C#: What is the difference between string interpolation and string.Format?

Interpolation — compile-time. Format — runtime.

Interpolation:

• Compile-time checked.
• Readable.
• Type-safe.

Format:

• Runtime.
• String-based.
• Less safe.

1// Interpolation
2var name = "Alice";
3var message = $"Hello, {name}!";
4
5// Format
6var message = string.Format("Hello, {0}!", name);

Key: Use interpolation for readability.