我需要在列表视图中默认设置一些项目,我这样做是listpicker加载的事件 . 这很好用,接下来当用户更改这些选择时,我无法检索结果.SelectionChanged事件在listpicker加载事件之前被触发,如果我在加载的方法中添加事件处理程序,从XAML中删除它,我得到了异常
System.Windows.ni.dll中出现未处理的“System.InvalidOperationException”类型异常
这是我的代码..
private void interestms_Loaded(object sender, RoutedEventArgs e)
{
//selectedinterests is a string containing keys of selected interests seperated by commas.
object[] split1 = selectedinterests.Split(',');
//interest is a dictionary with total list of interests
var s = PhoneApplicationService.Current.State["interest"];
List<object> finallist = new List<object>();
var ss = (((System.Collections.Generic.Dictionary<string, string>)(s))).Keys;
List<object> arr = new List<object>((((System.Collections.Generic.Dictionary<string, string>)(s))).Values);
for (int k = 0; k < split1.Length; k++)
{
object getsel = arr[k];
finallist.Add(getsel);
}
interestms.SelectedItems = hello;
}
在selectionChange事件中,我获取已单击的项目,而不是已检查的项目,因此当取消选中已选中项目时,该项目也会添加到selectedItems中 . 在这种情况下,我需要创建两个对象数组,一个包含整个值集和其他所选项,并删除两者中的公共项 . 这样做,在加载事件之前调用selectionChanged方法 .
请帮助 . 如果需要任何其他细节,我很乐意提供..
编辑:
private void interestms_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//edited interst is an array object
editedinterests.Add(e.AddedItems);
var s = PhoneApplicationService.Current.State["interest"];
List<object> arr = new List<object>((((System.Collections.Generic.Dictionary<string, string>)(s))).Values);
var listcommon = arr.Intersect(editedinterests);
}
1 回答
试试这个