Make user search parameters nullable and support paging.

modules/identity/src/Volo.Abp.Identity.Application.Contracts/Volo/Abp/Identity/UserLookupSearchInputDto.cs

@@ -2,7 +2,7 @@
 
 namespace Volo.Abp.Identity
 {
-    public class UserLookupSearchInputDto : LimitedResultRequestDto, ISortedResultRequest
+    public class UserLookupSearchInputDto : PagedResultRequestDto, ISortedResultRequest
     {
         public string Sorting { get; set; }
 

modules/identity/src/Volo.Abp.Identity.Application/Volo/Abp/Identity/IdentityUserLookupAppService.cs

@@ -45,7 +45,8 @@ namespace Volo.Abp.Identity
             var users = await UserLookupServiceProvider.SearchAsync(
                 input.Sorting,
                 input.Filter,
-                input.MaxResultCount
+                input.MaxResultCount,
+                input.SkipCount
             );
 
             return new ListResultDto<UserData>(

modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserRepositoryExternalUserLookupServiceProvider.cs

@@ -49,14 +49,16 @@ namespace Volo.Abp.Identity
         }
 
         public virtual async Task<List<IUserData>> SearchAsync(
-            string sorting,
-            string filter, 
-            int maxResultCount,
+            string sorting = null,
+            string filter = null,
+            int maxResultCount = int.MaxValue,
+            int skipCount = 0,
             CancellationToken cancellationToken = default)
         {
             var users = await UserRepository.GetListAsync(
                 sorting: sorting,
                 maxResultCount: maxResultCount,
+                skipCount: skipCount,
                 filter: filter,
                 includeDetails: false,
                 cancellationToken: cancellationToken

modules/identity/src/Volo.Abp.Identity.HttpApi.Client/Volo/Abp/Identity/HttpClientIdentityUserLookupService.cs

@@ -29,16 +29,19 @@ namespace Volo.Abp.Identity
         }
 
         public async Task<List<IUserData>> SearchAsync(
-            string sorting,
-            string filter, 
-            int maxResultCount, 
+            string sorting = null,
+            string filter = null, 
+            int maxResultCount = int.MaxValue,
+            int skipCount = 0,
             CancellationToken cancellationToken = default)
         {
             var result = await UserLookupAppService.SearchAsync(
                 new UserLookupSearchInputDto
                 {
                     Filter = filter,
-                    MaxResultCount = maxResultCount
+                    MaxResultCount = maxResultCount,
+                    SkipCount = skipCount,
+                    Sorting = sorting
                 }
             );
 

modules/users/src/Volo.Abp.Users.Abstractions/Volo/Abp/Users/IExternalUserLookupServiceProvider.cs

@@ -12,9 +12,10 @@ namespace Volo.Abp.Users
         Task<IUserData> FindByUserNameAsync(string userName, CancellationToken cancellationToken = default);
 
         Task<List<IUserData>> SearchAsync(
-            string sorting,
-            string filter,
-            int maxResultCount,
+            string sorting = null,
+            string filter = null,
+            int maxResultCount = int.MaxValue,
+            int skipCount = 0,
             CancellationToken cancellationToken = default);
     }
 }

modules/users/src/Volo.Abp.Users.Domain/Volo/Abp/Users/IUserLookupService.cs

@@ -13,9 +13,10 @@ namespace Volo.Abp.Users
         Task<TUser> FindByUserNameAsync(string userName, CancellationToken cancellationToken = default);
 
         Task<List<IUserData>> SearchAsync(
-            string sorting,
-            string filter,
-            int maxResultCount,
+            string sorting = null,
+            string filter = null,
+            int maxResultCount = int.MaxValue,
+            int skipCount = 0,
             CancellationToken cancellationToken = default);
     }
 }

modules/users/src/Volo.Abp.Users.Domain/Volo/Abp/Users/UserLookupService.cs

@@ -140,15 +140,37 @@ namespace Volo.Abp.Users
             return await _userRepository.FindAsync(externalUser.Id, cancellationToken: cancellationToken);
         }
 
-        public async Task<List<IUserData>> SearchAsync(string sorting, string filter, int maxResultCount, CancellationToken cancellationToken = default)
+        public async Task<List<IUserData>> SearchAsync(
+            string sorting = null,
+            string filter = null,
+            int maxResultCount = int.MaxValue,
+            int skipCount = 0,
+            CancellationToken cancellationToken = default)
         {
             if (ExternalUserLookupServiceProvider != null)
             {
-                return await ExternalUserLookupServiceProvider.SearchAsync(sorting, filter, maxResultCount, cancellationToken);
-            }
-
-            var localUsers = await _userRepository.SearchAsync(sorting, maxResultCount, 0, filter, cancellationToken);
-            return localUsers.Cast<IUserData>().ToList();
+                return await ExternalUserLookupServiceProvider
+                    .SearchAsync(
+                        sorting,
+                        filter,
+                        maxResultCount,
+                        skipCount,
+                        cancellationToken
+                    );
+            }
+
+            var localUsers = await _userRepository
+                .SearchAsync(
+                    sorting,
+                    maxResultCount,
+                    skipCount,
+                    filter,
+                    cancellationToken
+                );
+            
+            return localUsers
+                .Cast<IUserData>()
+                .ToList();
         }
 
         protected abstract TUser CreateUser(IUserData externalUser);

modules/users/src/Volo.Abp.Users.MongoDB/Volo/Abp/Users/MongoDB/MongoUserRepositoryBase.cs

@@ -33,7 +33,7 @@ namespace Volo.Abp.Users.MongoDB
 
         public async Task<List<TUser>> SearchAsync(
             string sorting = null, 
-            int maxResultCount = int.MaxValue, 
+            int maxResultCount = int.MaxValue,
             int skipCount = 0,
             string filter = null,
             CancellationToken cancellationToken = default)