如何立即验证 Silverlight 3 Datagrid 中新插入的行? [英] How do I Immediately Validate a Newly Inserted Row in a Silverlight 3 Datagrid?

问题描述

我有一个带有自定义 DataGrid 用户控件的 Silverlight 3 工具库.此网格无法直接访问 WCF RIA 服务实体类型，因此当用户在网格为空时单击该网格时，我使用反射来添加新项目:

I have a Silverlight 3 tools library with a custom DataGrid user control. This grid has no direct access to the WCF RIA Services entity types so I'm using reflection to add a new item when the user clicks on the grid when it's empty:

private void InsertEmptyRecord()
{
    if (this._dataGrid.ItemsSource == null)
        return;

    Type[] typeParameters = this._dataGrid.ItemsSource.GetType().GetGenericArguments();
    if (typeParameters.Count() > 0)
    {
        Type itemType = typeParameters[0];
        object newItem = System.Activator.CreateInstance(itemType);

        Type sourceType = typeof(System.Windows.Ria.EntityCollection<>);
        Type genericType = sourceType.MakeGenericType(itemType);
        System.Reflection.MethodInfo addMethod = genericType.GetMethod("Add");
        addMethod.Invoke(this._dataGrid.ItemsSource, new object[] { newItem });

        // == Validate data here ==
    }
}

这有效，但我还需要在添加新项目后对其进行验证.我可以看到有两种方法可以做到这一点:

This works, but I need it to also validate after the new item is added. There are two ways I can see to do this:

1. 强制用户进入编辑模式对于新行的第一个单元格网格.(这将迫使如果他们点击任何地方进行验证其他在页面上.)
2. 强制验证当新行出现时立即运行添加(或当网格松动时重点.)

我无法让其中任何一个工作.试过这个，但它只选择行，不强制验证运行:

I haven't been able to get either of these to work. Tried this but it only selects the row, doesn't force the validations to run:

this._dataGrid.SelectedItem = newItem;
System.ComponentModel.IEditableObject editableItem = newItem as System.ComponentModel.IEditableObject;
if (editableItem != null)
    editableItem.BeginEdit();

有什么建议吗?

推荐答案

在 这个问题.

我在上面代码的== Validate data here =="部分添加了以下内容:

I added the following to the "== Validate data here ==" section in the code from above:

DataGridRow newRow = this._dataGrid.ChildrenOfType<DataGridRow>().FirstOrDefault();
if (newRow != null)
{
    newRow.Loaded += (sender, e) =>
    {
        this._dataGrid.CurrentItem = newItem;
        this._dataGrid.BeginEdit();
    };
}

这会强制第一个单元格立即进入编辑模式.

This forces the first cell to immediately go into edit mode.

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