What does this C# string format mean?

From my previous question, Converting ch开发者_StackOverflowinese character to Unicode, I had a good answer but with some code I didn't understand:

Console.WriteLine("U+{0:x4}", (int)myChar);

Could anyone explain this?

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Console.WriteLine("U+{0:x4}", (int)myChar);

is the equivalent to the call:

Console.WriteLine("U+{0}", ((int)myChar).ToString("x4"));

In a format string, the : indicates that the item should be displayed using the provided format. The x4 part indicates that the integer should be printed in its hexadecimal form using 4 characters. Refer to standard numeric format strings for more information.

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The 0 indicates which positional argument to substitute. The x displays a hexadecimal number, the 4 has it display four digits.

For example, the character ȿ (LATIN SMALL LETTER S WITH SWASH TAIL, codepoint 575) is printed as U+023F since 575₁₀ = 23F₁₆.

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That will simply create the literal string "U+1234"... now if you are wanting to convert a unicode code point into a char, you want Convert.ToChar(myChar)

http://msdn.microsoft.com/en-us/library/3hkfdkcx.aspx