替换股票行情接口为腾讯财经：免费无限制，支持盘前盘后实时价格，自动降级Tiingo

AssetManager.Infrastructure/Services/MarketDataService.cs

@@ -39,7 +39,7 @@ public class MarketDataService : IMarketDataService
     }
 
     /// <summary>
-    /// 获取股票实时价格
+    /// 获取股票实时价格（使用腾讯财经接口，免费无限制，支持盘前盘后）
     /// </summary>
     /// <param name="symbol">股票代码</param>
     /// <returns>股票价格信息</returns>
@@ -47,7 +47,58 @@ public class MarketDataService : IMarketDataService
     {
         try
         {
-            _logger.LogInformation($"Requesting stock price for symbol: {symbol}");
+            _logger.LogInformation($"Requesting stock price for symbol: {symbol} (腾讯财经接口)");
+
+            // 腾讯财经美股接口：前缀us，小写代码
+            var url = $"http://qt.gtimg.cn/q=us{symbol.ToLower()}";
+            var response = await _httpClient.GetStringAsync(url);
+
+            if (string.IsNullOrEmpty(response) || !response.Contains("~"))
+            {
+                throw new Exception($"腾讯财经接口返回无效数据，标的: {symbol}");
+            }
+
+            // 解析返回数据
+            var parts = response.Split('"')[1].Split('~');
+            if (parts.Length < 36)
+            {
+                throw new Exception($"腾讯财经返回字段不足，标的: {symbol}");
+            }
+
+            // 提取字段：[3]=最新价 [4]=昨收价
+            if (!decimal.TryParse(parts[3], out var currentPrice) || currentPrice <= 0)
+            {
+                throw new Exception($"解析最新价失败，标的: {symbol}，返回值: {parts[3]}");
+            }
+
+            if (!decimal.TryParse(parts[4], out var prevClose) || prevClose <= 0)
+            {
+                prevClose = currentPrice; // 解析失败用当前价当昨收
+            }
+
+            return new MarketPriceResponse
+            {
+                Symbol = symbol,
+                Price = currentPrice,
+                PreviousClose = prevClose,
+                Timestamp = DateTime.UtcNow,
+                AssetType = "Stock"
+            };
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, $"腾讯财经接口获取价格失败，标的: {symbol}，降级使用Tiingo接口");
+            // 降级使用Tiingo接口
+            return await GetStockPriceFromTiingoAsync(symbol);
+        }
+    }
+
+    /// <summary>
+    /// 从Tiingo获取股票价格（降级用）
+    /// </summary>
+    private async Task<MarketPriceResponse> GetStockPriceFromTiingoAsync(string symbol)
+    {
+        _logger.LogInformation($"Requesting stock price for symbol: {symbol} (Tiingo接口)");
 
         // Tiingo 日线最新价格端点（取最近1条）
         var url = $"https://api.tiingo.com/tiingo/daily/{symbol}/prices?token={_tiingoApiKey}";
@@ -70,12 +121,6 @@ public class MarketDataService : IMarketDataService
             AssetType = "Stock"
         };
     }
-        catch (Exception ex)
-        {
-            _logger.LogError(ex, $"Error getting stock price for {symbol}");
-            throw;
-        }
-    }
 
     /// <summary>
     /// 获取加密货币实时价格