string. Format without decimal places will generate unexpected rounding - C ＃

I need to update some existing code , In order to （ Conditionally ） Display numbers without decimal places .

According to whether it is necessary to “£” The symbol uses the following two lines .

currency = string.Format(CultureInfo.CurrentCulture, "{0:£#,0.00}", data);

or

currency = string.Format(CultureInfo.CurrentCulture, "{0:#,0.00}", data);

I try to change this code to use {0：£＃,0}, And after deleting the decimal places ,“ data ” value 23699.99 Round to 23700, instead of 23699.

I try to {0：£＃,0} Try to understand what happened , And then again 23699.99 Round to 23700.

Can anyone explain why this happens ？

Thank you first .

Reference plan

When formatting numbers , It will always be rounded to the nearest number with the accuracy you choose . for example , If you set the format to one decimal place , be 0.86 Round to 0.9, and 0.96 Round to 1.0.

Again , If you print without decimal digits , be 23699.99 Round to 23700, because 23700 There is no decimal place closest 23699.99 The number of .

If you want to round , Please use Math.Floor.

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