Merge pull request #459 from hchen2020/master

Fix llm selection bug.

Author: Oceania2018

src/Infrastructure/BotSharp.Abstraction/MLTasks/ILlmProviderService.cs

@@ -6,6 +6,6 @@ public interface ILlmProviderService
 {
     LlmModelSetting GetSetting(string provider, string model);
     List<string> GetProviders();
-    LlmModelSetting GetProviderModel(string provider, string id, bool multiModal = false);
+    LlmModelSetting GetProviderModel(string provider, string id, bool? multiModal = null);
     List<LlmModelSetting> GetProviderModels(string provider);
 }

src/Infrastructure/BotSharp.Core/Infrastructures/CompletionProvider.cs

@@ -36,7 +36,7 @@ public static IChatCompletion GetChatCompletion(IServiceProvider services,
         string? provider = null, 
         string? model = null,
         string? modelId = null,
-        bool multiModal = false,
+        bool? multiModal = null,
         AgentLlmConfig? agentConfig = null)
     {
         var completions = services.GetServices<IChatCompletion>();
@@ -59,7 +59,7 @@ private static (string, string) GetProviderAndModel(IServiceProvider services,
         string? provider = null,
         string? model = null,
         string? modelId = null,
-        bool multiModal = false,
+        bool? multiModal = null,
         AgentLlmConfig? agentConfig = null)
     {
         var agentSetting = services.GetRequiredService<AgentSettings>();
@@ -82,7 +82,7 @@ private static (string, string) GetProviderAndModel(IServiceProvider services,
             {
                 var modelIdentity = state.ContainsState("model_id") ? state.GetState("model_id") : modelId;
                 var llmProviderService = services.GetRequiredService<ILlmProviderService>();
-                model = llmProviderService.GetProviderModel(provider, modelIdentity, multiModal)?.Name;
+                model = llmProviderService.GetProviderModel(provider, modelIdentity, multiModal: multiModal)?.Name;
             }
         }
 

src/Infrastructure/BotSharp.Core/Infrastructures/LlmProviderService.cs

@@ -44,11 +44,15 @@ public List<LlmModelSetting> GetProviderModels(string provider)
             ?.Models ?? new List<LlmModelSetting>();
     }
 
-    public LlmModelSetting GetProviderModel(string provider, string id, bool multiModal = false)
+    public LlmModelSetting GetProviderModel(string provider, string id, bool? multiModal = null)
     {
         var models = GetProviderModels(provider)
-            .Where(x => x.Id == id && x.MultiModal == multiModal)
-            .ToList();
+            .Where(x => x.Id == id);
+
+        if (multiModal.HasValue)
+        {
+            models = models.Where(x => x.MultiModal == multiModal);
+        }
 
         var random = new Random();
         var index = random.Next(0, models.Count());