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>
@@ -47,36 +47,81 @@ 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)");
 
-            // 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}";
-            var response = await _httpClient.GetFromJsonAsync<List<TiingoDailyResponse>>(url);
+            // 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 (response == null || response.Count == 0)
+            if (string.IsNullOrEmpty(response) || !response.Contains("~"))
             {
-                throw new Exception($"No data found for {symbol}");
+                throw new Exception($"腾讯财经接口返回无效数据，标的: {symbol}");
             }
 
-            var latest = response[^1];
-            decimal? prevClose = response.Count >= 2 ? response[^2].close : null;
+            // 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 = latest.close ?? 0,
-                PreviousClose = prevClose ?? 0,
-                Timestamp = latest.date ?? DateTime.UtcNow,
+                Price = currentPrice,
+                PreviousClose = prevClose,
+                Timestamp = DateTime.UtcNow,
                 AssetType = "Stock"
             };
         }
         catch (Exception ex)
         {
-            _logger.LogError(ex, $"Error getting stock price for {symbol}");
-            throw;
+            _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 = $"https://api.tiingo.com/tiingo/daily/{symbol}/prices?token={_tiingoApiKey}";
+        var response = await _httpClient.GetFromJsonAsync<List<TiingoDailyResponse>>(url);
+
+        if (response == null || response.Count == 0)
+        {
+            throw new Exception($"No data found for {symbol}");
+        }
+
+        var latest = response[^1];
+        decimal? prevClose = response.Count >= 2 ? response[^2].close : null;
+
+        return new MarketPriceResponse
+        {
+            Symbol = symbol,
+            Price = latest.close ?? 0,
+            PreviousClose = prevClose ?? 0,
+            Timestamp = latest.date ?? DateTime.UtcNow,
+            AssetType = "Stock"
+        };
+    }
+
     /// <summary>
     /// 获取加密货币实时价格
     /// </summary>