refactor : 重构网络下载模块

Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestAssetBundleDownloader.cs

@@ -75,6 +75,9 @@ namespace YooAsset
             }
             else
             {
+                if (string.IsNullOrEmpty(_args.FileHash))
+                    throw new YooInternalException("File hash is null or empty !");
+
                 // 使用 Unity 缓存
                 // 说明：The file hash defining the version of the asset bundle.
                 Hash128 fileHash = Hash128.Parse(_args.FileHash);

Assets/YooAsset/Runtime/DownloadSystem/DownloadSystemHelper.cs

@@ -57,7 +57,7 @@ namespace YooAsset
 #elif UNITY_STANDALONE_LINUX
             url = StringUtility.Format("file:///root/{0}", path);
 #else
-            throw new System.NotImplementedException();
+            throw new System.NotSupportedException($"[{nameof(DownloadSystemHelper.ConvertToWWWPath)}] not implemented platform: {UnityEngine.Application.platform}");
 #endif
 
             // For some special cases when users have special characters in their devices, url paths can not be identified correctly.
@@ -82,4 +82,4 @@ namespace YooAsset
             return false;
         }
     }
-}
+}

Assets/YooAsset/Runtime/DownloadSystem/README.md

@@ -530,9 +530,8 @@ VirtualFileDownloader (独立实现) ──► IDownloadFileRequest
 
 提供跨平台的工具函数：
 
-| 成员 | 说明 |
+| 方法 | 说明 |
 |------|------|
-| `UnityWebRequestCreater` | 兼容保留的全局 UnityWebRequest 创建委托（默认文件系统不再读取，推荐改为 FileSystemParameters 注入） |
 | `ConvertToWWWPath()` | 转换本地路径为 WWW 协议 URL |
 | `IsRequestLocalFile()` | 判断是否本地文件请求 |
 

Assets/YooAsset/Runtime/DownloadSystem/WebRequestCounter.cs

@@ -41,9 +41,9 @@ namespace YooAsset
         public static int GetRequestFailedCount(string packageName, string eventName)
         {
             string key = $"{packageName}_{eventName}";
-            if (_requestFailedRecorder.ContainsKey(key) == false)
-                _requestFailedRecorder.Add(key, 0);
-            return _requestFailedRecorder[key];
+            if (_requestFailedRecorder.TryGetValue(key, out int count))
+                return count;
+            return 0;
         }
     }
 }