修改Lambda表达式的实现

Server/Hotfix/Module/DB/DBProxyComponentSystem.cs

@@ -4,6 +4,10 @@ using System.Linq.Expressions;
 using System.Threading;
 using System.Threading.Tasks;
 using ETModel;
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization;
+using MongoDB.Bson.Serialization.Serializers;
+using MongoDB.Driver;
 
 namespace ETHotfix
 {
@@ -57,6 +61,22 @@ namespace ETHotfix
 			DBQueryResponse dbQueryResponse = (DBQueryResponse)await session.Call(new DBQueryRequest { CollectionName = typeof(T).Name, Id = id, NeedCache = needCache });
 			return (T)dbQueryResponse.Component;
 		}
+		
+		public static async Task<List<T>> Query<T>(this DBProxyComponent self, Expression<Func<T ,bool>> exp, bool needCache = true) where T: ComponentWithId
+		{
+			List<T> list = new List<T>();
+			Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
+			ExpressionFilterDefinition<T> filter = new ExpressionFilterDefinition<T>(exp);
+			IBsonSerializerRegistry serializerRegistry = BsonSerializer.SerializerRegistry;
+			IBsonSerializer<T> documentSerializer = serializerRegistry.GetSerializer<T>();
+			string json = filter.Render(documentSerializer, serializerRegistry).ToJson();
+			DBQueryJsonResponse dbQueryResponse = (DBQueryJsonResponse)await session.Call(new DBQueryJsonRequest { CollectionName = typeof(T).Name, Json = json });
+			foreach (ComponentWithId component in dbQueryResponse.Components)
+			{
+				list.Add((T)component);
+			}
+			return list;
+		}
 
 		public static async Task<List<T>> QueryBatch<T>(this DBProxyComponent self, List<long> ids, bool needCache = true) where T : ComponentWithId
 		{
@@ -69,12 +89,6 @@ namespace ETHotfix
 			}
 			return list;
 		}
-		
-		public static async Task<List<T>> Query<T>(this DBProxyComponent self, Expression<Func<T, bool>> func) where T : ComponentWithId
-		{
-			ExpressionVistor vistor = new ExpressionVistor(func);
-			return await self.QueryJson<T>(vistor.Output);
-		}
 
 		public static async Task<List<T>> QueryJson<T>(this DBProxyComponent self, string json) where T : ComponentWithId
 		{

Server/Model/Module/DB/ExpressionVistor.cs

-using System;
-using System.Linq.Expressions;
-using System.Reflection;
-using System.Text;
-
-namespace ETModel
-{
-    public sealed class ExpressionVistor: ExpressionVisitor
-    {
-        private readonly StringBuilder Builder = new StringBuilder("{");
-
-        public string Output
-        {
-            get
-            {
-                return this.Builder.ToString();
-            }
-        }
-
-        private string Variable;
-        private ExpressionType NodeType;
-
-        public ExpressionVistor(Expression node)
-        {
-            Visit(node);
-        }
-
-        protected override Expression VisitLambda<T>(Expression<T> node)
-        {
-            Expression lambda = base.VisitLambda(node);
-            this.Builder.Remove(this.Builder.Length - 1, 1); //Remove the Last Comma
-            this.Builder.Append("}");
-            return lambda;
-        }
-
-        protected override Expression VisitBinary(BinaryExpression node)
-        {
-            this.NodeType = node.NodeType;
-            return base.VisitBinary(node);
-        }
-
-        protected override Expression VisitMember(MemberExpression node)
-        {
-            switch (node.Expression.NodeType)
-            {
-                case ExpressionType.Constant:
-                case ExpressionType.MemberAccess:
-                {
-                    ConstantExpression cleanNode = GetMemberConstant(node);
-                    return VisitConstant(cleanNode);
-                }
-            }
-
-            if (node.Member.Name != nameof(ComponentWithId.Id))
-            {
-                this.Variable = node.Member.Name;
-            }
-            else
-            {
-                this.Variable = "_id";
-            }
-
-            return base.VisitMember(node);
-        }
-
-        private static ConstantExpression GetMemberConstant(MemberExpression node)
-        {
-            object value;
-            switch (node.Member.MemberType)
-            {
-                case MemberTypes.Field:
-                    value = GetFieldValue(node);
-                    break;
-                case MemberTypes.Property:
-                    value = GetPropertyValue(node);
-                    break;
-                default:
-                    throw new NotSupportedException();
-            }
-            return Expression.Constant(value, node.Type);
-        }
-        
-        protected override Expression VisitConstant(ConstantExpression node)
-        {
-            this.Builder.Append(this.Variable);
-            bool flag = false;
-            switch (this.NodeType)
-            {
-                case ExpressionType.Equal:
-                    this.Builder.Append(":");
-                    break;
-                case ExpressionType.GreaterThan:
-                    this.Builder.Append(":{");
-                    this.Builder.Append("$gt:");
-                    flag = true;
-                    break;
-                case ExpressionType.GreaterThanOrEqual:
-                    this.Builder.Append(":{");
-                    this.Builder.Append("$gte:");
-                    flag = true;
-                    break;
-                case ExpressionType.LessThan:
-                    this.Builder.Append(":{");
-                    this.Builder.Append("$lt:");
-                    flag = true;
-                    break;
-                case ExpressionType.LessThanOrEqual:
-                    this.Builder.Append(":{");
-                    this.Builder.Append("lte:");
-                    flag = true;
-                    break;
-            }
-
-            this.Builder.Append(node.Value);
-            if (flag)
-            {
-                this.Builder.Append("}");
-            }
-
-            this.Builder.Append(",");
-            return base.VisitConstant(node);
-        }
-        
-        private static object GetFieldValue(MemberExpression node)
-        {
-            FieldInfo fieldInfo = (FieldInfo)node.Member;
-
-            object instance = node.Expression == null ? null : TryEvaluate(node.Expression).Value;
-
-            return fieldInfo.GetValue(instance);
-        }
-
-        private static object GetPropertyValue(MemberExpression node)
-        {
-            PropertyInfo propertyInfo = (PropertyInfo)node.Member;
-
-            object instance = node.Expression == null ? null : TryEvaluate(node.Expression).Value;
-
-            return propertyInfo.GetValue(instance, null);
-        }
-        
-        private static ConstantExpression TryEvaluate(Expression expression)
-        {
-            if (expression.NodeType != ExpressionType.Constant)
-            {
-                throw new NotSupportedException();
-            }
-
-            return (ConstantExpression)expression;
-        }
-    }
-}
\ No newline at end of file