Parameter validation for a method using Roslyn

Question

I want to perform parameter validation at compile time for an extension method.

Something like this

Here is the sample code of my program to validate

public class Program
{
    static void Main(string[] args)
    {
        var sample = new Sample();
        var output = sample.SampleMethod("To Validate");  // I want to validate this param
    }
}

public static class Ext
{
    public static string SampleMethod(this Sample sample, string sampleParam)
    {
        return sampleParam + " Hello";
    }
}

public class Sample
{

}

I am planning to use Roslyn but I don't know the Action to register and to get the parameter value that passed.

Sample code to validate parameter for a method using Roslyn will be very helpful

score 1 · Accepted Answer · answered Jul 24 '19 at 11:28

You can use https://sharplab.io/ to look at the syntax tree of your code.

You might want to register an operation instead of an action:

context.RegisterOperationAction(YourAnalyzer, OperationKind.Invocation);

You can find lots of examples in these repos:

Parameter validation for a method using Roslyn

1 Answers1