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您好我已經通過遵循教程在Silverlight中創建了示例數據庫應用程序。我試圖在數據庫中插入一條記錄，但它會引發錯誤提交操作失敗驗證。請檢查EntitiesInError中Entity.ValidationErrors以獲取更多信息。我正在使用DAL的實體框架。我的代碼如下。插入記錄時發生異常。但Iam不確定在哪個階段發生異常。 RecordInsertPage.cs文件Silverlight 4 RIA服務問題
public partial class BookRegistaeration : ChildWindow
{
public Book newBook { get; set; }
public BookRegistaeration()
{
InitializeComponent();
newBook = new Book();
AddBookForm.CurrentItem =AddBookForm;
AddBookForm.BeginEdit();
}
private void OKButton_Click(object sender, RoutedEventArgs e)
{
AddBookForm.CommitEdit();
this.DialogResult = true;
}
private void CancelButton_Click(object sender, RoutedEventArgs e)
{
newBook = null;
AddBookForm.CancelEdit();
this.DialogResult = false;
}
}
Service.cs頁
public class OrganizationService : LinqToEntitiesDomainService<LibraryEntities1>
{
public IQueryable<Book> GetBooks()
{
return this.ObjectContext.Books.OrderBy(e => e.BookId);
}
public void InsertBook(Book book)
{
//book.Title = "Hello book";
//book.Author = "Ali";
//book.Category = "Humanity";
if ((book.EntityState != EntityState.Detached))
{
this.ObjectContext.ObjectStateManager.ChangeObjectState(book, EntityState.Added);
}
else
{
this.ObjectContext.Books.AddObject(book);
}
}
public void UpdateBook(Book currentBook)
{
this.ObjectContext.Books.AttachAsModified(currentBook, this.ChangeSet.GetOriginal(currentBook));
}
public void DeleteBook(Book book)
{
if ((book.EntityState != EntityState.Detached))
{
this.ObjectContext.ObjectStateManager.ChangeObjectState(book, EntityState.Deleted);
}
else
{
this.ObjectContext.Books.Attach(book);
this.ObjectContext.Books.DeleteObject(book);
}
}
}
private void LibraryDataSource_SubmittedChanges(object sender, SubmittedChangesEventArgs e)
{
if (e.HasError)
{
MessageBox.Show(string.Format("Changes were not saved: {0}", e.Error.Message));
e.MarkErrorAsHandled();
}
submitButton.IsEnabled = true;
}
void addBook_Closed(object sender, EventArgs e)
{
BookRegistaeration book = (BookRegistaeration)sender;
if (book.newBook != null)
{
OrganizationContext _OrganizationContext = (OrganizationContext)(LibraryDataSource.DomainContext);
_OrganizationContext.Books.Add(book.newBook);
LibraryDataSource.SubmitChanges();
}
}