当 SaveChanges() 不成功时，如何撤消更改？

发布于 2024-09-07 05:27:11 字数 250 浏览 7 评论 0原文

当 SaveChanges() 不成功时如何撤消更改？

contextObject.Toto.AddObject( new Toto());

try
{
    contextObject.SaveChanges();
}
catch
{
      // Undo changes !
}

在此示例中，我想删除内存中的新 Toto 对象。我不想手动删除它。我想将我的 contextObject 同步到我的数据库。

原文

How can I undo changes when a SaveChanges() doesn't succeed ?

contextObject.Toto.AddObject( new Toto());

try
{
    contextObject.SaveChanges();
}
catch
{
      // Undo changes !
}

In this sample, I'd like to remove the new Toto object in memory. I don't want to remove it manually. I'd like to synchronize my contextObject to my database.

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一桥轻雨一伞开 2024-09-14 05:27:11

微软正在努力解决这个问题：无法刷新 ObjectContext 中的某些项目

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梦途 2024-09-14 05:27:11

保存更改并管理并发：

try
{
    // Try to save changes, which may cause a conflict.
    int num = context.SaveChanges();
    Console.WriteLine("No conflicts. " +
        num.ToString() + " updates saved.");
}
catch (OptimisticConcurrencyException)
{
    // Resolve the concurrency conflict by refreshing the 
    // object context before re-saving changes. 
    context.Refresh(RefreshMode.ClientWins, orders);

    // Save changes.
    context.SaveChanges();
    Console.WriteLine("OptimisticConcurrencyException "
    + "handled and changes saved");
}

Saving Changes and Managing Concurrency:

try
{
    // Try to save changes, which may cause a conflict.
    int num = context.SaveChanges();
    Console.WriteLine("No conflicts. " +
        num.ToString() + " updates saved.");
}
catch (OptimisticConcurrencyException)
{
    // Resolve the concurrency conflict by refreshing the 
    // object context before re-saving changes. 
    context.Refresh(RefreshMode.ClientWins, orders);

    // Save changes.
    context.SaveChanges();
    Console.WriteLine("OptimisticConcurrencyException "
    + "handled and changes saved");
}

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