How Can Named String Formatting Be Achieved in C#?

Named String Formatting in C

Python's string formatting syntax allows for formatting by name rather than position, enabling developers to use variable names directly within format strings. In C#, however, the built-in String.Format does not support this feature.

Custom Solutions

To achieve named string formatting in C#, you can implement your own method using reflection or template parsing techniques.

Using Reflection:

string myString = "{foo} is {bar} and {yadi} is {yada}".Inject(o);

Using Template Parsing:

Status.Text = "{UserName} last logged in at {LastLoginDate}".FormatWith(user);

An Improved Method:

public class FormattedString
{
    private readonly string _template;

    public FormattedString(string template)
    {
        _template = template;
    }

    public string FormatWith(object o)
    {
        var type = o.GetType();
        var props = type.GetProperties();

        return _template.Replace("{PropertyName}", prop.GetValue(o))
                        .Replace("{propertyName}", prop.GetValue(o))
                        .ToString();
    }
}

Usage:

var formattedString = new FormattedString("{foo} is {bar} and {yadi} is {yada}");
Console.WriteLine(formattedString.FormatWith(new { foo = "alpha", bar = "beta", yadi = "gamma", yada = "delta" }));

String Interpolation (C# 6 and later)

With the release of C# 6 in 2015, string interpolation was introduced as a built-in feature that allows for named string formatting. The syntax resembles the custom methods discussed above:

$"{{some_variable}}: {{some_other_variable}}"

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