正价JsonTypeAttribute特性，标记该特性的数据会已json格式存储在数据库中。

Falcon.SugarApi/DatabaseDefinitions/EntityServices/JsonTypeColumnServices.cs

@@ -0,0 +1,21 @@
+using SqlSugar;
+using System.Reflection;
+
+namespace Falcon.SugarApi.DatabaseDefinitions.EntityServices
+{
+    /// <summary>
+    /// 设置列以Json类型存储。
+    /// </summary>
+    public class JsonTypeColumnServices:IEntityColumnServices
+    {
+        /// <inheritdoc/>
+        public void SetupColumn(PropertyInfo p,EntityColumnInfo c) {
+            if(p.TryGetAttribute<JsonTypeAttribute>(out var a)) {
+                c.IsJson = true;
+                if(a.Length >= 0) {
+                    c.Length = a.Length;
+                }
+            }
+        }
+    }
+}

Falcon.SugarApi/DatabaseDefinitions/JsonTypeAttribute.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace Falcon.SugarApi.DatabaseDefinitions
+{
+    /// <summary>
+    /// 表示该列将以json字符串形式存储
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Property,AllowMultiple = false,Inherited = false)]
+    public class JsonTypeAttribute:Attribute
+    {
+        /// <summary>
+        /// 数据长度。默认4000
+        /// </summary>
+        public int Length { get; set; } = 4000;
+    }
+}

Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs

@@ -35,6 +35,7 @@ namespace Falcon.SugarApi.DatabaseDefinitions
             ColumnServices.Add(new SetupKeyColumnServices());
             ColumnServices.Add(new SetupLengthColumnServices());
             ColumnServices.Add(new SetupNullableColumnServices());
+            ColumnServices.Add(new JsonTypeColumnServices());
         }
 
         /// <summary>