How to use string interpolation in a resource file?

Question

I would like to use a resource file to send an email. In my resource file I used a variable "EmailConfirmation" with the value "Hello {userName} ... "

In my class I used:

public static string message (string userName)
{
   return Resource.WebResource.EmailConfirmation
}

The problem is that the return says "Hello {userName}" instead of "Hello Toto".

Efferent

String interpolation only works with string literals. – Interlunation

Answer 1

You can't make use of string interpolation in the context of resources. However you could achieve that you want by making use of string.Format. Write to your resource file something like this:

Hello {0}

and then use it like below:

public static string message (string userName)
{
   return string.Format(Resource.WebResource.EmailConfirmation, userName);
}

Update

You can add as many parameters as you want. For instance:

Hello {0}, Confirm your email: {1}

And then you can use it as:

string.Format(Resource.WebResource.EmailConfirmation
    , userName
    , HtmlEncoder.Default.Encode(link))

Pye

yes, I thought of it, but it actually is more complex because in my variable "EmailConfirmation" I used this : "Hello {userName}, Confirm your email : {HtmlEncoder.Default.Encode(link)}" And "HtmlEncoder.Default.Encode" is not taken in cocideration – Efferent

Answer 2

If you really want to use placeholders like that instead of digits (I understand...) then you can do this:

return Resource.WebResource.EmailConfirmation.Replace("{userName}",userName)

You can keep daisychaining .Replace commands for additional placeholders that you use.

return Resource.WebResource.EmailConfirmation.Replace("{userName}",userName).Replace("{loginDate}",loginDate).Replace("{notes}",notes)

Tadtada