Is there a “String.Format” that can accept named input parameters instead of index placeholders? [duplicate]

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In C# 6 you can use string interpolation:

string name = "Lisa";
int age = 20;
string str = $"Her name is {name} and she's {age} years old";

As Doug Clutter mentioned in his comment, string interpolation also supports format string. It’s possible to change the format by specifying it after a colon. The following example will output a number with a comma and 2 decimal places:

var str = $"Your account balance is {balance:N2}"

As Bas mentioned in his answer, string interpolation doesn’t support template string. Actually, it has no built in support for that. Fortunately it exists in some great libraries.

SmartFormat.NET for example has support for named placeholders:

Smart.Format("{Name} from {Address.City}, {Address.State}", user)

// The user object should at least be like that 

public class User
{
    public string Name { get; set; }
    public Address Address { get; set; }
}

public class Address
{
    public string City { get; set; }
    public string State { get; set; }
}

It is available on NuGet and has excellent documentation.

Mustache is also a great solution. Bas has described its pros well in his answer.

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