Alizer Posts - Answer Overflow

Alizer

•Created by Alizer on 6/20/2024 in #help

mapping a dynamic object to an existing object and only map properties that exist in the source obj

I need help with patching an object in ASP Core, on my api i only send a partial data of the object i want to update, i looked into JsonPatchDocument<T> but the syntax is too complicated compared to what my competitors do with their API, what i want here is just for my customers to send a json with the properties and values they want to change and that's it, let's say i have an object like

public class Car
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [Key]
    [MaxLength(Constants.MaxStringLength)]
    public string? Id { get; set; }

    public string? Model { get; set; }

    public string? CompanyName { get; set; }

    // omitted 10+ properties
}

public class Car
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [Key]
    [MaxLength(Constants.MaxStringLength)]
    public string? Id { get; set; }

    public string? Model { get; set; }

    public string? CompanyName { get; set; }

    // omitted 10+ properties
}

and in my API I only want to update specific properties, so I decided to take a dynamic object in my action

    [HttpPatch]
    [Route("{id}")]
    public async Task<IActionResult> UpdateCarByIdAsync(string id, [FromBody] dynamic car)
    {   
        
        var tenants = await _tenants.UpdateCarFromDynamic(id, car);
        // omitted code

    [HttpPatch]
    [Route("{id}")]
    public async Task<IActionResult> UpdateCarByIdAsync(string id, [FromBody] dynamic car)
    {   
        
        var tenants = await _tenants.UpdateCarFromDynamic(id, car);
        // omitted code

in my update method i have this code

    public async Task<Car?> UpdateCarFromDynamic(string id, dynamic car)
    {
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<dynamic, Car>().ForAllMembers(x =>
            {
                x.Condition((src, dest, srcMember) => { return srcMember != null; });
            });
            
        });

        var mapper = _personUserConfiguration.CreateMapper();

        var existingUser =
            await _applicationDbContext.Cars.FirstOrDefaultAsync(x => x.IsActive && x.Id == id);

        mapper.Map(car, existingCar);
        
        // omitted code

    public async Task<Car?> UpdateCarFromDynamic(string id, dynamic car)
    {
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<dynamic, Car>().ForAllMembers(x =>
            {
                x.Condition((src, dest, srcMember) => { return srcMember != null; });
            });
            
        });

        var mapper = _personUserConfiguration.CreateMapper();

        var existingUser =
            await _applicationDbContext.Cars.FirstOrDefaultAsync(x => x.IsActive && x.Id == id);

        mapper.Map(car, existingCar);
        
        // omitted code

now, for some reason existingCar has all properties turned to their default or null values, how should i fix this? is there an alternative library for doing this

11 replies

CC#

•Created by Alizer on 1/15/2024 in #help

advanced inheritance in arguments

3 replies

CC#

•Created by Alizer on 1/10/2024 in #help

Scaffold Not Working because `dotnet-aspnet-codegenerator.exe` uses old C# version

I need help with scaffolding identity my C# project, I get this error whenever I scaffold


D:\ProjectFolder\ClientAction(81,37): error CS1002: ; expected

and I look into the line that causes this and I found it it's caued by the new required keyword

    public class ClientAction
    {
        public required string Description { get; set; } // the required keyword causes this!
    }

    public class ClientAction
    {
        public required string Description { get; set; } // the required keyword causes this!
    }

The project builds successfully in dotnet rider, no problems at all, however when it runs dotnet-aspnet-codegenerator.exe to scaffold I get a lot of errors, I'm thinking it's caued by dotnet-aspnet-codegenerator.exe using an old c# version, currently I use .net 7.0 Now my problem is that I have around 100+ properties using required and I needed to scaffold the Identity to edit the register and login pages, how do I get around this?

