Introduction

IFormattable Interface provides functionality to format the value of an object into a string representation. A simple example using a record demonstrates how to display different properties, along with formatting and calculations.

record used

  • "A" or "Age" => $"{BirthDay.GetAge()}" does a calculation
  • "B" => $"{BirthDay:O}" does special date formatting

Source code

Usage

usage for above

Output

results

Applies to

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10, 11
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

Summary

To dive deeper, read Microsoft documentation

Note that the content is intentionally short to make it easier to learn.