fix:issue #330

Ink Canvas/MainWindow_cs/MW_Settings.cs

@@ -298,9 +298,11 @@ namespace Ink_Canvas
             }
         }
 
-        private static readonly HttpClient HitokotoHttpClient = CreateHitokotoClient();
+        private static readonly Lazy<object> HitokotoHttpClient = new Lazy<object>(CreateHitokotoClient, System.Threading.LazyThreadSafetyMode.ExecutionAndPublication);
 
-        private static HttpClient CreateHitokotoClient()
+        private static object CreateHitokotoClient()
+        {
+            try
             {
                 var client = new HttpClient
                 {
@@ -315,6 +317,18 @@ namespace Ink_Canvas
                 }
                 return client;
             }
+            catch (Exception ex)
+            {
+                try
+                {
+                    LogHelper.WriteLogToFile($"无法创建 HttpClient (System.Net.Http 可能缺失): {ex.Message}", LogHelper.LogType.Warning);
+                }
+                catch
+                {
+                }
+                return null;
+            }
+        }
 
         private async Task UpdateChickenSoupTextAsync()
         {
@@ -346,7 +360,14 @@ namespace Ink_Canvas
 
                     try
                     {
-                        var response = await HitokotoHttpClient.GetAsync("https://v1.hitokoto.cn/?encode=text");
+                        var clientObj = HitokotoHttpClient.Value;
+                        if (clientObj == null || !(clientObj is HttpClient client))
+                        {
+                            BlackBoardWaterMark.Text = "一言功能不可用（缺少 System.Net.Http）";
+                            return;
+                        }
+
+                        var response = await client.GetAsync("https://v1.hitokoto.cn/?encode=text");
                         response.EnsureSuccessStatusCode();
 
                         var text = await response.Content.ReadAsStringAsync();