What Is the Difference Between an Anonymous Type and a Regular Data Type C#?


Larry Thompson

What Is the Difference Between an Anonymous Type and a Regular Data Type in C#?

In C#, there are two types of data: regular data types and anonymous types. While both serve the purpose of storing and manipulating data, they differ in their structure, usage, and lifespan. Understanding the differences between these two types is crucial for writing efficient and organized code.

Regular Data Types

Regular data types, also known as named or explicitly typed variables, are the most commonly used type in C#. They are declared with a specific type and have a predefined structure.

Examples of regular data types include:

  • int: Used to store whole numbers.
  • string: Used to store sequences of characters.
  • float: Used to store decimal numbers with single precision.
  • bool: Used to store boolean values (true or false).

To declare a regular data type, you need to specify its name and assign a value to it. For example:

int age = 25;
string name = "John Doe";
bool isStudent = true;

You can then use these variables throughout your code by referencing their names.

Anonymous Types

In contrast to regular data types, anonymous types are dynamically created at runtime without explicitly defining their structure. They provide a convenient way to define lightweight objects without having to create a custom class explicitly. Anonymous types are primarily used for temporary or one-time use cases where you don’t need to reuse the structure elsewhere in your code.

Examples of anonymous types include:

  • var person = new { Name = “Jane Doe”, Age = 30 };
  • var product = new { Name = “Apple”, Price = 0.99 };

In the above examples, the structure of the anonymous types is defined implicitly using object initializer syntax. The properties in the anonymous types are defined using a name-value pair, similar to regular data types.

One key difference between anonymous types and regular data types is that you cannot explicitly declare the type of an anonymous type variable. Instead, you use the var keyword when declaring an anonymous type variable, and its type is inferred at compile-time based on the properties you define.

Usage and Lifespan

The usage and lifespan of regular data types and anonymous types also differ. Regular data types are typically used for long-term storage and manipulation of data throughout your codebase. You can pass them as arguments to methods, return them from functions, or store them in collections.

On the other hand, anonymous types are usually used for short-term or immediate needs within a limited scope. They are commonly used in LINQ queries to project specific properties from a larger dataset or to create ad-hoc structures without creating custom classes.


In summary, regular data types are explicitly declared with predefined structures and are suitable for long-term storage and manipulation of data. Anonymous types, on the other hand, are dynamically created at runtime without explicit structure definition and serve temporary or one-time use cases.

Understanding these differences will help you choose the appropriate type for your specific programming needs in C#.

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