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C# string format arguments

debugcn Published at Dev
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Drishti

I know that the following syntax works

String.Format("Today is {0}, {1}", day,month);

I was just curious how this format works?

String.Format("Today is {day}, {month}", day,month);

How does C# interpret replacing number with user defined names?

Scott Chamberlain 
String.Format("Today is {day}, {month}", day,month);

Does not work, it throws a System.FormatException.

According to the documentation the replacement fields must be in the format { index[,alignment][:formatString]} which your 2nd example does not follow.

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