- 增加 ISelect.First<Dto>() 方法；

FreeSql/FreeSql.xml

@@ -1032,6 +1032,13 @@
             <param name="select">选择列</param>
             <returns></returns>
         </member>
+        <member name="M:FreeSql.ISelect`1.ToOne``1">
+            <summary>
+            执行SQL查询，返回 TDto 映射的字段，记录不存在时返回 Dto 默认值
+            </summary>
+            <typeparam name="TDto"></typeparam>
+            <returns></returns>
+        </member>
         <member name="M:FreeSql.ISelect`1.First``1(System.Linq.Expressions.Expression{System.Func{`0,``0}})">
             <summary>
             执行SQL查询，返回指定字段的记录的第一条记录，记录不存在时返回 TReturn 默认值
@@ -1040,6 +1047,13 @@
             <param name="select">选择列</param>
             <returns></returns>
         </member>
+        <member name="M:FreeSql.ISelect`1.First``1">
+            <summary>
+            执行SQL查询，返回 TDto 映射的字段，记录不存在时返回 Dto 默认值
+            </summary>
+            <typeparam name="TDto"></typeparam>
+            <returns></returns>
+        </member>
         <member name="M:FreeSql.ISelect`1.ToSql``1(System.Linq.Expressions.Expression{System.Func{`0,``0}})">
             <summary>
             返回即将执行的SQL语句

FreeSql/Interface/Curd/ISelect/ISelect1.cs

@@ -48,6 +48,13 @@ namespace FreeSql
         /// <returns></returns>
         TReturn ToOne<TReturn>(Expression<Func<T1, TReturn>> select);
         Task<TReturn> ToOneAsync<TReturn>(Expression<Func<T1, TReturn>> select);
+        /// <summary>
+        /// 执行SQL查询，返回 TDto 映射的字段，记录不存在时返回 Dto 默认值
+        /// </summary>
+        /// <typeparam name="TDto"></typeparam>
+        /// <returns></returns>
+        TDto ToOne<TDto>();
+        Task<TDto> ToOneAsync<TDto>();
 
         /// <summary>
         /// 执行SQL查询，返回指定字段的记录的第一条记录，记录不存在时返回 TReturn 默认值
@@ -57,6 +64,13 @@ namespace FreeSql
         /// <returns></returns>
         TReturn First<TReturn>(Expression<Func<T1, TReturn>> select);
         Task<TReturn> FirstAsync<TReturn>(Expression<Func<T1, TReturn>> select);
+        /// <summary>
+        /// 执行SQL查询，返回 TDto 映射的字段，记录不存在时返回 Dto 默认值
+        /// </summary>
+        /// <typeparam name="TDto"></typeparam>
+        /// <returns></returns>
+        TDto First<TDto>();
+        Task<TDto> FirstAsync<TDto>();
 
         /// <summary>
         /// 返回即将执行的SQL语句

FreeSql/Internal/CommonProvider/SelectProvider/Select1Provider.cs

@@ -372,16 +372,17 @@ namespace FreeSql.Internal.CommonProvider
         }
 
         public bool Any(Expression<Func<T1, bool>> exp) => this.Where(exp).Any();
-
         public Task<bool> AnyAsync(Expression<Func<T1, bool>> exp) => this.Where(exp).AnyAsync();
 
         public TReturn ToOne<TReturn>(Expression<Func<T1, TReturn>> select) => this.Limit(1).ToList(select).FirstOrDefault();
-
         async public Task<TReturn> ToOneAsync<TReturn>(Expression<Func<T1, TReturn>> select) => (await this.Limit(1).ToListAsync(select)).FirstOrDefault();
+        public TDto ToOne<TDto>() => this.Limit(1).ToList<TDto>().FirstOrDefault();
+        async public Task<TDto> ToOneAsync<TDto>() => (await this.Limit(1).ToListAsync<TDto>()).FirstOrDefault();
 
         public TReturn First<TReturn>(Expression<Func<T1, TReturn>> select) => this.ToOne(select);
-
         public Task<TReturn> FirstAsync<TReturn>(Expression<Func<T1, TReturn>> select) => this.ToOneAsync(select);
+        public TDto First<TDto>() => this.ToOne<TDto>();
+        public Task<TDto> FirstAsync<TDto>() => this.ToOneAsync<TDto>();
 
         public ISelect<T1> Include<TNavigate>(Expression<Func<T1, TNavigate>> navigateSelector) where TNavigate : class
         {