格式化是指定的，但参数不是IFormattable

Question

string listOfItemPrices = items.ToSemiColonList(item => string.Format("{0:C}", item.Price.ToString()));

I am simply trying to format the price here to 2 decimal places. Ok, so the string.Format doesn't implement IFormattable? Ok not sure how to get around this so that I can format the decimal (price) here.

Answer 1

By passing item.Price.ToString() to String.Format , you are passing a string , not a decimal.
Since strings cannot be used with format strings, you're getting an error.

You need to pass the Decimal value to String.Format by removing .ToString() .

Answer 2

There is no point using string.format here, that is used for adding formatted values into strings. eg

String.Format("This is my first formatted string {O:C} and this is my second {0:C}",ADecimal,AnotherDecimal)

If you just want the value of a decimal variable as a formatted string then just pass the string formatter to the ToString() method eg

ADecimal.ToString("C");