5 replies

CC#

•Created by Alizer on 8/6/2023 in #help

❔ I need help making a `diff` of 2 objects of the same class

I have a complex class like below

public class Person {
  public string Name { get; set; }

  public byte Age { get; set; }

  public List<Person>? Children { get; set; }

// many other properties omitted
}

public class Person {
  public string Name { get; set; }

  public byte Age { get; set; }

  public List<Person>? Children { get; set; }

// many other properties omitted
}

Now, I have 2 instances of this class Person and I want to get the differences between both, my problem is the Person class is a really complex class, it has around 20+ properties, some properties are collections, I made a class like below to record the differences

public class Difference {
  public string PropertyPath { get; set; }

  public object OriginalValue { get; set; }

  public object NewValue { get; set; }
}

public class Difference {
  public string PropertyPath { get; set; }

  public object OriginalValue { get; set; }

  public object NewValue { get; set; }
}

my question is, how do I start with this? if there is a library that does this automatically I would use it

4 replies

CC#

•Created by Alizer on 7/31/2023 in #help

❔ Return PartialView with ``for`` attribute

I have a complex <form> in my .cshtml file and I want to simplify it more, now I have this original code, this is inside the <form>

                    <div class="container-fluid mx-0 px-0">
                        @foreach (var assistanceData in  i.Assistances)
                        {
                            var assistanceDataIndex = i.Assistances.IndexOf(assistanceData);
                            <p class="mb-1 fw-normal">@assistanceData.Name</p>
                            <partial for="Assistances[assistanceIndex].Assistances[assistanceDataIndex]" name="Encoder/AssistanceDataForm"/>
                        }
                    </div>

                    <div class="container-fluid mx-0 px-0">
                        @foreach (var assistanceData in  i.Assistances)
                        {
                            var assistanceDataIndex = i.Assistances.IndexOf(assistanceData);
                            <p class="mb-1 fw-normal">@assistanceData.Name</p>
                            <partial for="Assistances[assistanceIndex].Assistances[assistanceDataIndex]" name="Encoder/AssistanceDataForm"/>
                        }
                    </div>

now instead of doing a foreach loop I want to add these <partial/> views with the click of a button, I plan on doing this by making a controller return the partial view and I'll just append it to the parent div via an ajax call using jquery, I have the following action in the controller below

c#
    public async Task<IActionResult> AssistanceDataForm(Assistance parentAssistance, int assistanceIndex, int assistanceDataIndex)
    {
        return PartialView("Encoder/AssistanceDataForm", assistanceData);
    }

c#
    public async Task<IActionResult> AssistanceDataForm(Assistance parentAssistance, int assistanceIndex, int assistanceDataIndex)
    {
        return PartialView("Encoder/AssistanceDataForm", assistanceData);
    }

this returns the partial view but how do I add for="parentAssistance[assistanceIndex].Assistances[assistanceDataIndex]" in the PartialView? Is this even possible? If not could there be another way around it?

7 replies

CC#

•Created by Alizer on 7/30/2023 in #help

✅ Retain form tag helper names inside partial view

I want to retain a form tag helper's name inside a partial view, I have a massive form model with lots of nested objects, below is just a simplified version of what I wanted to do I have a form below, this works because Name.FirstName is being handled correctly by ASP automatically setting the name of the <input/> tag, my controller parses this correct into a Member object

@model Member
<form>
    <div class="form-floating flex-grow-1">
        <input asp-for="Name.FirstName" class="form-control border-0 bg-subtle" placeholder="name@example.com">
        <label asp-for="Name.FirstName">
            <i class="fa-solid fa-person me-2"></i>First Name
        </label>
        <span asp-validation-for="Name.FirstName" class="text-danger fw-normal"></span>
    </div>
</form>

@model Member
<form>
    <div class="form-floating flex-grow-1">
        <input asp-for="Name.FirstName" class="form-control border-0 bg-subtle" placeholder="name@example.com">
        <label asp-for="Name.FirstName">
            <i class="fa-solid fa-person me-2"></i>First Name
        </label>
        <span asp-validation-for="Name.FirstName" class="text-danger fw-normal"></span>
    </div>
</form>

but since my form is massive, I wanted to split it to multiple sections, now I put the Name property inside another partial view like below

// _NameSection.cshtml partial view
@model Name
<div class="form-floating flex-grow-1">
        <input asp-for="FirstName" class="form-control border-0 bg-subtle" placeholder="name@example.com">
        <label asp-for="FirstName">
            <i class="fa-solid fa-person me-2"></i>First Name
        </label>
        <span asp-validation-for="FirstName" class="text-danger fw-normal"></span>
</div>

