How to dynamic new Anonymous Class?

Question

In C# 3.0 you can create anonymous class with the following syntax

var o1 = new { Id = 1, Name = "Foo" }; 

Is there a way to dynamic create these anonymous class to a variable?

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Example:

var o1 = new { Id = 1, Name = "Foo" }; var o2 = new { SQ = 2, Birth = DateTime.Now }; 

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Dynamic create Example:

var o1 = DynamicNewAnonymous(new NameValuePair("Id", 1), new NameValuePair("Name", "Foo")); var o2 = DynamicNewAnonymous(new NameValuePair("SQ", 2), new NameValuePair("Birth",  DateTime.Now)); 

Beacuse I need to do:

dynamic o1 = new ExpandObject();  o1."ID" = 1;    <--"ID" is dynamic name o1."Name" = "Foo";  <--"Name" is dynamic name 

And Scene1:

void ShowPropertiesValue(object o) {   Type oType = o.GetType();   foreach(var pi in oType.GetProperties())   {     Console.WriteLine("{0}={1}", pi.Name, pi.GetValue(o, null));   } } 

if I call:

dynamic o1 = new ExpandObject(); o1.Name = "123"; ShowPropertiesValue(o1); 

It can't show the result:

Name = 123 

And also I how to Convert the ExpandoObject to AnonymouseType ?

Type type = o1.GetType(); type.GetProperties();   <--I hope it can get all property of o1 

Last, I modify ShowPropertiesValue() method

void ShowPropertiesValue(object o) {   if( o is static object ) <--How to check it is dynamic or static object?   {     Type oType = o.GetType();     foreach(var pi in oType.GetProperties())     {       Console.WriteLine("{0}={1}", pi.Name, pi.GetValue(o, null));     }   }   else if( o is dynamic object )  <--How to check it is dynamic or static object?   {     foreach(var pi in ??? )  <--How to get common dynamic object's properties info ?     {       Console.WriteLine("{0}={1}", pi.Name, pi.GetValue(o, null));     }    } } 

How to implement DynamicNewAnonymous method or how to modify the ShowPropertiesValue()?

My motivations is:

dynamic o1 = new MyDynamic(); o1.Name = "abc"; Type o1Type = o1.GetType(); var props = o1Type.GetProperties(); <--I hope can get the Name Property 

If i can hook dynamicObject's GetType Method, and Compel convert to strongly-typed Type. The above Seamless code can work fine.

Answer 1

Anonymous types are just regular types that are implicitly declared. They have little to do with dynamic.

Now, if you were to use an ExpandoObject and reference it through a dynamic variable, you could add or remove fields on the fly.

edit

Sure you can: just cast it to IDictionary<string, object>. Then you can use the indexer.

You use the same casting technique to iterate over the fields:

dynamic employee = new ExpandoObject(); employee.Name = "John Smith"; employee.Age = 33;  foreach (var property in (IDictionary<string, object>)employee) {     Console.WriteLine(property.Key + ": " + property.Value); } // This code example produces the following output: // Name: John Smith // Age: 33 

The above code and more can be found by clicking on that link.