IE8&quot; },
        new {Text = &quot;C#&quot;, Count = 13, Link=&quot;/Tags/C#&quot; },
        new {Text = &quot;Azure&quot;, Count = 13, Link=&quot;?Tag=Azure&quot; }
    };

Especially these lines: new {Text = &quot;IIS 7&quot;... }

How can I create an array like this manually to suit this DataSource.

C# and arrays of anonymous objects

In Go, is there a way to satisfy an interface anonymously? It doesn&#39;t seem like there is, but this was my best attempt.

(In the [Playground][1])

    package main

    import &quot;fmt&quot;

    type Thing interface {
        Item() float64
        SetItem(float64)
    }

    func newThing() Thing {
        item := 0.0
        return struct {
            Item (func() float64)
            SetItem (func(float64))
        }{
            Item: func() float64 { return item },
            SetItem: func(x float64) { item = x },
        }
    }

    func main() {
        thing := newThing()
        fmt.Println(&quot;Hello, playground&quot;)
        fmt.Println(thing)
    }


  [1]: http://play.golang.org/p/4i-8o087dg

Anonymous interface implementation in Golang

I want to take an anonymous object as argument to a method, and then iterate over its properties to add each property/value to a a dynamic `ExpandoObject`.  

So what I need is to go from 

    new { Prop1 = &quot;first value&quot;, Prop2 = SomeObjectInstance, Prop3 = 1234 }

to knowing names and values of each property, and being able to add them to the `ExpandoObject`.

How do I accomplish this?

Side note: This will be done in many of my unit tests (I&#39;m using it to refactor away a lot of junk in the setup), so performance is to some extent relevant. I don&#39;t know enough about reflection to say for sure, but from what I&#39;ve understood it&#39;s pretty performance heavy, so if it&#39;s possible I&#39;d rather avoid it...

**Follow-up question:**
As I said, I&#39;m taking this anonymous object as an argument to a method. What datatype should I use in the method&#39;s signature? Will all properties be available if I use `object`?

How do I iterate over the properties of an anonymous object in C#?

I wanna create an anonymous type that I can set the property name dynamically. it doesn&#39;t have to be an anonymous type. All I want to achieve is set any objects property names dynamically. It can be ExpandoObject, but dictionary will not work for me.

What are your suggestions?

Creating an anonymous type dynamically?

I had the following problem today, and I was wondering if there is a solution for my problem.

My idea was to build anonymous classes and use it as a datasource for a WinForm BindingSource:

    public void Init()
    {
        var option1 = new
                      {
                          Id = TemplateAction.Update,
                          Option = &quot;Update the Templates&quot;,
                          Description = &quot;Bla bla 1.&quot;
                      };

        var option2 = new
                      {
                          Id = TemplateAction.Download,
                          Option = &quot;Download the Templates&quot;,
                          Description = &quot;Bla bla 2.&quot;
                      };

        var list = new[] {option1, option2}.ToList();

        bsOptions.DataSource = list; // my BindingSource

        // cboTemplates is a ComboBox
        cboTemplates.DataSource = bsOptions; 
        cboTemplates.ValueMember = &quot;Id&quot;;
        cboTemplates.DisplayMember = &quot;Option&quot;;

        lblInfoTemplates.DataBindings.Add(&quot;Text&quot;, bsOptions, &quot;Description&quot;);
    }

That works fine so far.

The problem I had is to get Id out of the &quot;Current&quot; property of the BindingSource, because I can&#39;t cast it back to the Anonymous Type:

    private void cmdOK_Click(object sender, EventArgs e)
    {
        var option = (???)bsOptions.Current;
    }

I guess there is no way to find out the type of &quot;Current&quot; and access the &quot;Id&quot; Property?
Maybe someone has a good solution...

I know there are other (and also better) ways to get the Id (Reflection, reading the value from the ComboBox, not using anonymous tpyes,...) I&#39;m just courious if it&#39;s possible to get the Type out of bsOptions.Current in an elegant way.


Cast to Anonymous Type

I understood that anonymous types are marked private by the compiler and the properties are read-only. Is there a way to serialize them to xml (without deserialize) ? It [works with JSON][1], how can I do it with XML?


  [1]: https://stackoverflow.com/questions/331976/how-do-i-serialize-a-c-anonymous-type-to-a-json-string

Can I serialize Anonymous Types as xml?

What is wrong with this code-snippet?

    class Program
    {
        static void Main(string[] args)
        {
            var obj = new { Name = &quot;A&quot;, Price = 3.003 };
                
            obj.Name = &quot;asdasd&quot;;
            obj.Price = 11.00;
    
            Console.WriteLine(&quot;Name = {0}\nPrice = {1}&quot;, obj.Name, obj.Price);
    
            Console.ReadLine();
        }
    }

I am getting the following errors:

    Error	5	Property or indexer &#39;AnonymousType#1.Name&#39; cannot be assigned to -- it is read only	.....\CS_30_features.AnonymousTypes\Program.cs	65	13	CS_30_features.AnonymousTypes
    Error	6	Property or indexer &#39;AnonymousType#1.Price&#39; cannot be assigned to -- it is read only	.....\CS_30_features.AnonymousTypes\Program.cs	66	13	CS_30_features.AnonymousTypes

How to re-set values into an anonymous type object?

All Anonymous Types Solutions on Gang of Coders

Total of 24 Anonymous Types Solutions