Add `OrderByIf` extension method.

Resolve #12611

framework/src/Volo.Abp.Core/System/Linq/AbpQueryableExtensions.cs

@@ -95,4 +95,21 @@ public static class AbpQueryableExtensions
             ? (TQueryable)query.Where(predicate)
             : query;
     }
+
+    /// <summary>
+    /// Order a <see cref="IQueryable{T}"/> by given predicate if given condition is true.
+    /// </summary>
+    /// <param name="query">Queryable to apply filtering</param>
+    /// <param name="condition">A boolean value</param>
+    /// <param name="sorting">Order the query</param>
+    /// <returns>Order or not order query based on <paramref name="condition"/></returns>
+    public static TQueryable OrderByIf<T, TQueryable>([NotNull] this TQueryable query, bool condition, string sorting)
+        where TQueryable : IQueryable<T>
+    {
+        Check.NotNull(query, nameof(query));
+
+        return condition
+            ? (TQueryable)Dynamic.Core.DynamicQueryableExtensions.OrderBy(query, sorting)
+            : query;
+    }
 }

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/Domain/Repositories/EntityFrameworkCore/EfCoreRepository.cs

@@ -252,7 +252,7 @@ public class EfCoreRepository<TDbContext, TEntity> : RepositoryBase<TEntity>, IE
             : await GetDbSetAsync();
 
         return await queryable
-            .OrderBy(sorting)
+            .OrderByIf<TEntity, IQueryable<TEntity>>(!sorting.IsNullOrWhiteSpace(), sorting)
             .PageBy(skipCount, maxResultCount)
             .ToListAsync(GetCancellationToken(cancellationToken));
     }

framework/src/Volo.Abp.MemoryDb/Volo/Abp/Domain/Repositories/MemoryDb/MemoryDbRepository.cs

@@ -285,7 +285,7 @@ public class MemoryDbRepository<TMemoryDbContext, TEntity> : RepositoryBase<TEnt
         CancellationToken cancellationToken = default)
     {
         return (await GetQueryableAsync())
-            .OrderBy(sorting)
+            .OrderByIf<TEntity, IQueryable<TEntity>>(!sorting.IsNullOrWhiteSpace(), sorting)
             .PageBy(skipCount, maxResultCount)
             .ToList();
     }

framework/src/Volo.Abp.MongoDB/Volo/Abp/Domain/Repositories/MongoDB/MongoDbRepository.cs

@@ -465,7 +465,7 @@ public class MongoDbRepository<TMongoDbContext, TEntity>
         cancellationToken = GetCancellationToken(cancellationToken);
 
         return await (await GetMongoQueryableAsync(cancellationToken))
-            .OrderBy(sorting)
+            .OrderByIf<TEntity, IQueryable<TEntity>>(!sorting.IsNullOrWhiteSpace(), sorting)
             .As<IMongoQueryable<TEntity>>()
             .PageBy<TEntity, IMongoQueryable<TEntity>>(skipCount, maxResultCount)
             .ToListAsync(cancellationToken);