NullReferenceException when trying to create a page

Radzen Blazor Studio
1

Dear Team,

I am evaluating Radzen Blazor Studio, I have a test model setup as defined below to evaluate Blazor's Studio to generate Pages in a code first Blazor Server .NET 8 application:

Here is how my model is structured:

using Microsoft.EntityFrameworkCore;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace TestBlazorApp1.Models
{
public class Student
{

    [Key]
    public string Id { get; set; } = "";

    [Index(IsUnique = false, IsClustered = true)]
    public DateTime EnrollmentDate { get; set; } = new DateTime();
    public ClassRoom StudentClass { get; set; } = new ClassRoom();


    [Index(IsUnique = false, IsClustered = true)]
    public string Name { get; set; } = "";

    public List<Subject> Subjects { get; set; } = new List<Subject>();
}

public class ClassRoom
{
    [Key]
    public int ClassID {  get; set; }
    public string ClassName { get; set; } = "";
    public string BuildingName { get; set; } = "";

}

public class Subject
{
    [Key]
    public string SubjectName { get; set; } = "";
    public string Teachedname { get; set; } = "";

    public List<Student> EnrolledStudents { get; set; } = new List<Student>();
}

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class IndexAttribute : Attribute
{
    public bool IsUnique { get; set; }
    public bool IsClustered { get; set; }
}

}

I have sqlite dbcontext setup as following:

using System;
using System.Linq;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
using TestBlazorApp1.Models;

namespace TestBlazorApp1.Data
{
public partial class TestSQLiteDbContext : DbContext
{
public DbSet Students { get; set; }
public DbSet ClassRooms { get; set; }
public DbSet Subjects { get; set; }

    public TestSQLiteDbContext()
    {
    }

    public TestSQLiteDbContext(DbContextOptions<TestSQLiteDbContext> options) : base(options)
    {
    }

    partial void OnModelBuilding(ModelBuilder builder);

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
        this.OnModelBuilding(builder);
    }

    protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder)
    {
        configurationBuilder.Conventions.Add(_ => new BlankTriggerAddingConvention());
    }


}

}

Whenever I try to generate a CRUD Page, I get a nullReferenceException:

image
image946×644 38.4 KB

All of my properties in the model are not null and I have added migration/updated database and can see the tables created there so there are no syntax errors and I can save/fetch data from these entities, but it seems I cannot get a page to be created using Radzen Blazor Studio, I als created a Blazor WASM .NET app aswell but faced exactly same issue,

What could be going wrong here, Any support would be appreciated.

Regards,
Nouman

2

Hi @N_Q,

Thank you for reporting this issue! We will address it with the next release.

By the way you can use markdown in this forum to format your code snippets. More info available here.

1 Like
3

HI @korchev

Thanks for your prompt reply, Any idea by when this would be released? I would love to run some more tests with Blazor Server/WASM once this is fixed.

Regards,
Nouman

4

The latest version contains a fix for that.