Introduction
Anonymous types as the name suggests, help us to create an object without declaring its data type. Since name of the data type is not specified that the type is referred to as an anonymous type.
We have lot of resources around us on this concept, but I still see some confusion and arguments on this concept that made me to write this blog post. I will try to explain it in simple words so that a novice can understand the basics of the concept.
VB.NET
C#.NET
The above code snippet is an anonymous declaration in VB. We can notice that the as key word is not required to declare it.
Visual Studio Editor is user-friendly to give us the IntelliSense as below. Once you declared the type then you can access all the properties.
When the above code reaches the complier these are the steps that are done internally.
If we look at the IL Code and we can examine it and understand in detail as explained
The given code-snippet creates a variable called Emp. This Emp is assigned to an instance of anonymous type that has LastName, FirstName and Country as properties.
To Access Anonymous Type
That is very simple as we access non anonymous types.
VB.NET
C#.NET
This will give us the necessary output
Anonymous types as the name suggests, help us to create an object without declaring its data type. Since name of the data type is not specified that the type is referred to as an anonymous type.
We have lot of resources around us on this concept, but I still see some confusion and arguments on this concept that made me to write this blog post. I will try to explain it in simple words so that a novice can understand the basics of the concept.
VB.NET
1.Emp = New With {2. .EmplD = 123, 3. .FName = "Hima", 4. .LName = “Vejella” , 5. .Country = "India"6. }C#.NET
1.var Emp = new { 2. FirstName = "Hima", 3. LastName = "Vejella", 4. DOJ = DateTime.Now, 5. EMPCode = 150 6. };Visual Studio Editor is user-friendly to give us the IntelliSense as below. Once you declared the type then you can access all the properties.
When the above code reaches the complier these are the steps that are done internally.
- Compiler automatically generates anonymous class.
- It anonymously instantiate an object that contains the properties in anonymous type
- The instantiated object is assigned to the anonymous type variable "Emp"
If we look at the IL Code and we can examine it and understand in detail as explained
01..class private auto ansi sealed VB$AnonymousType_0`402. extends [mscorlib]System.Object03.{04. .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilerGeneratedAttribute::.ctor() 05. = ( 01 00 00 00 ) 06. .custom instance void [mscorlib]System.Diagnostics.DebuggerDisplayAttribute::.ctor(string)07. = ( 08. 01 00 3E 45 6D 70 6C 44 3D 7B 45 6D 70 6C 44 7D // ..>EmplD={EmplD}09. 2C 20 46 4E 61 6D 65 3D 7B 46 4E 61 6D 65 7D 2C // , FName={FName},10. 20 4C 4E 61 6D 65 3D 7B 4C 4E 61 6D 65 7D 2C 20 // LName={LName}, 11. 43 6F 75 6E 74 72 79 3D 7B 43 6F 75 6E 74 72 79 // Country={Country12. 7D 00 00 13. ) 14.// }..15.} // end of class VB$AnonymousType_0`4To Access Anonymous Type
That is very simple as we access non anonymous types.
VB.NET
1.MessageBox.Show(Emp.FirstName & " " & Emp.LastName & " " & Emp.Country)
1.Console.WriteLine(Emp.FirstName + “Emp.LastName” + ”Emp.DOJ” + “Emp.EmpCode” );
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