添加试运行模式，修改生产环境数据重建规则

MesETL.App/HostedServices/FileInputService.cs

@@ -31,6 +31,8 @@ public class FileInputService : IInputService
     private readonly ProcessContext _context;
     private readonly DataReaderFactory _dataReaderFactory;
     private readonly long _memoryThreshold;
+    private readonly bool _dryRun;
+    private readonly int _dryRunCount;
 
     public FileInputService(ILogger<FileInputService> logger,
             IOptions<DataInputOptions> dataInputOptions,
@@ -45,12 +47,16 @@ public class FileInputService : IInputService
         _producerQueue = producerQueue;
         _dataReaderFactory = dataReaderFactory;
         _memoryThreshold = (long)(configuration.GetValue<double>("MemoryThreshold", 8) * 1024 * 1024 * 1024);
+        _dryRun = configuration.GetValue("DryRun", false);
+        _dryRunCount = configuration.GetValue("DryRunCount", 100_000);
     }
 
     public async Task ExecuteAsync(CancellationToken cancellationToken)
     {
         var inputDir = _dataInputOptions.Value.InputDir ?? throw new ApplicationException("未配置文件输入目录");
         _logger.LogInformation("***** 输入服务已启动，工作目录为：{InputDir} *****", inputDir);
+        if (_dryRun)
+            _logger.LogInformation("***** 试运行模式已开启，只读取前 {Count} 行数据 *****", _dryRunCount);
 
         var orderedInfo = GetOrderedInputInfo(inputDir);
         
@@ -74,6 +80,8 @@ public class FileInputService : IInputService
                 await _producerQueue.EnqueueAsync(record);
                 count++;
                 _context.AddInput();
+                if (_dryRun && count >= _dryRunCount)
+                    break;
             }
 
             _context.AddTableInput(info.TableName, count);
@@ -82,7 +90,7 @@ public class FileInputService : IInputService
         }
 
         _context.CompleteInput();
-        _logger.LogInformation("***** 输入服务已执行完毕 *****");
+        _logger.LogInformation("***** 输入服务{DryRun}已执行完毕 *****", _dryRun ? " (试运行)" : "");
     }
 
     public IEnumerable<FileInputInfo> GetOrderedInputInfo(string dir)

MesETL.App/HostedServices/MainHostedService.cs

@@ -163,9 +163,16 @@ public class MainHostedService : BackgroundService
     private async Task ExportResultAsync()
     {
         var sb = new StringBuilder();
-        if (_context.HasException)
-            sb.AppendLine("# 程序执行完毕，**但中途发生了异常**");
-        else sb.AppendLine("# 程序执行完毕，没有发生错误");
+
+        var title = (_config.GetValue("DryRun", false), _context.HasException) switch
+        {
+            (true, true) => "# 试运行结束，**请注意处理异常**",
+            (true, false) => "# 试运行结束，没有发生异常",
+            (false, true) => "# 程序执行完毕，**但中途发生了异常**",
+            (false, false) => "# 程序执行完毕，没有发生错误"
+        };
+        sb.AppendLine(title);
+          
         sb.AppendLine("## 处理计数");
         var processCount = new[]
         {