Split online.cs and offline.csFile (#941)

Co-authored-by: 东风破 <birdfishs@163.com>

scripts/dotnet/OnlineModelConfig.cs

@@ -0,0 +1,49 @@
+/// Copyright (c)  2023  Xiaomi Corporation (authors: Fangjun Kuang)
+/// Copyright (c)  2023 by manyeyes
+/// Copyright (c)  2024.5 by 东风破
+
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System;
+
+namespace SherpaOnnx
+{
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct OnlineModelConfig
+    {
+        public OnlineModelConfig()
+        {
+            Transducer = new OnlineTransducerModelConfig();
+            Paraformer = new OnlineParaformerModelConfig();
+            Zipformer2Ctc = new OnlineZipformer2CtcModelConfig();
+            Tokens = "";
+            NumThreads = 1;
+            Provider = "cpu";
+            Debug = 0;
+            ModelType = "";
+        }
+
+        public OnlineTransducerModelConfig Transducer;
+        public OnlineParaformerModelConfig Paraformer;
+        public OnlineZipformer2CtcModelConfig Zipformer2Ctc;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string Tokens;
+
+        /// Number of threads used to run the neural network model
+        public int NumThreads;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string Provider;
+
+        /// true to print debug information of the model
+        public int Debug;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string ModelType;
+    }
+
+}