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

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

scripts/dotnet/OnlineRecognizerConfig.cs

@@ -0,0 +1,70 @@
+/// 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 OnlineRecognizerConfig
+    {
+        public OnlineRecognizerConfig()
+        {
+            FeatConfig = new FeatureConfig();
+            ModelConfig = new OnlineModelConfig();
+            DecodingMethod = "greedy_search";
+            MaxActivePaths = 4;
+            EnableEndpoint = 0;
+            Rule1MinTrailingSilence = 1.2F;
+            Rule2MinTrailingSilence = 2.4F;
+            Rule3MinUtteranceLength = 20.0F;
+            HotwordsFile = "";
+            HotwordsScore = 1.5F;
+            CtcFstDecoderConfig = new OnlineCtcFstDecoderConfig();
+        }
+        public FeatureConfig FeatConfig;
+        public OnlineModelConfig ModelConfig;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string DecodingMethod;
+
+        /// Used only when decoding_method is modified_beam_search
+        /// Example value: 4
+        public int MaxActivePaths;
+
+        /// 0 to disable endpoint detection.
+        /// A non-zero value to enable endpoint detection.
+        public int EnableEndpoint;
+
+        /// An endpoint is detected if trailing silence in seconds is larger than
+        /// this value even if nothing has been decoded.
+        /// Used only when enable_endpoint is not 0.
+        public float Rule1MinTrailingSilence;
+
+        /// An endpoint is detected if trailing silence in seconds is larger than
+        /// this value after something that is not blank has been decoded.
+        /// Used only when enable_endpoint is not 0.
+        public float Rule2MinTrailingSilence;
+
+        /// An endpoint is detected if the utterance in seconds is larger than
+        /// this value.
+        /// Used only when enable_endpoint is not 0.
+        public float Rule3MinUtteranceLength;
+
+        /// Path to the hotwords.
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string HotwordsFile;
+
+        /// Bonus score for each token in hotwords.
+        public float HotwordsScore;
+
+        public OnlineCtcFstDecoderConfig CtcFstDecoderConfig;
+    }
+
+}