Add SqlFunc.SplitIn(+3)

Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs

@@ -770,6 +770,12 @@ namespace SqlSugar
             var value1 = MergeString(value, "','");
             var value2 = MergeString("','", value);
             var value3 = MergeString("','", value, "','");
+            if (model.Args.Count == 3)
+            {
+                value1 = value1.Replace("','", model.Args[2].MemberName+"" );
+                value2 = value2.Replace("','", model.Args[2].MemberName + "" );
+                value3 = value3.Replace("','", model.Args[2].MemberName + "" );
+            }
             var likeString1 = 
                 StartsWith(new MethodCallExpressionModel() { Args = new List<MethodCallExpressionArgs>() { 
                  new MethodCallExpressionArgs(){ IsMember=true, MemberName=fullString },

Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs

@@ -344,6 +344,11 @@ namespace SqlSugar
             throw new NotSupportedException("Can only be used in expressions");
         }
 
+        public static bool SplitIn(string CommaSegmentationString, string inValue,char splitChar)
+        {
+            throw new NotSupportedException("Can only be used in expressions");
+        }
+
         public static bool ListAny<T>(List<T> listConstant, Expression<Func<T,bool>> expression)
         {
             throw new NotSupportedException("Can only be used in expressions");