// _NameSection.cshtml partial view
@model Name
<div class="form-floating flex-grow-1">
        <input asp-for="FirstName" class="form-control border-0 bg-subtle" placeholder="name@example.com">
        <label asp-for="FirstName">
            <i class="fa-solid fa-person me-2"></i>First Name
        </label>
        <span asp-validation-for="FirstName" class="text-danger fw-normal"></span>
</div>

and below is the main form's .cshtml file

// Main form .cshtml page view
@model Member
<form>
  <partial name="_NameSection"/>
</form>

// Main form .cshtml page view
@model Member
<form>
  <partial name="_NameSection"/>
</form>

and for some reason this breaks ASP's automatically set name for the <input/> tag, it just sets the input's name to FirstName when it should be Name.FirstName, how do I fix this?

3 replies

CC#

•Created by Alizer on 6/5/2023 in #help

How do I pass data from my partial view to my main layout in ASP Core?

I have this code in my partial view:

// Partial View Lesson.html
@{
    ViewData["LessonTitle"] = "Lesson 1";
}

// Partial View Lesson.html
@{
    ViewData["LessonTitle"] = "Lesson 1";
}

Now I want to pass this data to my main layout.

// Main _Layout.cshtml
<html>
  <body>
    <partial name="Lesson"/>
    <h1>@ViewData["LessonTitle"]</h1>
  </body>
</html>

// Main _Layout.cshtml
<html>
  <body>
    <partial name="Lesson"/>
    <h1>@ViewData["LessonTitle"]</h1>
  </body>
</html>

What I want to do here is to set ViewData["LessonTitle"] in my partial layout and get that data in my _Layout.cshtml but I get the error NullReferenceException: Object reference not set to an instance. specifically on the <h1>@ViewData["LessonTitle"]</h1> line, if I remove that line I don't get any error at all so I believe I can't pass data from partial view to layout via ViewData....? If I can't, how do I pass data from my partial to my main layout?

1 replies

CC#

•Created by Alizer on 4/28/2023 in #help

❔ what the proper way to check if ``dynamic`` has a specific property?

I have this code below

dynamic modelObject = new { Count = 0 };

dynamic modelObject = new { Count = 0 };

now I'm passing this as a @model to a partial view

@model dynamic

<div class="container-fluid">
    <p>
        <!-- Check if @@Model has a property named ``Count`` -->
    </p>
</div>

@model dynamic

<div class="container-fluid">
    <p>
        <!-- Check if @@Model has a property named ``Count`` -->
    </p>
</div>

how do i properly check if modelObject has a property named Count? I searched for solutions online and most require me to turn it into a Dictionary BUT I DONT WANT TO DO THAT!! casting it to dictionary is just....redundant and doesn't feel right, anyways, is there a proper way to do it?

16 replies

CC#

•Created by Alizer on 4/1/2023 in #help

❔ How do I use a .cshtml (or Razor View) from a class library?

I wanted to make a modular ASP Core project, I wanted to make some kind of 'plugin system' for me project, basically some Razor views will be stored in class libraries, but currently I don't know how to do it, I followed the instruction at the Microsoft docs and Controllers work, I was able to add a controller class to my library and make it return a 200 OK on a specific route, however Razor views don't work, the following below is my code for importing .dll files

var pluginAssemblies =
    Directory.GetFiles(Path.Combine(AppContext.BaseDirectory), "plugin/*.dll", SearchOption.AllDirectories);

