.NET string connection efficiency optimization

Program efficiency is crucial. String concatenation is a common operation, and choosing an efficient method can significantly improve performance.

According to .NET performance expert Rico Mariani, the best strategy depends on the connection mode:

Single-line connection

For single-line connection modes similar to x = f1(...) f2(...) f3(...) f4(...), the operation efficiency is very high. Using StringBuilder will not result in significant performance improvements.

Conditional connection

However, for conditional connection modes like if (...) x = f1(...), StringBuilder becomes an important optimization method. This is because StringBuilder amortizes the cost of creating a new string each time by performing a single connection in the background.

Further explanation

C# authoritative expert Eric Lippert also delves into the details of string concatenation. He emphasized the compiler's optimization of single-line connections, highlighting its efficiency.

In .NET, for the best string concatenation efficiency, remember the following points:

• Single-line connection: Use the direct connection operator.
• Conditional connection: Use StringBuilder.
• Consider using StringBuilder: For patterns that contain multiple connections, StringBuilder significantly improves performance.