C# String Formatting: string.Format Guide

In C#, you can use the string.Format method to format strings. This method takes a format string and a series of parameters, and then formats these parameters according to the specifications of the format string.

For example, here is a simple illustration:

int number = 42;
string name = "Alice";
string formattedString = string.Format("Hello, {0}! Your favorite number is {1}.", name, number);
Console.WriteLine(formattedString);

In the example above, we used the string.Format method to format name and number into a string, resulting in Hello, Alice! Your favorite number is 42.

In the string.Format method, the format string can contain placeholders {0}, {1}, {2}, etc., corresponding to the first, second, third parameters in the argument list, and so on. Different format specifiers can be used to specify the output format, for example, {0:C} formats the first parameter as currency.

In C#, besides using the string.Format method, you can also use string interpolation to format strings, for example:

string formattedString = $"Hello, {name}! Your favorite number is {number}.";
Console.WriteLine(formattedString);

This method is relatively more concise and straightforward, but it may not be convenient to use in certain specific situations.