Know the Core Difference Between String and String in C#

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The Difference Between String and String in C#

So what is the difference between string and String types in C#? The answer is actually very simple. String is just a pseudonym (alias) for the System.String. So, technically, there is no difference. Just as there is no difference between “int” and System.Int32.

As for the code formatting style, here is some advice. Usually, it is recommended to use string when you are referring to an object:

string object = “Table”;

But in case you need to refer to a class, it is better to use the uppercase string:

string message = String.Format(“This is, {0}!”, object);

This is the style which Microsoft uses in their examples.

The picture shows the full list of aliases. The only type that does not have a nickname is System.IntPtr; it is always necessary to write the full name.

However, there is one case where it is necessary to use aliases: in explicit type declaration for the transfer:
public enum Foo : UInt32 {} // wrong

public enum Bar : uint {} // right
Also it is recommended to treat the typec with caution when you implement any API which can be used by clients in other languages. For example, ReadInt32 method is quite straightforward, while ReadInt is not. Anyone who uses your API can use the language in which the int is 16 or 64-bit, which does not coincide with your implementation. This is excellent advice that is followed by developers .Net Framework, and good examples can be found in classes BitConverter, BinaryReader, and Convert.


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