diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/MethodCallExpressionTractor.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/MethodCallExpressionTractor.cs
index 3efa90328..2a417b007 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/MethodCallExpressionTractor.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/MethodCallExpressionTractor.cs
@@ -260,7 +260,8 @@ namespace SqlSugar.MongoDb
                 name = "ToDate";
             if (name == "Contains" && methodCallExpression.Arguments.Count == 1
                 && methodCallExpression?.Object?.Type != null 
-                && typeof(IEnumerable).IsAssignableFrom(methodCallExpression.Object.Type))
+                && typeof(IEnumerable).IsAssignableFrom(methodCallExpression.Object.Type)
+                && methodCallExpression.Object.Type!=UtilConstants.StringType)
             {
                 name = "ContainsArray";
             }
diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
index bd9fd4381..7dc5f023b 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
@@ -736,6 +736,16 @@ namespace SqlSugar.MongoDb
                 var inDoc = new BsonDocument(name, new BsonDocument("$in", bsonArray));
                 return inDoc.ToJson(UtilMethods.GetJsonWriterSettings());
             }
+            else if (ExpressionTool.GetParameters(itemExp).Count == 0)
+            {
+                // itemExp 是常量表达式，arrayExp 是字段表达式
+                var value =UtilMethods.MyCreate(ExpressionTool.DynamicInvoke(itemExp));
+                BsonValue arrayField = new ExpressionVisitor(context).Visit(arrayExp);
+ 
+                // 构建 MongoDB $in 查询表达式，判断 value 是否在 arrayField 字段数组中
+                var inDoc = new BsonDocument(arrayField.ToString(), new BsonDocument(  "$in",new BsonArray() { value } ));
+                return inDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+            }
             else
             {
                 // 数组表达式不是常量，需生成MongoDB $in表达式，数组字段为arrayExp，判断itemExp是否在数组中
@@ -744,7 +754,7 @@ namespace SqlSugar.MongoDb
                 // 获取数组字段名
                 BsonValue arrayField = new ExpressionVisitor(context).Visit(arrayExp);
                 // 构建MongoDB的 $in 查询表达式，格式为 { "$in": [ "$_id", "$$let_RoleIds" ] }
-                var inArray = new BsonArray {  name, arrayField };
+                var inArray = new BsonArray { name, arrayField };
                 var inDoc = new BsonDocument("$in", inArray);
                 return inDoc.ToJson(UtilMethods.GetJsonWriterSettings());
             }
diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbQueryBuilder.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbQueryBuilder.cs
index 95a60f172..b3cd74955 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbQueryBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbQueryBuilder.cs
@@ -308,7 +308,7 @@ namespace SqlSugar.MongoDb
 
                 // $unwind
                 BsonValue unwindDoc = null;
-                if (item.JoinType == JoinType.Left&&isEasyJoin)
+                if (item.JoinType == JoinType.Left)
                 {
                     unwindDoc = new BsonDocument("$unwind", new BsonDocument
                     {