diff --git a/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs b/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs
index 99e0e1be4..5e6327a3a 100644
--- a/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs
+++ b/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs
@@ -219,6 +219,15 @@ namespace OrmTest.Demo
             var list2 = db.Queryable<Student>()
                  .WhereIF(!string.IsNullOrEmpty(name), it => it.Name == name)
                  .WhereIF(!string.IsNullOrEmpty(name2), it => it.Name == name2).ToList();
+
+
+
+            //join 
+            var list3 = db.Queryable<Student, School>((st, sc) => new object[] {
+              JoinType.Left,st.SchoolId==sc.Id
+            })
+            .WhereIf(false, (st, sc) => sc.Id == 1)
+            .WhereIf(false, (st, sc) => st.Id == 1).ToList();
         }
         public static void Join()
         {
diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
index cee8117ce..de46ec849 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
@@ -223,7 +223,8 @@ namespace SqlSugar
             var fieldName = lamResult.GetResultString();
             return In(fieldName, inValues);
         }
-        public virtual ISugarQueryable<T> In<TParamter>(List<TParamter> pkValues) {
+        public virtual ISugarQueryable<T> In<TParamter>(List<TParamter> pkValues)
+        {
             if (pkValues == null || pkValues.Count == 0)
             {
                 Where(SqlBuilder.SqlFalse);
@@ -231,7 +232,8 @@ namespace SqlSugar
             }
             return In(pkValues.ToArray());
         }
-        public virtual ISugarQueryable<T> In<FieldType>(string InFieldName, List<FieldType> inValues) {
+        public virtual ISugarQueryable<T> In<FieldType>(string InFieldName, List<FieldType> inValues)
+        {
             if (inValues == null || inValues.Count == 0)
             {
                 Where(SqlBuilder.SqlFalse);
@@ -239,7 +241,8 @@ namespace SqlSugar
             }
             return In(InFieldName, inValues.ToArray());
         }
-        public virtual ISugarQueryable<T> In<FieldType>(Expression<Func<T, object>> expression, List<FieldType> inValues) {
+        public virtual ISugarQueryable<T> In<FieldType>(Expression<Func<T, object>> expression, List<FieldType> inValues)
+        {
             if (inValues == null || inValues.Count == 0)
             {
                 Where(SqlBuilder.SqlFalse);
@@ -662,6 +665,18 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
+        public ISugarQueryable<T, T2> WhereIf(bool isWhere, Expression<Func<T, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+        public ISugarQueryable<T, T2> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
         #endregion
 
         #region Select
@@ -773,6 +788,26 @@ namespace SqlSugar
             return this;
         }
 
+        public ISugarQueryable<T, T2, T3> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3> WhereIf(bool isWhere,Expression<Func<T, T2, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public  ISugarQueryable<T, T2, T3> WhereIf(bool isWhere, Expression<Func<T, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
         #endregion
 
     }
@@ -801,6 +836,34 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
+
+        public ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
         #endregion
 
         #region Select
@@ -894,6 +957,41 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
+
+        public ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
         #endregion
 
         #region Select
@@ -1006,6 +1104,48 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
         #endregion
 
         #region Select
@@ -1137,6 +1277,55 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
         #endregion
 
         #region Select
@@ -1240,6 +1429,7 @@ namespace SqlSugar
             _GroupBy(expression);
             return this;
         }
+
         #endregion
     }
     #endregion
@@ -1287,6 +1477,62 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
+
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, bool>> expression)
+        {
+            if (isWhere)
+                _Where(expression);
+            return this;
+        }
         #endregion
 
         #region Select
@@ -1404,6 +1650,7 @@ namespace SqlSugar
             _GroupBy(expression);
             return this;
         }
+
         #endregion
     }
     #endregion
diff --git a/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs b/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
index f06d39bf5..5f57353d3 100644
--- a/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
+++ b/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
@@ -96,6 +96,9 @@ namespace SqlSugar
         #region Where
         new ISugarQueryable<T, T2> Where(Expression<Func<T, bool>> expression);
         ISugarQueryable<T, T2> Where(Expression<Func<T, T2, bool>> expression);
+
+        ISugarQueryable<T, T2> WhereIf(bool isWhere,Expression<Func<T, bool>> expression);
+        ISugarQueryable<T, T2> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression);
         #endregion
 
         #region Select
@@ -118,6 +121,10 @@ namespace SqlSugar
         new ISugarQueryable<T, T2, T3> Where(Expression<Func<T, bool>> expression);
         ISugarQueryable<T, T2, T3> Where(Expression<Func<T, T2, bool>> expression);
         ISugarQueryable<T, T2, T3> Where(Expression<Func<T, T2, T3, bool>> expression);
+
+        ISugarQueryable<T, T2, T3> WhereIf(bool isWhere, Expression<Func<T, bool>> expression);
+        ISugarQueryable<T, T2, T3> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression);
+        ISugarQueryable<T, T2, T3> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression);
         #endregion
 
         #region Select
@@ -144,6 +151,11 @@ namespace SqlSugar
         ISugarQueryable<T, T2, T3, T4> Where(Expression<Func<T, T2, bool>> expression);
         ISugarQueryable<T, T2, T3, T4> Where(Expression<Func<T, T2, T3, bool>> expression);
         ISugarQueryable<T, T2, T3, T4> Where(Expression<Func<T, T2, T3, T4, bool>> expression);
+
+        new ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression);
         #endregion
 
         #region Select
@@ -174,6 +186,13 @@ namespace SqlSugar
         ISugarQueryable<T, T2, T3, T4, T5> Where(Expression<Func<T, T2, T3, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5> Where(Expression<Func<T, T2, T3, T4, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5> Where(Expression<Func<T, T2, T3, T4, T5, bool>> expression);
+
+
+        ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression);
         #endregion
 
         #region Select
@@ -208,6 +227,13 @@ namespace SqlSugar
         ISugarQueryable<T, T2, T3, T4, T5, T6> Where(Expression<Func<T, T2, T3, T4, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5, T6> Where(Expression<Func<T, T2, T3, T4, T5, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5, T6> Where(Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression);
+
+        ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression);
         #endregion
 
         #region Select
@@ -246,6 +272,14 @@ namespace SqlSugar
         ISugarQueryable<T, T2, T3, T4, T5, T6, T7> Where(Expression<Func<T, T2, T3, T4, T5, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5, T6, T7> Where(Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5, T6, T7> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, bool>> expression);
+
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, bool>> expression);
         #endregion
 
         #region Select
@@ -288,6 +322,15 @@ namespace SqlSugar
         ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> Where(Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, bool>> expression);
         ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, bool>> expression);
+
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, bool>> expression);
+        ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WhereIf(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, bool>> expression);
         #endregion                              
 
         #region Select