Blazor server side empty objects in dataportal

[Mikael-Pothier]

Hello,

I am new to Blazor and I am trying to insert an object using the dataportal. I create the object using this code

                var newCourtier = Courtier.NewCourtier();

                newCourtier.NoCourtier = courtierToAdd.NoCourtier;
                newCourtier.Adresse1 = courtierToAdd.Adresse1;
                newCourtier.Province = courtierToAdd.Province;
                newCourtier.CodePostal = courtierToAdd.CodePostal;
                newCourtier.Email = courtierToAdd.Email;

                return Task.Run(() => newCourtier.SaveAsync()).Result;

When it goes in SaveAsync, it seems to create a new object because when it goes into DataPortal_Insert() my object is empty.

Thank you for your help.

[rockfordlhotka]

I'd expect the code to be more like this:

  var newCourtier = await Courtier.NewCourtierAsync();

  newCourtier.NoCourtier = courtierToAdd.NoCourtier;
  newCourtier.Adresse1 = courtierToAdd.Adresse1;
  newCourtier.Province = courtierToAdd.Province;
  newCourtier.CodePostal = courtierToAdd.CodePostal;
  newCourtier.Email = courtierToAdd.Email;

  return await newCourtier.SaveAsync();

Client-side Blazor is single threaded (like browsers, JavaScript, and WebAssembly), so I have no idea what happens if you try to do Task.Run stuff.

[Mikael-Pothier]

Yes the class works outside of blazor we have a test program and it tests the CRUD operation and all of them are working in the courtier class.

For the courtier class the code is made from a code generator(codesmith) and the class inherits from BusinessBase and all the property looks like this one

private static readonly PropertyInfo<System.Int16> _noCourtierProperty = RegisterProperty<System.Int16>(p => p.NoCourtier, "No Courtier", RelationshipTypes.PrivateField);`
        
private System.Int16 _noCourtier = _noCourtierProperty.DefaultValue;`

        [System.ComponentModel.DataObjectField(true, false)]
        public System.Int16 NoCourtier
        {
            get { return GetProperty(_noCourtierProperty, _noCourtier); }
            set { SetProperty(_noCourtierProperty, ref _noCourtier, value); }
        }

[rockfordlhotka]

Is this with a local or remote data portal? Also, can you share your CSLA config from Startup.cs?

[rockfordlhotka]

Ahh, yes, sorry, haven't used private backing fields for an extremely long time, and some extra work is required when using them with MobileFormatter.

Your class needs to override OnGetState and OnSetState to get/set the private backing field into the serialization stream. Something like this in your business class:

    protected override void OnGetState(SerializationInfo info, StateMode mode)
    {
      info.AddValue(_noCourtierProperty.Name, _noCourtier);
      base.OnGetState(info, mode);
    }

    protected override void OnSetState(SerializationInfo info, StateMode mode)
    {
      _noCourtier = info.GetValue<Int16>(_noCourtierProperty.Name);
      base.OnSetState(info, mode);
    }

This is because CSLA (especially in Blazor) uses MobileFormatter by default. Microsoft is phasing out BinaryFormatter, which is what used to be the default, and so CSLA is following Microsoft's lead.

So your options are:

1. Stop using private backing fields; CSLA handles managed backing fields automatically
2. Modify your code-gen templates to override the get/set methods
3. If you have a custom base class between (for example) BusinessBase and your business class, you can add a bit of reflection in reusable get/set methods to auto-get/set all private backing fields (this was discussed in a different thread within the last few weeks)

[Mikael-Pothier]

I removed the managed backing fields and now the save work.

I have another question

since we are using Blazor we used appSetting.json instead of app.config and we cannot use the ConfigurationManager for the connectionstring and since we are not using entityframework we couldn't make it work with services.AddDbContext. We found a way to do it, but I'm not sure if it's the best practice.

What we did was to set in the Configure(IApplicationBuilder app, IWebHostEnvironment env) of startup.cs we set the connectionstring in or databaseHelperclass (with the one we set in appsettings.json) like this
Library.ADOHelper.ConnectionString = Configuration.GetConnectionString("TestPrimacoConnectionString");
Do you know a better way or this way is valid?

Thank you for your help!!!

[rockfordlhotka]

I'm glad this is working for you. I think it best if you post your new question in its own thread.