CTP5。不支持设置IsModified = false [英] CTP5. Set IsModified = false is not Supported
问题描述
entry.Property（" Password"）。IsModified = false;
------------------- ----------------------
执行此操作后：entry.CurrentValues.SetValues（obj）;
我想还原属性（"密码"）
的更改但我不能手动设置
-----------------
所以，我现在有2个解决方案
1）在entry.CurrentValues.SetValues（obj）之后设置动作"entry.CurrentValues.SetValues（obj）;"
2）之前的obj值; [;密码""由本
变种OriginalPass = entry.OriginalValues设置OBJ值到原来的值。的ToString（）;
ori.Password = OriginalPass ;
entry.Property（" Password"）。IsModified = false; //我不想更新它但我不能设置为false
-------------------------------- -----
< blockquote>
Sipo，
允许将IsModified设置为false是我们计划在未来支持的事情但它需要对核心EF组件进行更改，因此它在第一版Code First / Productivity Improv的
中无法使用ements。
就目前而言，正如您所说，您最好的办法是确保密码永远不会被标记为已修改。
需要注意的一点是，如果修改后的对象上的Password值与数据库中对象的值相同，则调用SetValues不会将其标记为已修改。&NBSP;
例如，这应该有效：
var entity = context.Foos.Find（obj.Id）;
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
obj.Password = entity.Password;
context.Entry（实体）.CurrentValues.SetValues（OBJ）;
另一种方法是明确只为您感兴趣的属性设置新值。
例如：
foreach （ var propertyName
in context.Entry（entity）。CurrentValues.PropertyNames）
<跨度风格="">&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
{
<跨度风格="">&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
如果（propertyName！=
"密码" ）
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
{
<跨度风格="">&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;
context.Entry（entity）.Property（propertyName）。CurrentValue =
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
context.Entry（obj）.Property（propertyName）。CurrentValue;
<跨度风格= "">&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
}
}
您还可以创建一个DTO类型对象，该对象仅包含您感兴趣的属性，而是设置该对象的当前值。
例如：
public class
Foo
{
public int Id {
获得; set ; }
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
public string 用户名{
获得; set ; }
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
public string 密码{
获得; set ; }
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
public string Blah {
获得; set ; }
&NBSP;&NBSP;&NBSP;
}
&NBSP;&NBSP;&NBSP;
public class
FooDto
{
public int Id {
获得; set ; }
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
public string 用户名{
获得; set ; }
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
public string Blah {
获得; set ; }
&NBSP;&NBSP;&NBSP;
}
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
...
< span style ="">
var obj = new
FooDto （）; //填充所有DTO属性
var entity = context.Foos.Find（obj.Id）;
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
context.Entry（实体）.CurrentValues.SetValues（OBJ）;
希望这有帮助。
谢谢，
Arthur
entry.Property("Password").IsModified = false;
-----------------------------------------
After I do this : entry.CurrentValues.SetValues(obj);
I want to revert changes for Property("Password")
but I can not set by hand
-----------------
so, there is 2 solution for me now
1) set the obj value before the action "entry.CurrentValues.SetValues(obj);"
2) after entry.CurrentValues.SetValues(obj); set the obj value to original value by this
var OriginalPass = entry.OriginalValues["Password"].ToString();
ori.Password = OriginalPass;
entry.Property("Password").IsModified = false;// I don't want to update it but I can't set to false
-------------------------------------
Sipo,
Allowing setting IsModified to false is something we plan to support in the future but it requires changes to the core EF assembly so it won’t be available in the first release of Code First/Productivity Improvements.
For now, as you say, your best bet is to make sure that Password never gets marked as modified. One thing to note is that if the value of Password on the modified object is the same as it is on the object from the database, then calling SetValues will not mark it as modified. For example, this should work:
var entity = context.Foos.Find(obj.Id);
obj.Password = entity.Password;
context.Entry(entity).CurrentValues.SetValues(obj);
Another approach is to explicitly only set new values for the properties that you are interested in. For example:
foreach (var propertyName in context.Entry(entity).CurrentValues.PropertyNames)
{
if (propertyName != "Password")
{
context.Entry(entity).Property(propertyName).CurrentValue =
context.Entry(obj).Property(propertyName).CurrentValue;
}
}
You could also create a DTO type object that only contains the properties you are interested in and instead set current values from that object. For example:
public class Foo
{
public int Id { get; set; }
public string Username { get; set; }
public string Password { get; set; }
public string Blah { get; set; }
}
public class FooDto
{
public int Id { get; set; }
public string Username { get; set; }
public string Blah { get; set; }
}
...
var obj = new FooDto(); // Populate all DTO properties
var entity = context.Foos.Find(obj.Id);
context.Entry(entity).CurrentValues.SetValues(obj);
Hope this helps.
Thanks,
Arthur
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