Question

当我尝试使用CSList作为WPF DataGrid的ItemsSource时，我收到错误

无法将'System.Object []'类型的对象强制转换为'Product []'

我不完全确定可以将它用作绑定源，但根据vici coolstorage几乎不存在的文档，它们的集合应该适合绑定。这是看起来失败的线：

dataGrid1.ItemsSource = Product.List();

有人能告诉我这是否可能，如果是，我做错了什么？

谢谢！

[EDIT]这是堆栈跟踪（略有改动）

  at Vici.CoolStorage.CSList`1.System.Collections.ICollection.CopyTo(Array array, Int32 index) in {...}\Vici.CoolStorage\Library\CSListGeneric.cs:line 1070
   at System.Collections.ArrayList.InsertRange(Int32 index, ICollection c)
   at System.Collections.ArrayList.AddRange(ICollection c)
   at System.Collections.ArrayList..ctor(ICollection c)
   at System.Windows.Data.BindingListCollectionView.RebuildListsCore()
   at System.Windows.Data.BindingListCollectionView.RebuildLists()
   at System.Windows.Data.BindingListCollectionView.<SubscribeToChanges>b__1f()
   at MS.Internal.Data.SynchronizationInfo.AccessCollection(IEnumerable collection, Action accessMethod, Boolean writeAccess)
   at System.Windows.Data.BindingOperations.AccessCollection(IEnumerable collection, Action accessMethod, Boolean writeAccess)
   at System.Windows.Data.BindingListCollectionView.SubscribeToChanges()
   at System.Windows.Data.BindingListCollectionView..ctor(IBindingList list)
   at MS.Internal.Data.ViewManager.GetViewRecord(Object collection, CollectionViewSource cvs, Type collectionViewType, Boolean createView, Func`2 GetSourceItem)
   at MS.Internal.Data.DataBindEngine.GetViewRecord(Object collection, CollectionViewSource key, Type collectionViewType, Boolean createView, Func`2 GetSourceItem)
   at System.Windows.Data.CollectionViewSource.GetDefaultCollectionView(Object source, Boolean createView, Func`2 GetSourceItem)
   at System.Windows.Data.CollectionViewSource.GetDefaultCollectionView(Object source, DependencyObject d, Func`2 GetSourceItem)
   at System.Windows.Controls.ItemCollection.SetItemsSource(IEnumerable value, Func`2 GetSourceItem)
   at System.Windows.Controls.ItemsControl.OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at System.Windows.Controls.ItemsControl.set_ItemsSource(IEnumerable value)
   at {...}.ViewProduct..ctor() in {...}\ViewProduct.xaml.cs:line 37
   at {...}.MainWindow..ctor() in {...}\MainWindow.xaml.cs:line 26

Answer 1

虽然这不是问题的解决方案，但它是一种解决方法。根据帖子here：

应该接受Object []数组的ICollection.CopyTo方法，但不要，因为他们想要调用强类型的CopyTo方法

该论坛中的OP通过绑定到其类型集合的显式创建的数组副本来解决该问题。

而不是

TestCollection c = new TestCollection();
c.Add(new Test());
comboBox1.DataSource = c;
comboBox1.DisplayMember = "Text";

他用

TestCollection c = new TestCollection();
c.Add(new Test());
Test[] arr = new Test[c.Count];
c.CopyTo(arr);
comboBox1.DataSource = arr;
comboBox1.DisplayMember = "Text";

我希望有一个解决方案，不需要麻烦的解决方法，但与此同时，这至少让我解决了问题（有点打破了ORM的一些功能，但是......）

与vici coolstorage CSList绑定的WPF Datagrid会导致强制转换错误

1 个答案: