聲明類型缺少部分修飾符錯誤

Question

我是新來的表達混合。在開發桌面應用程序時，我收到一個錯誤，提示「在聲明類型中缺少部分修飾符」，但我已將partial關鍵字置於public和class之間進行了更正。更正它後，我得到了下面的錯誤，我會感激你，如果你能好心給妥善解決這些錯誤

The name 'startPoint' does not exist in the current context 
C:\Documents and Settings\acer\Desktop\my inter\rrrr\dragDrop(test1)\dragDrop(test1)\Window1.xaml.cs 24 9 dragDrop(test1)

The type or namespace name 'contact' could not be found (are you missing a using directive or an assembly reference?) 
C:\Documents and Settings\acer\Desktop\my inter\rrrr\dragDrop(test1)\dragDrop(test1)\Window1.xaml.cs 67 32 dragDrop(test1)

The type or namespace name 'Contact' could not be found (are you missing a using directive or an assembly reference?) 
C:\Documents and Settings\acer\Desktop\my inter\rrrr\dragDrop(test1)\dragDrop(test1)\Window1.xaml.cs 67 13 dragDrop(test1)

代碼：

private void List_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
{ 
    startPoint = e.GetPosition(null); 
} 

private void List_MouseMove(object sender, MouseEventArgs e) 
{ 
    Vector diff = startPoint - mousePos; 
    Contact contact = (contact)listView.ItemContainerGenerator.IndexFromContainer(listViewItem); 
    DataObject dragData = new DataObject("myFormat", contact); 
} 

private void DropList_Drop(object sender, DragEventArgs e) 
{ 
    listView.Items.Add(contact); 
} 

Answer 1

要解決第一個錯誤，請添加此類成員:(只需在任何方法外部將其聲明在頂部）

Point st artPoint = Point.Empty;

Point startPoint = new Point(); 

第二個錯誤是更棘手..從我所看到的，IndexFromContainer方法返回整數，但假設listViewItem是Contact類型的已經，嘗試改變行：

Contact contact = (Contact)listViewItem; 

看起來你錯過了Contact類的定義..找不到任何標準，但我想你是指這個類？

public class Contact 
{ 
    public Contact() 
    { 
    } 

    public string Name 
    { 
     get; 
     set; 
    } 

    public string Email 
    { 
     get; 
     set; 
    } 

    public string PhoneNumber 
    { 
     get; 
     set; 
    } 
}