CODEWITHSUNDEEP
c#app-config
gymcode
gymcode

Reputation: 4633

C# Handling Exception Message Template in Config File

I have functions that sends out email messages using specific string formats for different messages.

Below is a sample:

String BodyText = "Information \r\n \r\n ID: " + id + " \r\n \r\n Title: " + title + " \r\n \r\n Description: " + description"

As the messages contain variables, is it possible for my message to be configurable in the config file?

Thank you.

Upvotes: 0

Views: 241

Answers (2)

Jaquez
Jaquez

Reputation: 920

Use String.Format and put your string into the config file like this:

<appSettings>
    <add key="BodyText" value="Information \r\n \r\n ID: {0}\r\n \r\n Title: {1}\r\n \r\n Description: {2}"/>
</appSettings>

Then you can use the value in code like this:

var bodyText = ConfigurationManager.AppSettings["BodyText"];
String.Format(bodyText, id, title, description);

Note, you will need to add a project reference to System.Configuration and then add the corresponding using statement to the file.

Upvotes: 1

Dessus
Dessus

Reputation: 2177

You have a few options here:

  1. You could parse variables in a string from config, giving something looking like this:

    My email here is sent to {{firstname}} etc.

    To implement this, you could do a regex search to inject variable values into your symbols ie {{firstname}} or alternately you could look at implementing something like the visitor gang of four pattern which will make a more unit testable setup where each variable is additive to code, as opposed to part of a hard-coded blob that needs modifying each time a variable is introduced.

  2. You could use Roslyn to pull the code in from config and just compile it on the fly. I would highly not recommend this due to the security and zillion error scenarios that could occur.

Upvotes: 1

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