How can I use a percent % in FormatString without it multiplying by 100?

Question

I would like to format an integer as a percent without it multiplying by 100 as shown here. Because my source is an int, dividing it first by 100 is not a valid option. Is this possible?

[DisplayFormat(DataFormatString = "{0:#%}")]

Answer 1

You can escape the % character:

[DisplayFormat(DataFormatString = @"{0:#\%}")]

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Note that there are two ways to use \ as an escape character: if you prefix a string literal with the verbatim symbol (@), then \ characters are included in the string as-is, which means that as part of a format string a single \ will function as an escape character.

Without the @ verbatim symbol, \s are interpreted as escape strings by the compiler and as such need to be escaped themselves, as \\.

Pick one or the other, but not both:

@"{0:#\%}"  -> right
"{0:#\\%}"  -> right
@"{0:#\\%}" -> wrong

Answer 2

Put the % outside the {0:..}

[DisplayFormat(DataFormatString = "{0:0.00}%")]

Answer 3

From your linked page:

\ Escape character

Causes the next character to be interpreted as a literal rather than as a custom format specifier.

[DisplayFormat(DataFormatString = "{0:#\\%}")]