Question

我读了这个问题，但不幸的是，在还原更改后没有找到任何更新ui的解决方案。

How can I reject all changes in a Linq to SQL's DataContext?

我所有的属性都来自INotifyPropertyChanged。

var changeSet = dataContext.GetChangeSet();
if (changeSet != null)
{
    var updates = changeSet.Updates.ToArray();
    dataContext.Refresh(RefreshMode.OverwriteCurrentValues, changeSet.Updates);

    foreach (var o in updates)
    {
        INotifyPropertyChanged entity = (INotifyPropertyChanged)o;
        // What i have to do to force them trigger PropertyChanged event ???
    }
}

Answer 1

首先，我向所有Linq2SQL类添加一个方法：

public partial class Setting
{
    public void SendPropertyChangedFromOutside(string propName)
    {
        SendPropertyChanged(propName);
    }
}

public partial class User
{
    public void SendPropertyChangedFromOutside(string propName)
    {
        SendPropertyChanged(propName);
    }
}

然后调用UndoDBChanges方法：

public static void UndoDBChanges(System.Data.Linq.DataContext dataContext) {
var changeSet = dataContext.GetChangeSet();
if (changeSet != null)
{
    var updates = changeSet.Updates.ToArray();
    dataContext.Refresh(RefreshMode.OverwriteCurrentValues, changeSet.Updates);

    foreach (var o in updates)
    {
        try
        {
            Type t = o.GetType();
            dynamic obj = Convert.ChangeType(o, t);

            foreach (System.Reflection.PropertyInfo prop in t.GetProperties())
            {
                obj.SendPropertyChangedFromOutside(prop.Name);
            }
        }
        catch
        { }
    }
}}

从LINQ还原到SQL后的WPF更新UI

1 个答案: