Azure Functions PlayFab Error Handling

ErrorHandlingExample.cs

public static class ErrorHandlingExample
{
    [FunctionName("ErrorHandlingExample")]
    public static async Task<dynamic> RunAsync(
        [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest req, ILogger log)
    {
        var errorOccurred = true;
        if(errorOccurred)
        {
          return new PlayFabErrorObjectResult(1000, "An error has occurred");        
        }
    }
}

PlayFabErrorObjectResult.cs

/// <summary>
/// Allows us to return an "Error Object" in PlayFab.
/// <see href="https://community.playfab.com/questions/61892/how-do-we-return-an-error-from-azure-functions.html"/>
/// <remarks>
/// This is necessary due to the fact that PlayFab wont let us "error out" on expected bad input. Therefore this
/// provides us with a way to verify errors with a valid result callback.  
/// </remarks>
/// </summary>
public class PlayFabErrorObjectResult
{
    /// <summary>
    /// Creates a new error object result
    /// </summary>
    /// <param name="code">The code that maps to our error</param>
    /// <param name="message">The error message</param>
    public PlayFabErrorObjectResult(int code, string message)
    {
        Error = new PlayFabError
        {
            Code = code,
            Message = message
        };
    }
    
    /// <summary>
    /// The error that will be sent along to our client
    /// </summary>
    public PlayFabError Error { get; set; }

    public struct PlayFabError
    {
        /// <summary>
        /// The code that maps to our error
        /// </summary>
        public int Code { get; set; }
        /// <summary>
        /// The message explaining our error
        /// </summary>
        public string Message { get; set; }
    }
}

Using the above, client side we can then check for the presence of the "error" key in in our ExecuteFunctionResult.FunctionResult property. In this manner we should more or less have a consistent way to check for expected errors.

This is similar to the method I use in my PlayFabClientAPITaskWrapper repo. You can check out the code for that below

• https://github.com/Breakstep-Studios/playfab-client-api-task-wrapper/blob/master/Runtime/Models/PlayFabCloudScriptResponse.cs