// Load DLL plugins.
foreach (var pluginAssembly in pluginAssemblies)
{
    try
    {
        var assemblyLoadContext = new AssemblyLoadContext(Path.GetFileName(pluginAssembly));
        var assembly = assemblyLoadContext.LoadFromAssemblyPath(pluginAssembly);
        var pluginTypes = assembly.GetTypes().Where(type => typeof(PluginBase).IsAssignableFrom(type));

        foreach (var pluginType in pluginTypes)
        {
            builder.Services.AddScoped(typeof(IPlugin), pluginType);
            builder.Services.AddControllersWithViews()
                .AddApplicationPart(pluginType.Assembly)
                .AddRazorRuntimeCompilation();
            
            builder.Services.Configure<MvcRazorRuntimeCompilationOptions>(o =>
            {
                o.FileProviders.Add(new EmbeddedFileProvider(pluginType.Assembly));
            });

            builder.Services.AddRazorPages().AddApplicationPart(pluginType.Assembly)
                .AddRazorRuntimeCompilation();
        }
    }
    catch (Exception ex)
    {
    }
}

var pluginAssemblies =
    Directory.GetFiles(Path.Combine(AppContext.BaseDirectory), "plugin/*.dll", SearchOption.AllDirectories);

// Load DLL plugins.
foreach (var pluginAssembly in pluginAssemblies)
{
    try
    {
        var assemblyLoadContext = new AssemblyLoadContext(Path.GetFileName(pluginAssembly));
        var assembly = assemblyLoadContext.LoadFromAssemblyPath(pluginAssembly);
        var pluginTypes = assembly.GetTypes().Where(type => typeof(PluginBase).IsAssignableFrom(type));

        foreach (var pluginType in pluginTypes)
        {
            builder.Services.AddScoped(typeof(IPlugin), pluginType);
            builder.Services.AddControllersWithViews()
                .AddApplicationPart(pluginType.Assembly)
                .AddRazorRuntimeCompilation();
            
            builder.Services.Configure<MvcRazorRuntimeCompilationOptions>(o =>
            {
                o.FileProviders.Add(new EmbeddedFileProvider(pluginType.Assembly));
            });

            builder.Services.AddRazorPages().AddApplicationPart(pluginType.Assembly)
                .AddRazorRuntimeCompilation();
        }
    }
    catch (Exception ex)
    {
    }
}

2 replies

CC#

•Created by Alizer on 2/10/2023 in #help

❔ Any good persistent data solution for .net core 6 c#?

Back in .NET framework I use settings and the Properties.Settings.Default namespace to store data in just about a line of code but looks like I cannot use it with the new .net core 6, is there like a library or just a good way of storing persistent user data in .net core? something that doesnt require me to use a database

12 replies

CC#

•Created by Alizer on 12/17/2022 in #help

❔ how do I get the mouse position in MacOS

I can do it in Windows via the Cursor class but how do I do it in MacOS? every google search results points to Unity but I need to do it in .NET 6

3 replies

CC#

•Created by Alizer on 12/14/2022 in #help

❔ how to get the current selected text from any window just like how clipboard does it?

I want to simulate Ctrl + C without pressing Ctrl + C, basically able to read any selected text from any window be it a browser, notepad or word, most solutions I found online requires me to call SendKeys to do Ctrl + C every mouse release but some programs (such as VLC media player) performs a different action if Ctrl + C is pressed, and hell, I have no idea if text is even being selected in the first place, so currently my question is, how do I simulate clipboard copy without pressing Ctrl + C?

6 replies

CC#

•Created by Alizer on 10/31/2022 in #help

how to add a table to an existing ef core database created using EnsureCreated()?

I have an existing SQLite database (30GB in size) which was created using EnsureCreated(), now I need to add a table which I tried using migrations (I passed dotnet ef database update) on the command line but it causes Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 1: 'table "AspNetRoles" already exists'. error, I did a lot of research and it seems like I needed to create the database via migrations. How do I add a table when the ef core database is created via EnsureCreated()? Do I have to create the db via migrations and fill it with data from the existing db? can there be a way in which I can add the table be it via code?

4 replies

CC#

•Created by Alizer on 10/1/2022 in #help

Does DbSet.FirstOrDefaultAsync return a tracked entity?

I have the following code below

var existingCreator = await _dbContext.ContentCreators.FirstOrDefaultAsync(x => x.Name == creator.Name);

var existingCreator = await _dbContext.ContentCreators.FirstOrDefaultAsync(x => x.Name == creator.Name);

is changing properties inside existingCreator going to also change the record inside the sql server?

5 replies

CC#

•Created by Alizer on 9/16/2022 in #help

where does the default ASP Core with Identity put the registration and login form?

3 replies

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