示波器修改：visa连接方式+截图保存

UIShare/GlobalVariable/DeviceHealthMonitor.cs

@@ -124,6 +124,11 @@ namespace UIShare.GlobalVariable
                     {
                         alive = await ProbeTcpDeviceAsync(tcpDevice);
                     }
+                    // VISA 设备同理：IsConnected 仅表示会话对象存在，主动探活以检测死会话
+                    else if (alive && device is Visa visaDevice)
+                    {
+                        alive = await ProbeVisaDeviceAsync(visaDevice);
+                    }
 
                     if (alive)
                     {
@@ -176,6 +181,26 @@ namespace UIShare.GlobalVariable
             }
         }
 
+        /// <summary>
+        /// 对 VISA 设备执行轻量级主动探活（SCPI *IDN?）。
+        /// <para>通过 WriteReadAsync 内部获取 _commLock，与监控采样天然串行化；
+        /// 死会话将在 VISA 自身的 IOTimeout 内抛出异常，返回 false 触发重连。</para>
+        /// </summary>
+        /// <returns>true: 探活成功（会话确实存活）; false: 探活失败（死会话）</returns>
+        private async Task<bool> ProbeVisaDeviceAsync(Visa visaDevice)
+        {
+            try
+            {
+                using var probeCts = new CancellationTokenSource(TimeSpan.FromSeconds(2));
+                string resp = await visaDevice.WriteReadAsync("*IDN?\n", "\n", probeCts.Token);
+                return !string.IsNullOrWhiteSpace(resp);
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
         /// <summary>
         /// 重连单个设备。
         /// <para>

UIShare/GlobalVariable/DeviceManager.cs

@@ -68,6 +68,12 @@ namespace UIShare.GlobalVariable
                 return $"Tcp:{config.TcpConfig.IPAddress}:{config.TcpConfig.Port}";
             }
 
+            if (string.Equals(config.ConnectionType, "Visa", StringComparison.OrdinalIgnoreCase)
+                && config.VisaConfig != null)
+            {
+                return $"Visa:{config.VisaConfig.ResourceName}";
+            }
+
             if (string.Equals(config.ConnectionType, "Serial", StringComparison.OrdinalIgnoreCase)
                 && config.SerialPortConfig != null)
             {
@@ -129,6 +135,7 @@ namespace UIShare.GlobalVariable
                         return config.ConnectionType switch
                         {
                             "Tcp" => CreateTcpDevice(deviceType, config.TcpConfig)!,
+                            "Visa" => CreateVisaDevice(deviceType, config.VisaConfig)!,
                             "Serial" => CreateSerialDevice(deviceType, config.SerialPortConfig)!,
                             _ => null!
                         };
@@ -379,6 +386,7 @@ namespace UIShare.GlobalVariable
                 bool ok = conn switch
                 {
                     "Tcp" => await ConnectTcpAsync(name, device, ct),
+                    "Visa" => await ConnectVisaAsync(name, device, ct),
                     "Serial" => await ConnectSerialAsync(name, device, ct),
                     _ => false
                 };
@@ -417,6 +425,16 @@ namespace UIShare.GlobalVariable
             return false;
         }
 
+        private static async Task<bool> ConnectVisaAsync(string name, IBaseInterface device, CancellationToken ct)
+        {
+            if (device is IVisa visa)
+            {
+                return await visa.ConnectAsync(ct);
+            }
+            LoggerHelper.Warn($"设备 [{name}] 配置为 Visa 但未实现 IVisa，实际类型为 {device.GetType().Name}。");
+            return false;
+        }
+
         private static async Task<bool> ConnectSerialAsync(string name, IBaseInterface device, CancellationToken ct)
         {
             if (device is not ISerialPort sp)
@@ -533,7 +551,34 @@ namespace UIShare.GlobalVariable
                 SendTimeout = vm.SendTimeout,
                 ReceiveTimeout = vm.ReceiveTimeout
             };
-            return Activator.CreateInstance(type, cfg) as IBaseInterface;
+            try
+            {
+                return Activator.CreateInstance(type, cfg) as IBaseInterface;
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.Warn($"实例化 Tcp 设备 [{type.Name}] 失败（连接配置与设备构造函数不匹配？）：{ex.InnerException?.Message ?? ex.Message}");
+                return null;
+            }
+        }
+        private static IBaseInterface? CreateVisaDevice(Type type, VisaConfigVM? vm)
+        {
+            vm ??= new VisaConfigVM();
+            var cfg = new VisaConfig
+            {
+                ResourceName = vm.ResourceName,
+                OpenTimeout = vm.OpenTimeout,
+                IOTimeout = vm.IOTimeout
+            };
+            try
+            {
+                return Activator.CreateInstance(type, cfg) as IBaseInterface;
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.Warn($"实例化 Visa 设备 [{type.Name}] 失败（连接配置与设备构造函数不匹配？）：{ex.InnerException?.Message ?? ex.Message}");
+                return null;
+            }
         }
         private static IBaseInterface? CreateSerialDevice(Type type, SerialPortConfigVM? vm)
         {
@@ -548,7 +593,15 @@ namespace UIShare.GlobalVariable
                 ReadTimeout = vm.ReadTimeout,
                 WriteTimeout = vm.WriteTimeout
             };
-            return Activator.CreateInstance(type, cfg) as IBaseInterface;
+            try
+            {
+                return Activator.CreateInstance(type, cfg) as IBaseInterface;
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.Warn($"实例化 Serial 设备 [{type.Name}] 失败（连接配置与设备构造函数不匹配？）：{ex.InnerException?.Message ?? ex.Message}");
+                return null;
+            }
         }
 
         public void Dispose()