añadido Context de entity y correjidos algunos temas de las entidades

Modelo/Context.cs

@@ -0,0 +1,17 @@
+using Entidades;
+using Microsoft.EntityFrameworkCore;
+
+namespace Modelo;
+
+public class Context : Microsoft.EntityFrameworkCore.DbContext
+{
+    public DbSet<Categoria> Categorias { get; set; }
+    public DbSet<Cliente> Clientes { get; set; }
+    
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {   // Esto de poner credenciales sueltas está mal 
+        optionsBuilder.UseSqlServer(@"Server=fedesrv.ddns.net,1433;Database=ControlStockDAS;User Id=ProyectoDas;Password=<IL-:aQI?TK{uRw:AU>A?5?~*=Gux'}JT0me,z5Cf^f(s'-gy[G#-jt%b&uHe+/,$Gl>qkXl-c[@&e(\.V?[3)\w|aMH+<GnkIo*99MNJ}:L=j<T,^$`8J\dXw6>^67x;Trusted_Connection=False;Encrypt=False;Connection Timeout=5;");
+    }
+
+}
+

Modelo/IRepositorio.cs

@@ -1,12 +1,12 @@
 using System;
 using System.Collections.ObjectModel;
+using System.Diagnostics.Contracts;
 
 namespace Modelo
 {
     public abstract class IRepositorio<T>
     {
-        // Lista el contenido del repositorio
-        public IEnumerable<Student> Listar();
+        public IEnumerable<T> Listar();
         public abstract T ObtenerPorId(int Tid);
         public abstract void Add(T t);
         public abstract void Del(T t);

Modelo/Migrations/20240812181354_Initial.Designer.cs

@@ -0,0 +1,29 @@
+// <auto-generated />
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Modelo;
+
+#nullable disable
+
+namespace Modelo.Migrations
+{
+    [DbContext(typeof(Context))]
+    [Migration("20240812181354_Initial")]
+    partial class Initial
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.7")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);
+#pragma warning restore 612, 618
+        }
+    }
+}

Modelo/Migrations/20240812181354_Initial.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Modelo.Migrations
+{
+    /// <inheritdoc />
+    public partial class Initial : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}

Modelo/Migrations/ContextModelSnapshot.cs

@@ -0,0 +1,26 @@
+// <auto-generated />
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Modelo;
+
+#nullable disable
+
+namespace Modelo.Migrations
+{
+    [DbContext(typeof(Context))]
+    partial class ContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.7")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);
+#pragma warning restore 612, 618
+        }
+    }
+}

Modelo/Modelo/obj/Modelo.csproj.EntityFrameworkCore.targets

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Target Name="GetEFProjectMetadata">
+    <MSBuild Condition=" '$(TargetFramework)' == '' "
+             Projects="$(MSBuildProjectFile)"
+             Targets="GetEFProjectMetadata"
+             Properties="TargetFramework=$(TargetFrameworks.Split(';')[0]);EFProjectMetadataFile=$(EFProjectMetadataFile)" />
+    <ItemGroup Condition=" '$(TargetFramework)' != '' ">
+      <EFProjectMetadata Include="AssemblyName: $(AssemblyName)" />
+      <EFProjectMetadata Include="Language: $(Language)" />
+      <EFProjectMetadata Include="OutputPath: $(OutputPath)" />
+      <EFProjectMetadata Include="Platform: $(Platform)" />
+      <EFProjectMetadata Include="PlatformTarget: $(PlatformTarget)" />
+      <EFProjectMetadata Include="ProjectAssetsFile: $(ProjectAssetsFile)" />
+      <EFProjectMetadata Include="ProjectDir: $(ProjectDir)" />
+      <EFProjectMetadata Include="RootNamespace: $(RootNamespace)" />
+      <EFProjectMetadata Include="RuntimeFrameworkVersion: $(RuntimeFrameworkVersion)" />
+      <EFProjectMetadata Include="TargetFileName: $(TargetFileName)" />
+      <EFProjectMetadata Include="TargetFrameworkMoniker: $(TargetFrameworkMoniker)" />
+      <EFProjectMetadata Include="Nullable: $(Nullable)" />
+      <EFProjectMetadata Include="TargetFramework: $(TargetFramework)" />
+      <EFProjectMetadata Include="TargetPlatformIdentifier: $(TargetPlatformIdentifier)" />
+    </ItemGroup>
+    <WriteLinesToFile Condition=" '$(TargetFramework)' != '' "
+                      File="$(EFProjectMetadataFile)"
+                      Lines="@(EFProjectMetadata)" />
+  </Target>
+</Project>

Modelo/RepositorioCategoria.cs

@@ -1,4 +1,5 @@
-using Entidades;
+using System.Transactions;
+using Entidades;
 using Microsoft.EntityFrameworkCore;
 
 namespace Modelo
@@ -6,7 +7,6 @@ namespace Modelo
     public sealed class RepositorioCategoria : IRepositorio<Categoria>
     {
         private Context context;
-
         public RepositorioCategoria(Context context)
         {
             this.context = context;