I'm trying to execute this method:
public async Task<List<JobDetail>?> GetJobDetailsByJobIdAsync(int JobId){ using ApplicationDbContext context = await _factory.CreateDbContextAsync(); var jobDetails = await context.JobDetails .Where(q => q.JobId == JobId) .ToListAsync(); return jobDetails;}Every time that var jobDetails line is executed, I get this error:
System.NullReferenceException: Object reference not set to an instance of an object.
JobId always has a valid value.
This is the JobDetail model class:
public partial class JobDetail : IAuditable{ public int Id { get; set; } public byte[] RowVersion { get; set; } = null!; public int LineNumber { get; set; } public string? Standard { get; set; } public int Qty { get; set; } = 1; public string? Description { get; set; } public string? DrawingNumber { get; set; } public string? Size { get; set;} public string? BatchReference { get; set; } public decimal UnitPrice { get; set; } public bool Certificate { get; set; } public string? Notes { get; set; } public int Released { get; set; } public int Balance { get; set; } public int JobId { get; set; } public int? MaterialId { get; set; } public int? ProcessId { get; set; } public decimal LineTotal { get; set; } public decimal LineTotalRemaining { get; set; } public string? CreatedBy { get; set; } public DateTimeOffset? Created { get; set; } public string? ModifiedBy { get; set; } public DateTimeOffset? Modified { get; set; } public virtual ICollection<DespatchDetail> DespatchDetails { get; set; } = new List<DespatchDetail>(); public virtual Job Job { get; set; } = null!; public virtual Material? Material { get; set; } public virtual Process? Process { get; set; } public virtual ICollection<SalesDetail> SalesDetails { get; set; } = new List<SalesDetail>();}And this is the table definition in the DbContext:
public virtual DbSet<JobDetail> JobDetails { get; set; }modelBuilder.Entity<JobDetail>(entity =>{ entity.Property(e => e.BatchReference).HasMaxLength(255); entity.Property(e => e.CreatedBy).HasMaxLength(255); entity.Property(e => e.Description) .HasMaxLength(255) .HasDefaultValue(""); entity.Property(e => e.Size) .HasMaxLength(255) .HasDefaultValue(""); entity.Property(e => e.DrawingNumber).HasMaxLength(255); entity.Property(e => e.JobId).HasColumnName("JobDetail_Job"); entity.Property(e => e.MaterialId).HasColumnName("JobDetail_Material"); entity.Property(e => e.ProcessId).HasColumnName("JobDetail_Process"); entity.Property(e => e.LineTotal).HasColumnType("decimal(18, 2)"); entity.Property(e => e.LineTotalRemaining).HasColumnType("decimal(18, 2)"); entity.Property(e => e.ModifiedBy).HasMaxLength(255); entity.Property(e => e.RowVersion) .IsRowVersion() .IsConcurrencyToken(); entity.Property(e => e.Standard).HasMaxLength(255); entity.Property(e => e.UnitPrice).HasColumnType("decimal(18, 2)"); entity.HasOne(d => d.Job).WithMany(p => p.JobDetails) .HasForeignKey(d => d.JobId) .HasConstraintName("JobDetail_Job"); entity.HasOne(d => d.Material).WithMany(p => p.JobDetails) .HasForeignKey(d => d.MaterialId) .HasConstraintName("JobDetail_Material"); entity.HasOne(d => d.Process).WithMany(p => p.JobDetails) .HasForeignKey(d => d.ProcessId) .HasConstraintName("JobDetail_Process");});Everything seems to look fine to me. It should just return the collection of JobDetail for a Job where q.JobId == JobId.
However, as mentioned above every time that line is hit, it throws the exception.
A little context however, this is an old Lightswitch app that is being rewritten in Blazor. I took the models and DbContext configuration from Lightswitch. This has worked perfectly for the other 25+ tables so don't see any real reason why that should cause an issue but I just wanted to point that out.
There are 10,000s records in that table. Please tell me I'm missing something glaringly obvious because it's driving me insane.
Stack trace before the line executes:
And after: