iformattable

String formatting in C#; Can I use it? Yes. Can I implement custom formatting? No. I need to write something where I can pass a set of custom formatting options to string.Format , which will have some effect on the particular item. at the moment I have something like this: string.Format("{0}", item); but I want to be able to do things with that item: string.Format("{0:lcase}", item); // lowercases the item string.Format("{0:ucase}", item); // uppercases the item string.Format("{0:nospace}", item); // removes spaces I know I can do things like .ToUpper() , .ToLower() etc. but I need to do it

FormattableString has been Introduced in C# 6.0. As we can use same string formatting using string object why is there need of using FormattableString or IFormattable . Whats difference between three? My Code var name = "Pravin"; var s = $"Hello, {name}"; System.IFormattable s1 = $"Hello, {name}"; System.FormattableString s2 = $"Hello, {name}"; Above all there produces same result. i.e 'Hello Pravin'. Can I get more elaborated answer on this if anyone has deep knowledge on same. FormattableString is a new type in .NET 4.6, and the compiler will only use it if you try to use it. In other words,

Is there a good reference implementation for IFormattable ? I plan to have at least one custom IFormatProvider for my object, and I want to make sure that the wiring is correct for the different possible parameter sets passed to IFormattable.ToString(string, IFormatProvider) . What I have so far: public class MyDataClass : IFormattable { /// <seealso cref="IFormattable.ToString(string, IFormatProvider)"/> public string ToString(string format, IFormatProvider formatProvider) { ICustomFormatter formatter = (ICustomFormatter)formatProvider.GetFormat(typeof(ICustomFormatter)); return formatter