CODEWITHSUNDEEP
c#.netfilehelpers
Ronnel
Ronnel

Reputation: 656

How do you do custom validation on FileHelpers?

I want to throw an exception to say that we have an invalid email address as I dont want to proceed until we get a valid email address. Is this where I want to do it and if so, how?

void Engine_AfterReadRecord(EngineBase engine, FileHelpers.Events.AfterReadEventArgs<UserInfoFromAd> e){
     bool isEmailValid = IsEmailValid(e.Record.Email);
     if (!isEmailValid){
        //I want to throw exception
     }
 }

Upvotes: 2

Views: 2320

Answers (2)

shamp00
shamp00

Reputation: 11326

Throwing the exception in the AfterReadRecord event is fine, but you need to set the ErrorMode to SaveAndContinue. This tells the engine to save the error to Engine.ErrorManager.Errors and continue importing. After the import you can process the errors.

Here is an example program:

[DelimitedRecord("|")]
public class MyClass
{
    public string Field1 { get; set; }
    public int Field2 { get; set; }
    public string Email { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        var engine = new FileHelperEngine<MyClass>();
        engine.AfterReadRecord += new FileHelpers.Events.AfterReadHandler<MyClass>(engine_AfterReadRecord);
        engine.ErrorMode = ErrorMode.SaveAndContinue;
        // import a record with an invalid Email
        MyClass[] validRecords = engine.ReadString("Hello|23|World");
        ErrorInfo[] errors = engine.ErrorManager.Errors;
        Assert.AreEqual(1, engine.TotalRecords); // 1 record was processed
        Assert.AreEqual(0, validRecords.Length); // 0 records were valid
        Assert.AreEqual(1, engine.ErrorManager.ErrorCount); // 1 error was found
        Assert.That(errors[0].ExceptionInfo.Message == "Email is invalid");
    }

    static bool IsEmailValid(string email)
    {
        return false;
    }

    static void engine_AfterReadRecord(EngineBase engine, FileHelpers.Events.AfterReadEventArgs<MyClass> e)
    {
        bool isEmailValid = IsEmailValid(e.Record.Email);
        if (!isEmailValid)
        {
            throw new Exception("Email is invalid");
        }
    }
}

Upvotes: 3

pabdulin
pabdulin

Reputation: 35255

What seems to be the problem? Just throw it: 

if (!isEmailValid)
{
    throw new InvalidDataException("Email is not valid.");
}

Upvotes: 1

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