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

Differences and best practices between String and string in C#

In C#, you may encounter two ways of writing "string" and "String". Although they look similar, they represent different aspects of string processing.

Technical Differences

"string" is an alias for the System.String class in C#. This means that when you use "string", you are actually referring to an object of type System.String. "String" on the other hand directly represents the System.String class itself.

So, technically there is no functional difference between using "string" and "String". They all point to the same underlying type.

Recommended usage

While there is no technical difference, the guidelines recommend using specific forms in different contexts:

• string: Use "string" when you refer to a string object. This is especially common with variable declarations and assignments.

  For example:

  <code class="language-csharp">  string message = "欢迎使用该程序！";</code>

• String: Use "String" when you need to explicitly reference the System.String class itself. This is most commonly used for working with class-specific methods and properties.

  For example:

  <code class="language-csharp">  String formattedMessage = String.Format("您的订单总计为 {0:C}", amount);</code>

Microsoft style

Microsoft tends to use the following style in its examples:

• "string" is used for string objects
• "String" for System.String class

Note: StyleCop, a tool used to enforce C# coding standards, now enforces the use of C#-specific aliases such as "string".

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