chore: 将 json 序列化工具提出来

Common/Common/Json/LCJsonConverter.cs

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+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+namespace LeanCloud.Common {
+    public class LCJsonConverter : JsonConverter {
+        public override bool CanConvert(Type objectType) {
+            return objectType == typeof(object);
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) {
+            serializer.Serialize(writer, value);
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) {
+            if (reader.TokenType == JsonToken.StartObject) {
+                var obj = new Dictionary<string, object>();
+                serializer.Populate(reader, obj);
+                return obj;
+            }
+            if (reader.TokenType == JsonToken.StartArray) {
+                var arr = new List<object>();
+                serializer.Populate(reader, arr);
+                return arr;
+            }
+            if (reader.TokenType == JsonToken.Integer) {
+                if ((long)reader.Value < int.MaxValue) {
+                    return Convert.ToInt32(reader.Value);
+                }
+            }
+
+            return serializer.Deserialize(reader);
+        }
+
+        public readonly static LCJsonConverter Default = new LCJsonConverter();
+    }
+}

LiveQuery/LiveQuery/Internal/LCLiveQueryHeartBeat.cs

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+using System;
+namespace LiveQuery.Internal {
+    public class LCLiveQueryHeartBeat {
+        public LCLiveQueryHeartBeat() {
+        }
+    }
+}

LiveQuery/LiveQuery/LCQueryExtension.cs

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+using System;
+namespace LiveQuery {
+    public class LCQueryExtension {
+        public LCQueryExtension() {
+        }
+    }
+}

Sample/LiveQueryApp/LiveQueryApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Sample/LiveQueryApp/Program.cs

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+using System;
+
+namespace LiveQueryApp {
+    class Program {
+        static void Main(string[] args) {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}

Sample/LiveQueryApp/SingleThreadSynchronizationContext.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+
+namespace RealtimeApp {
+    /// <summary>
+    /// 单线程环境，用于控制台应用 await 返回
+    /// </summary>
+    public class SingleThreadSynchronizationContext : SynchronizationContext {
+        private readonly BlockingCollection<KeyValuePair<SendOrPostCallback, object>> queue = new BlockingCollection<KeyValuePair<SendOrPostCallback, object>>();
+
+        public override void Post(SendOrPostCallback d, object state) {
+            queue.Add(new KeyValuePair<SendOrPostCallback, object>(d, state));
+        }
+
+        public void RunOnCurrentThread() {
+            while (queue.TryTake(out KeyValuePair<SendOrPostCallback, object> workItem, Timeout.Infinite)) {
+                workItem.Key(workItem.Value);
+            }
+        }
+
+        public void Complete() {
+            queue.CompleteAdding();
+        }
+
+        public static void Run(Func<Task> func) {
+            SynchronizationContext prevContext = Current;
+            try {
+                SingleThreadSynchronizationContext syncContext = new SingleThreadSynchronizationContext();
+                SetSynchronizationContext(syncContext);
+
+                Task t = func();
+                syncContext.RunOnCurrentThread();
+
+                t.GetAwaiter().GetResult();
+            } finally {
+                SetSynchronizationContext(prevContext);
+            }
+        }
+    }
+}