声明类型缺少部分修饰符错误

Question

我是新来的表达混合。在开发桌面应用程序时，我收到一个错误，提示“在声明类型中缺少部分修饰符”，但我已将partial关键字置于public和class之间进行了更正。更正它后，我得到了下面的错误，我会感激你，如果你能好心给妥善解决这些错误

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)

代码：

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

要解决第一个错误，请添加此类成员:(只需在任何方法外部将其声明在顶部）

Point st artPoint = Point.Empty;

Point startPoint = new Point(); 

第二个错误是更棘手..从我所看到的，IndexFromContainer方法返回整数，但假设listViewItem是Contact类型的已经，尝试改变行：

Contact contact = (Contact)listViewItem; 

看起来你错过了Contact类的定义..找不到任何标准，但我想你是指这个类？

public class Contact 
{ 
    public Contact() 
    { 
    } 

    public string Name 
    { 
     get; 
     set; 
    } 

    public string Email 
    { 
     get; 
     set; 
    } 

    public string PhoneNumber 
    { 
     get; 
     set; 
    } 
}