- 完善 DbContext/UnitOfWork EntityChange 更新对象之前的值；

FreeSql.DbContext/DbContext/DbContext.cs

@@ -243,6 +243,10 @@ namespace FreeSql
             public class ChangeInfo
             {
                 public object Object { get; set; }
+                /// <summary>
+                /// Type = Update 的时候，获取更新之前的对象
+                /// </summary>
+                public object BeforeObject { get; set; }
                 public EntityChangeType Type { get; set; }
             }
             /// <summary>

FreeSql.DbContext/DbSet/DbSetAsync.cs

@@ -363,15 +363,16 @@ namespace FreeSql
 
             if (data?.Count > 0)
             {
-
                 if (cuig.Length == _table.Columns.Count)
                     return ups.Length == data.Count ? -998 : -997;
 
-                var updateSource = data.Select(a => a.Value).ToArray();
+                var update = this.OrmUpdate(null).SetSource(data.Select(a => a.Value)).IgnoreColumns(cuig);
-                var update = this.OrmUpdate(null).SetSource(updateSource).IgnoreColumns(cuig);
-
                 var affrows = await update.ExecuteAffrowsAsync();
-                _db._entityChangeReport.AddRange(updateSource.Select(a => new DbContext.EntityChangeReport.ChangeInfo { Object = a, Type = DbContext.EntityChangeType.Update }));
+                _db._entityChangeReport.AddRange(data.Select(a => new DbContext.EntityChangeReport.ChangeInfo { 
+                    Object = a.Value, 
+                    BeforeObject = _states.TryGetValue(a.Key, out var beforeVal) ? beforeVal.Value : null, 
+                    Type = DbContext.EntityChangeType.Update 
+                }));
 
                 foreach (var newval in data)
                 {

FreeSql.DbContext/DbSet/DbSetSync.cs

@@ -399,15 +399,17 @@ namespace FreeSql
 
             if (data?.Count > 0)
             {
-
                 if (cuig.Length == _table.Columns.Count)
                     return ups.Length == data.Count ? -998 : -997;
 
-                var updateSource = data.Select(a => a.Value).ToArray();
+                var update = this.OrmUpdate(null).SetSource(data.Select(a => a.Value)).IgnoreColumns(cuig);
-                var update = this.OrmUpdate(null).SetSource(updateSource).IgnoreColumns(cuig);
-
                 var affrows = update.ExecuteAffrows();
-                _db._entityChangeReport.AddRange(updateSource.Select(a => new DbContext.EntityChangeReport.ChangeInfo { Object = a, Type = DbContext.EntityChangeType.Update }));
+                _db._entityChangeReport.AddRange(data.Select(a => new DbContext.EntityChangeReport.ChangeInfo
+                {
+                    Object = a.Value,
+                    BeforeObject = _states.TryGetValue(a.Key, out var beforeVal) ? beforeVal.Value : null,
+                    Type = DbContext.EntityChangeType.Update
+                }));
 
                 foreach (var newval in data)
                 {

FreeSql.DbContext/FreeSql.DbContext.xml

@@ -57,6 +57,11 @@
             <typeparam name="TEntity"></typeparam>
             <param name="data"></param>
         </member>
+        <member name="P:FreeSql.DbContext.EntityChangeReport.ChangeInfo.BeforeObject">
+            <summary>
+            Type = Update 的时候，获取更新之前的对象
+            </summary>
+        </member>
         <member name="P:FreeSql.DbContext.EntityChangeReport.Report">
             <summary>
             实体变化记录

FreeSql.DbContext/readme.md

@@ -191,7 +191,7 @@ uow.OnEntityChange = report => {
 参数 report 是一个 List 集合，集合元素的类型定义如下：
 
 ```csharp
-public class EntityChangeInfo
+public class ChangeInfo
 {
     public object Object { get; set; }
     public EntityChangeType Type { get; set; }

FreeSql.Repository/readme.md

@@ -213,7 +213,7 @@ uow.OnEntityChange = report => {
 参数 report 是一个 List 集合，集合元素的类型定义如下：
 
 ```csharp
-public class EntityChangeInfo
+public class ChangeInfo
 {
     public object Object { get; set; }
     public EntityChangeType Type { get; set; }