How to create a public virtual string ToString(string format) in its class, so that it string.Format("{0:NNP}", x) , for example, to string.Format("{0:NNP}", x)

my method

 public virtual string ToString(string format) { if (format == "NNP") return "NNP format"; return ToString(); }

is not called with the aforementioned string.Format("{0:NNP}", x) , the standard public override string ToString() class is called instead. How to solve this problem

    1 answer 1

    Implement the IFormattable Interface

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