From 0d02927ba67903ee91f0c77d89ff49f1da021367 Mon Sep 17 00:00:00 2001
From: Oli Sturm <oliver+commitsigning@oliversturm.com>
Date: Mon, 27 Apr 2026 23:42:31 +0100
Subject: [PATCH] improve output

---
 csharp-es/Domain/Account.cs  |  6 ++++--
 csharp-es/Library/Logging.cs | 16 +---------------
 csharp-es/Program.cs         | 21 +++++++++++++--------
 csharp-es/csharp-es.csproj   |  3 +++
 4 files changed, 21 insertions(+), 25 deletions(-)

diff --git a/csharp-es/Domain/Account.cs b/csharp-es/Domain/Account.cs
index 4a744d7..459fe93 100644
--- a/csharp-es/Domain/Account.cs
+++ b/csharp-es/Domain/Account.cs
@@ -11,6 +11,8 @@ public abstract record AccountCommand
     public sealed record WithdrawMoney(Guid AccountId, Money Amount) : AccountCommand;
 
     public sealed record DepositMoney(Guid AccountId, Money Amount) : AccountCommand;
+
+    public sealed record UnhandledTestCommand() : AccountCommand;
 }
 
 public abstract record AccountEvent(Guid AccountId)
@@ -31,7 +33,7 @@ public abstract record AccountError
 
     public sealed record OpeningBalanceMustBeNonNegative : AccountError;
 
-    public sealed record InnerException(Exception exception) : AccountError;
+    public sealed record InnerException(string Message) : AccountError;
 }
 
 public static class AccountDecider
@@ -75,7 +77,7 @@ public static class AccountDecider
 
                     _ => throw new InvalidOperationException("Unknown command."),
                 },
-            e => new AccountError.InnerException(e)
+            e => new AccountError.InnerException(e.Message)
         );
 
     public static Result<AccountState?, AccountError> Evolve(
diff --git a/csharp-es/Library/Logging.cs b/csharp-es/Library/Logging.cs
index ce58f5f..a3d8af2 100644
--- a/csharp-es/Library/Logging.cs
+++ b/csharp-es/Library/Logging.cs
@@ -1,6 +1,3 @@
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
 namespace CsharpEs.Library;
 
 public static class Logging
@@ -23,18 +20,7 @@ public static class Logging
     }
 
     public static string Format(Object? o) =>
-        o != null
-            ? Indent(
-                JsonSerializer.Serialize(
-                    o,
-                    new JsonSerializerOptions
-                    {
-                        WriteIndented = true,
-                        Converters = { new JsonStringEnumConverter() },
-                    }
-                )
-            )
-            : "(null)";
+        Indent(ObjectDumper.Dump(o, new DumpOptions() { DumpStyle = DumpStyle.CSharp }));
 
     public static void Output(string src, string message, Object? x)
     {
diff --git a/csharp-es/Program.cs b/csharp-es/Program.cs
index 83132dd..c8e2436 100644
--- a/csharp-es/Program.cs
+++ b/csharp-es/Program.cs
@@ -19,10 +19,13 @@ public class Program
     {
         accountId = Guid.NewGuid();
         demoCommands = demoCommands.AddRange([
-            new AccountCommand.OpenAccount(accountId, new Money(-200m)),
-            //            new AccountCommand.OpenAccount(accountId, new Money(200m)),
+            // bring this in to see an error right from the start
+            // new AccountCommand.OpenAccount(accountId, new Money(-200m)),
+            new AccountCommand.OpenAccount(accountId, new Money(200m)),
             new AccountCommand.WithdrawMoney(accountId, new Money(100m)),
             new AccountCommand.WithdrawMoney(accountId, new Money(200m)),
+            // or maybe an exception in between?
+            // new AccountCommand.UnhandledTestCommand(),
             new AccountCommand.DepositMoney(accountId, new Money(500m)),
         ]);
     }
@@ -65,12 +68,14 @@ public class Program
                     .Aggregate(
                         Result<AccountState?, DemoError>.Ok(null),
                         (stateResult, command) =>
-                            stateResult.Bind(state =>
-                                AccountDecider
-                                    .Decide(state, command)
-                                    .MapError(e => (DemoError)new DemoError.Account(e))
-                                    .Bind(@event => ApplyEvent(readModel, state, @event))
-                            )
+                            stateResult
+                                .Bind(state =>
+                                    AccountDecider
+                                        .Decide(state, command)
+                                        .MapError(e => (DemoError)new DemoError.Account(e))
+                                        .Bind(@event => ApplyEvent(readModel, state, @event))
+                                )
+                                .Log("loop", "Intermediate state")
                     )
                     .Bind(s =>
                         readModel
diff --git a/csharp-es/csharp-es.csproj b/csharp-es/csharp-es.csproj
index a955afb..c4402e9 100644
--- a/csharp-es/csharp-es.csproj
+++ b/csharp-es/csharp-es.csproj
@@ -6,4 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="ObjectDumper.NET" Version="4.3.2" />
+  </ItemGroup>
 </Project>