Update Async

Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs

@@ -996,6 +996,11 @@ namespace SqlSugar
             pageIndex = _PageList(pageIndex, pageSize);
             return ToListAsync();
         }
+        public async Task<List<T>> ToPageListAsync(int pageIndex, int pageSize, RefAsync<int> totalNumber)
+        {
+            totalNumber = await this.Clone().CountAsync();
+            return await this.Clone().ToPageListAsync(pageIndex, pageSize);
+        }
         public async Task<string> ToJsonAsync()
         {
             if (IsCache)
@@ -1012,39 +1017,41 @@ namespace SqlSugar
                 return  this.Context.Utilities.SerializeObject(await this.ToListAsync(), typeof(T));
             }
         }
-
         public async Task<string> ToJsonPageAsync(int pageIndex, int pageSize)
         {
             return this.Context.Utilities.SerializeObject(await this.ToPageListAsync(pageIndex, pageSize), typeof(T));
         }
-
-        public Task<string> ToJsonPageAsync(int pageIndex, int pageSize, ref int totalNumber)
+        public async Task<string> ToJsonPageAsync(int pageIndex, int pageSize, RefAsync<int> totalNumber)
         {
-            //False asynchrony with ref
-            return Task.FromResult(ToJsonPage(pageIndex, pageSize, ref totalNumber));
+            totalNumber = await this.Clone().CountAsync();
+            return await this.Clone().ToJsonPageAsync(pageIndex, pageSize);
         }
-        public Task<List<T>> ToPageListAsync(int pageIndex, int pageSize, ref int totalNumber)
+        public async Task<DataTable> ToDataTableAsync()
         {
-            //False asynchrony with ref
-            return Task.FromResult(ToPageList(pageIndex, pageSize, ref totalNumber));
-        }
-
-        public Task<DataTable> ToDataTableAsync()
+            InitMapping();
+            var sqlObj = this.ToSql();
+            RestoreMapping();
+            DataTable result = null;
+            if (IsCache)
             {
-            //False asynchrony with dataTable
-            return Task.FromResult(ToDataTable());
+                var cacheService = this.Context.CurrentConnectionConfig.ConfigureExternalServices.DataInfoCacheService;
+                result = CacheSchemeMain.GetOrCreate<DataTable>(cacheService, this.QueryBuilder, () => { return this.Db.GetDataTable(sqlObj.Key, sqlObj.Value.ToArray()); }, CacheTime, this.Context);
+            }
+            else
+            {
+                result = await this.Db.GetDataTableAsync(sqlObj.Key, sqlObj.Value.ToArray());
+            }
+            return result;
         }
-
         public Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize)
         {
-            //False asynchrony with dataTable
-            return Task.FromResult(ToDataTablePage(pageIndex, pageSize));
+            pageIndex = _PageList(pageIndex, pageSize);
+            return ToDataTableAsync();
         }
-
-        public Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize, ref int totalNumber)
+        public async Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize, RefAsync<int> totalNumber)
         {
-            //False asynchrony with dataTable
-            return Task.FromResult(ToDataTablePage(pageIndex, pageSize, ref totalNumber));
+            totalNumber = await this.Clone().CountAsync();
+            return await this.Clone().ToDataTablePageAsync(pageIndex, pageSize);
         }
         
         #endregion

Src/Asp.Net/SqlSugar/Entities/AsyncRef.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SqlSugar
+{
+    public class RefAsync<T>
+    {
+        public RefAsync() { }
+        public RefAsync(T value) { Value = value; }
+        public T Value { get; set; }
+        public override string ToString()
+        {
+            T value = Value;
+            return value == null ? "" : value.ToString();
+        }
+        public static implicit operator T(RefAsync<T> r) { return r.Value; }
+        public static implicit operator RefAsync<T>(T value) { return new RefAsync<T>(value); }
+    }
+}

Src/Asp.Net/SqlSugar/Interface/IQueryable.cs

@@ -129,7 +129,7 @@ namespace SqlSugar
         string ToJsonPage(int pageIndex, int pageSize);
         Task<string> ToJsonPageAsync(int pageIndex, int pageSize);
         string ToJsonPage(int pageIndex, int pageSize, ref int totalNumber);
-        Task<string> ToJsonPageAsync(int pageIndex, int pageSize,ref int totalNumber);
+        Task<string> ToJsonPageAsync(int pageIndex, int pageSize, RefAsync<int> totalNumber);
         KeyValuePair<string, List<SugarParameter>> ToSql();
 
 
@@ -139,13 +139,13 @@ namespace SqlSugar
         Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize);
         DataTable ToDataTablePage(int pageIndex, int pageSize, ref int totalNumber);
         DataTable ToDataTablePage(int pageIndex, int pageSize, ref int totalNumber,ref int totalPage);
-        Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize,ref int totalNumber);
+        Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize, RefAsync<int> totalNumber);
 
         List<T> ToPageList(int pageIndex, int pageSize);
         Task<List<T>> ToPageListAsync(int pageIndex, int pageSize);
         List<T> ToPageList(int pageIndex, int pageSize, ref int totalNumber);
         List<T> ToPageList(int pageIndex, int pageSize, ref int totalNumber,ref int totalPage);
-        Task<List<T>> ToPageListAsync(int pageIndex, int pageSize,ref int totalNumber);
+        Task<List<T>> ToPageListAsync(int pageIndex, int pageSize, RefAsync<int> totalNumber);
         ISugarQueryable<T> WithCache(int cacheDurationInSeconds = int.MaxValue);
         ISugarQueryable<T> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
         string ToClassString(string className);

Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlServerProvider.cs

@@ -129,7 +129,7 @@ namespace SqlSugar
                 sqlParameter.Size = parameter.Size;
                 sqlParameter.Value = parameter.Value;
                 sqlParameter.DbType = parameter.DbType;
-                if (sqlParameter.Value!=null&&sqlParameter.DbType == System.Data.DbType.DateTime)
+                if (sqlParameter.Value!=null&& sqlParameter.Value != DBNull.Value && sqlParameter.DbType == System.Data.DbType.DateTime)
                 {
                     var date = Convert.ToDateTime(sqlParameter.Value);
                     if (date==DateTime.MinValue)

Src/Asp.Net/SqlSugar/SqlSugar.csproj

@@ -83,6 +83,7 @@
     <Compile Include="Abstract\SaveableProvider\SaveableProvider.cs" />
     <Compile Include="CacheScheme\CacheKeyBuider.cs" />
     <Compile Include="CacheScheme\CacheSchemeMain.cs" />
+    <Compile Include="Entities\AsyncRef.cs" />
     <Compile Include="Entities\CacheKey.cs" />
     <Compile Include="Entities\SugarTerant.cs" />
     <Compile Include="Entities\ConditionalModel.cs" />