我在Silverlight的数据表单中遇到提交和取消按钮时遇到问题。 起初我无法弄清楚当用户点击编辑时为什么没有启用取消按钮。经过一些研究后我发现这是因为该对象不是IEditableObject。这对取消按钮进行了排序,但现在提交按钮已经决定启用,即使在值发生变化之后,它仍然没有被启用。
我的问题是,如何启用它?
XAML:
<dataFormToolkit:DataForm CurrentItem="{Binding ViewModel, ElementName=AccountPage, Mode=TwoWay}" CommandButtonsVisibility="{Binding ViewModel.CommandButtonsVisibility, ElementName=AccountPage, Mode=TwoWay}" AutoEdit="False" AutoGenerateFields="False" AutoCommit="False">
<dataFormToolkit:DataForm.EditTemplate>
<DataTemplate>
<StackPanel>
<dataFormToolkit:DataField Label="Organisation Name">
<TextBox Text="{Binding Customer.Name, Mode=TwoWay}"/>
</dataFormToolkit:DataField>
</StackPanel>
</DataTemplate>
</dataFormToolkit:DataForm.EditTemplate>
</dataFormToolkit:DataForm>
XAML.cs:
public partial class Account : Page
{
public VMAccount ViewModel { get; set; }
public Account()
{
InitializeComponent();
}
// Executes when the user navigates to this page.
protected override void OnNavigatedTo(NavigationEventArgs e)
{
ViewModel = new VMAccount(Global.Client.CurrentPerson.Customer);
}
}
VMAccount:
public class VMAccount : VMBase, IEditableObject
{
public VMAccount(Customer customer)
{
Customer = customer;
}
private Customer m_oCustomer;
public Customer Customer
{
get { return m_oCustomer; }
set
{
if (m_oCustomer != value)
{
m_oCustomer = value;
OnPropertyChanged("Customer");
}
}
}
public event EventHandler<AsyncResultArgs> SaveCustomerSuccess;
public event EventHandler<AsyncResultArgs> SaveCustomerFailure;
#region IEditableObject Members
public void BeginEdit()
{
Customer.PropertyChanged += new PropertyChangedEventHandler(OnCustomerPropertyChanged);
Customer.ContactInfo.PropertyChanged += new PropertyChangedEventHandler(OnCustomerPropertyChanged);
}
public void CancelEdit()
{
(Customer as IRevertibleChangeTracking).RejectChanges();
(Customer.ContactInfo as IRevertibleChangeTracking).RejectChanges();
}
public void EndEdit()
{
if (Customer.HasChanges)
{
Global.Client.MainContext.SubmitChanges((lo) =>
{
HandleResult("Save Customer", lo, true, SaveCustomerSuccess, SaveCustomerFailure);
}, null);
}
}
#endregion
private void OnCustomerPropertyChanged(object sender, PropertyChangedEventArgs e)
{
OnPropertyChanged("Customer");
}
}
VMBase:
public class VMBase : INotifyPropertyChanged
{
protected virtual void OnPropertyChanged(string property)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
}
我放入'OnCustomerPropertyChanged'事件处理程序,看看我是否可以强制数据表来确认Customer属性已更改,但它没有任何区别,即使事件正在触发。我已经尝试删除IEditableObject以确认这是问题...
public class VMAccount : VMBase//, IEditableObject
...
感谢您的帮助。
编辑:我应该补充一点,客户是RIA实体
答案 0 :(得分:0)
因此事实证明我正在尝试编辑嵌套对象,在RIA工具包SP1发布之前无法完成。感谢。
答案 1 :(得分:0)
在问题Silverlight 3 Dataform Commit Button not activating
中,您的问题可能类似我使用silverlight 4和RIA serivces也有同样的想法。
我决定安装WCF RIA 服务包1和 重新安装WCF RIA服务 WCF RIA Services SP1的工具包。
这两个安装程序可以在以下位置找到: http://www.silverlight.net/getstarted/riaservices/
直接链接到WCF RIA Services SP 1: http://go.microsoft.com/fwlink/?LinkId=205085 直接链接到WCF RIA服务 WCF RIA Services SP1的工具包: http://go.microsoft.com/fwlink/?LinkID=205088