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String vs. string in C#: What's the Difference and When Should I Use Which?

Linda Hamilton

Feb 02, 2025 am 08:16 AM

String vs. string in C#: What's the Difference and When Should I Use Which?

The difference between the string and string in the c# and the best practice

In the development of C#, the difference between "String" and "String" is often confusing. This article aims to clarify the differences between the two and instruct them to use the correct usage.

What is the difference between the two?

From technical point of view, there is no difference between "string" and "string" in C#, they all point to the same underlying class.

Recommended usage

System.String

Although the two can be exchanged, the best practice suggests to distinguish its usage:

String:

Used to declare string objects, for example:

String: Use only when it needs to be referenced by the class itself, for example:

string message = "欢迎来到 C#!";

Early C# development is more inclined to use "string", but this guide has developed. Microsoft and industry experts now recommend using C# specific aliases, such as "String". System.String

STYLECOP rules

String formattedMessage = String.Format("消息：{0}", message);

STYLECOP, a popular C# code analysis tool, forced the use of C# specific alias, including "string". Following this agreement can improve the consistency and readability of the code. Summary

The difference between understanding "string" and "string" helps developers to write clear and standardized C# code. If you have any questions, use "string" as the default selection, and use "String" only when referenced the underlying class. Following these guidelines, developers can follow the best practice in the industry and help maintain the maintenance of the code library.

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