WPF C＃通過ListView選擇項循環

Question

我有一個列表視圖，並需要循環選擇的項目集合。但我得到一個錯誤下面是我的代碼：

DataRowView drv; 
foreach(var current in lstValue.SelectedItems) 
{ 
     ListBoxItem li = new ListBoxItem(); 
     drv = current as DataRowView; 
     li.Content = Criteria + "=" + drv["CODE"]; 
     lstSelection.Items.Add(li); 
} 

我得到的錯誤對象引用未設置爲對象的實例。這是堆在流鏈路我已經擡頭

C# WPF - Get the selected items from a ListView

Answer 1

您應該檢查：

if(lstValue != null) 
{ 
    foreach(var current in lstValue.SelectedItems) 
    { 
     // Your code 
    } 
} 

Answer 2

DataRowView drv; 
foreach(var current in lstValue.SelectedItems) 
{ 
    ListBoxItem li = new ListBoxItem(); 
    drv = current as DataRowView; 
    if (drv != null) 
    { 
     li.Content = Criteria + "=" + drv["CODE"]; 
     lstSelection.Items.Add(li); 
    } 
}