Final updates

CsvProcessor/CsvProcessor.csproj

@@ -9,4 +9,10 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="5.0.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="FakeData.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

CsvProcessor/Program.cs

@@ -12,7 +12,7 @@ static void Main(string[] args)
         {
             //ThreadPool.SetMaxThreads(100, 100);
             FileProcessor processor = new FileProcessor(new FakeWidgetLogic(), new FakeWidgetProvider());
-            processor.ProcessFileWithSemaphoreFixed(@"S:\Code\TaoOfCode\CsvProcessor\FakeData.txt").Wait();
+            processor.ProcessFileWithSemaphoreFixed(@".\FakeData.txt").Wait();
         }
 
 static void initial(string[] args)

Samples/SOLID/LSP/SomeBusinessService.cs

@@ -7,8 +7,9 @@ namespace Samples.SOLID.LSP
 {
 abstract class SomeBusinessServiceBase
 {
-    private List<SomeBusinessObject> _objects;
-    protected abstract void LoadData();
+    protected List<SomeBusinessObject> _objects;
+
+    public abstract void LoadData();
 
     public virtual void Render()
     {

Samples/SOLID/OCP/InvoiceService.cs

@@ -0,0 +1,69 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Samples.SOLID.OCP
+{
+    enum LineItemType
+    { 
+        Product, Service, Tax
+    }
+
+class LineItemValidator
+{
+    public bool IsValid(LineItem lineItem)
+    {
+        switch (lineItem.LineItemType)
+        {
+            case LineItemType.Product:
+                return ValidateProduct(lineItem);
+            case LineItemType.Service:
+                return ValidateService(lineItem);
+            case LineItemType.Tax:
+                return ValidateTax(lineItem);
+            default:
+                throw new Exception("unrecognized type");
+        }
+    }
+
+    private bool ValidateTax(LineItem lineItem)
+    {
+        return lineItem.Discount == 0;
+    }
+
+    private bool ValidateService(LineItem lineItem)
+    {
+        return lineItem.Description != null;
+    }
+
+    private bool ValidateProduct(LineItem lineItem)
+    {
+        return lineItem.Amount >= 0;
+    }
+}
+
+    abstract class LineItem 
+    {
+        public LineItemType LineItemType { get; set; }
+        public decimal Amount { get; set; }
+        public string Description { get; set; }
+        public decimal Discount { get; set; }
+    }
+
+    class ExtendableLineItemValidator
+    {
+        List<Func<LineItem, bool>> _validations = 
+            new List<Func<LineItem, bool>>();
+
+        void AddValidation(Func<LineItem, bool> validation)
+        {
+            _validations.Add(validation);
+        }
+
+        bool Validate(LineItem lineItem)
+        {
+            return _validations.All(v => v(lineItem));
+        }
+    }
+}

Samples/WhenThouYields/Linq/LinqExamples.cs

@@ -12,7 +12,10 @@ object CountExample(IEnumerable<object> someCollection)
         {
 if (someCollection.Count() > 1)
 {
-    //iterate the collection
+    foreach (var item in someCollection)
+    {
+        // do work
+    }
 }
 
 return new {