- 增加 ISelectGrouping 分组查询总量的方法 .Count()；

FreeSql.Tests/FreeSql.Tests.Provider.MySqlConnector/MySqlConnector/Curd/MySqlSelectTest.cs

@@ -722,6 +722,7 @@ namespace FreeSql.Tests.MySqlConnector
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests.Provider.Odbc/Dameng/Curd/DamengSelectTest.cs

@@ -648,6 +648,7 @@ namespace FreeSql.Tests.Odbc.Dameng
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests.Provider.Odbc/Default/Curd/OdbcSelectTest.cs

@@ -639,6 +639,7 @@ namespace FreeSql.Tests.Odbc.Default
             .OrderBy(a => a.Key.tt2)
             .OrderByDescending(a => a.Count())
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests.Provider.Odbc/MySql/Curd/MySqlSelectTest.cs

@@ -732,6 +732,7 @@ namespace FreeSql.Tests.Odbc.MySql
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests.Provider.Odbc/Oracle/Curd/OracleSelectTest.cs

@@ -648,6 +648,7 @@ namespace FreeSql.Tests.Odbc.Oracle
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests.Provider.Odbc/PostgreSQL/Curd/PostgreSQLSelectTest.cs

@@ -710,6 +710,7 @@ namespace FreeSql.Tests.Odbc.PostgreSQL
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests.Provider.Odbc/SqlServer/Curd/SqlServerSelectTest.cs

@@ -604,6 +604,7 @@ namespace FreeSql.Tests.Odbc.SqlServer
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests/MySql/Curd/MySqlSelectTest.cs

@@ -763,6 +763,7 @@ namespace FreeSql.Tests.MySql
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests/Oracle/Curd/OracleSelectTest.cs

@@ -648,6 +648,7 @@ namespace FreeSql.Tests.Oracle
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests/PostgreSQL/Curd/PostgreSQLSelectTest.cs

@@ -727,6 +727,7 @@ namespace FreeSql.Tests.PostgreSQL
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests/SqlServer/Curd/SqlServerSelectTest.cs

@@ -652,6 +652,7 @@ namespace FreeSql.Tests.SqlServer
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql.Tests/FreeSql.Tests/Sqlite/Curd/SqliteSelectTest.cs

@@ -601,6 +601,7 @@ namespace FreeSql.Tests.Sqlite
             .OrderByDescending(a => a.Count())
             .Offset(10)
             .Limit(2)
+            .Count(out var trycount)
             .ToList(a => new
             {
                 a.Key.tt2,

FreeSql/FreeSql.xml

@@ -1776,6 +1776,19 @@
             <param name="pageSize">每页多少</param>
             <returns></returns>
         </member>
+        <member name="M:FreeSql.ISelectGrouping`2.Count">
+            <summary>
+            查询的记录数量
+            </summary>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.ISelectGrouping`2.Count(System.Int64@)">
+            <summary>
+            查询的记录数量，以参数out形式返回
+            </summary>
+            <param name="count">返回的变量</param>
+            <returns></returns>
+        </member>
         <member name="P:FreeSql.ISelectGroupingAggregate`1.Key">
             <summary>
             分组的数据

FreeSql/Interface/Curd/ISelect/ISelectGrouping.cs

@@ -11,6 +11,7 @@ namespace FreeSql
 
 #if net40
 #else
+        Task<long> CountAsync();
         Task<List<TReturn>> ToListAsync<TReturn>(Expression<Func<ISelectGroupingAggregate<TKey, TValue>, TReturn>> select);
 #endif
 
@@ -95,6 +96,18 @@ namespace FreeSql
         /// <param name="pageSize">每页多少</param>
         /// <returns></returns>
         ISelectGrouping<TKey, TValue> Page(int pageNumber, int pageSize);
+
+        /// <summary>
+        /// 查询的记录数量
+        /// </summary>
+        /// <returns></returns>
+        long Count();
+        /// <summary>
+        /// 查询的记录数量，以参数out形式返回
+        /// </summary>
+        /// <param name="count">返回的变量</param>
+        /// <returns></returns>
+        ISelectGrouping<TKey, TValue> Count(out long count);
     }
 
     public interface ISelectGroupingAggregate<TKey>

FreeSql/Internal/CommonProvider/SelectProvider/Select0Provider.cs

@@ -1052,7 +1052,7 @@ namespace FreeSql.Internal.CommonProvider
 
             _commonExpression.ReadAnonymousField(_tables, field, map, ref index, columns, null, _whereCascadeExpression, true);
             this.GroupBy(field.Length > 0 ? field.Remove(0, 2).ToString() : null);
-            return new SelectGroupingProvider<TKey, TValue>(this, map, _commonExpression, _tables);
+            return new SelectGroupingProvider<TKey, TValue>(_orm, this, map, _commonExpression, _tables);
         }
         protected TSelect InternalJoin(Expression exp, SelectTableInfoType joinType)
         {

FreeSql/Internal/CommonProvider/SelectProvider/SelectGroupingProvider.cs

@@ -11,13 +11,14 @@ namespace FreeSql.Internal.CommonProvider
 {
     public class SelectGroupingProvider<TKey, TValue> : ISelectGrouping<TKey, TValue>
     {
-
+        internal IFreeSql _orm;
         internal object _select;
         internal ReadAnonymousTypeInfo _map;
         internal CommonExpression _comonExp;
         internal List<SelectTableInfo> _tables;
-        public SelectGroupingProvider(object select, ReadAnonymousTypeInfo map, CommonExpression comonExp, List<SelectTableInfo> tables)
+        public SelectGroupingProvider(IFreeSql orm, object select, ReadAnonymousTypeInfo map, CommonExpression comonExp, List<SelectTableInfo> tables)
         {
+            _orm = orm;
             _select = select;
             _map = map;
             _comonExp = comonExp;
@@ -162,8 +163,17 @@ namespace FreeSql.Internal.CommonProvider
             return this;
         }
 
+        public long Count() => long.TryParse(string.Concat(_orm.Ado.ExecuteScalar($"select count(1) from ({this.ToSql("1 as1")}) fta")), out var trylng) ? trylng : default(long);
+        public ISelectGrouping<TKey, TValue> Count(out long count)
+        {
+            count = this.Count();
+            return this;
+        }
+
 #if net40
 #else
+        async public Task<long> CountAsync() => long.TryParse(string.Concat(await _orm.Ado.ExecuteScalarAsync($"select count(1) from ({this.ToSql("1 as1")}) fta")), out var trylng) ? trylng : default(long);
+
         public Task<List<TReturn>> ToListAsync<TReturn>(Expression<Func<ISelectGroupingAggregate<TKey, TValue>, TReturn>> select)
         {
             var map = new ReadAnonymousTypeInfo();