first commit

MyNewProjectName.Domain/Exceptions/DomainException.cs

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+namespace MyNewProjectName.Domain.Exceptions;
+
+/// <summary>
+/// Base exception for domain layer
+/// </summary>
+public class DomainException : Exception
+{
+    public DomainException()
+    {
+    }
+
+    public DomainException(string message)
+        : base(message)
+    {
+    }
+
+    public DomainException(string message, Exception innerException)
+        : base(message, innerException)
+    {
+    }
+}

MyNewProjectName.Domain/Exceptions/NotFoundException.cs

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+namespace MyNewProjectName.Domain.Exceptions;
+
+/// <summary>
+/// Exception thrown when an entity is not found
+/// </summary>
+public class NotFoundException : DomainException
+{
+    public NotFoundException()
+        : base()
+    {
+    }
+
+    public NotFoundException(string message)
+        : base(message)
+    {
+    }
+
+    public NotFoundException(string message, Exception innerException)
+        : base(message, innerException)
+    {
+    }
+
+    public NotFoundException(string name, object key)
+        : base($"Entity \"{name}\" ({key}) was not found.")
+    {
+    }
+}

MyNewProjectName.Domain/Exceptions/ValidationException.cs

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+namespace MyNewProjectName.Domain.Exceptions;
+
+/// <summary>
+/// Exception thrown when validation fails
+/// </summary>
+public class ValidationException : DomainException
+{
+    public IDictionary<string, string[]> Errors { get; }
+
+    public ValidationException()
+        : base("One or more validation failures have occurred.")
+    {
+        Errors = new Dictionary<string, string[]>();
+    }
+
+    public ValidationException(string message)
+        : base(message)
+    {
+        Errors = new Dictionary<string, string[]>();
+    }
+
+    public ValidationException(IDictionary<string, string[]> errors)
+        : base("One or more validation failures have occurred.")
+    {
+        Errors = errors;
+    }
+}