add whereif

dotnetcore · May 15, 2021 · 440f093 · 440f093
1 parent bdc4550
commit 440f093
Showing 1 changed file with 26 additions and 1 deletion.
diff --git a/src/WalkingTec.Mvvm.Core/Extensions/DCExtension.cs b/src/WalkingTec.Mvvm.Core/Extensions/DCExtension.cs
@@ -666,7 +666,15 @@ public static IQueryable<T> CheckNull<T>(this IQueryable<T> baseQuery, Expressio
             return baseQuery.Where(Expression.Lambda<Func<T, bool>>(Expression.Equal(peid, Expression.Constant(null)), pe));
         }
 
-
+        /// <summary>
+        /// val不为空时，附加查询条件
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <typeparam name="S"></typeparam>
+        /// <param name="baseQuery"></param>
+        /// <param name="val"></param>
+        /// <param name="where"></param>
+        /// <returns></returns>
         public static IQueryable<T> CheckWhere<T, S>(this IQueryable<T> baseQuery, S val, Expression<Func<T, bool>> where)
         {
             if (val == null)
@@ -690,6 +698,23 @@ public static IQueryable<T> CheckWhere<T, S>(this IQueryable<T> baseQuery, S val
             }
         }
 
+        /// <summary>
+        /// 条件为true时，附加查询条件
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="baseQuery"></param>
+        /// <param name="val">bool?</param>
+        /// <param name="where"></param>
+        /// <returns></returns>
+        public static IQueryable<T> WhereIf<T>(this IQueryable<T> baseQuery, bool? val, Expression<Func<T, bool>> where)
+        {
+            if (val == null || val == false)
+            {
+                return baseQuery;
+            }
+            return baseQuery.Where(where);
+        }
+
         public static IQueryable<T> CheckEqual<T>(this IQueryable<T> baseQuery, string val, Expression<Func<T, string>> field)
         {
             if (val == null || val == "")