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我使用的Windows Phone的DataBoundApp模板,在模板中的selectedIndex值從傳遞的MainPage到DetailsPage定義數據上下文...這樣的:如何從一組物品中選擇特定物品?
// When page is navigated to set data context to selected item in list
protected override void OnNavigatedTo(NavigationEventArgs e)
{
string selectedIndex = "";
if (NavigationContext.QueryString.TryGetValue("selectedItem", out selectedIndex))
{
int index = int.Parse(selectedIndex);
DataContext = App.ViewModel.Items[index];
}
}
這是設置的唯一途徑數據上下文或我可以選擇一個具有特定值的項目,例如,我想將數據上下文設置爲具有LineOne =「runtime 7」值的項目...
我該如何設置?
編輯:這些都是視圖模型項目
public void LoadData()
{
// Sample data; replace with real data
this.Items.Add(new ItemViewModel() { LineOne = "runtime one", LineTwo = "Maecenas praesent accumsan bibendum", LineThree = "Facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime two", LineTwo = "Dictumst eleifend facilisi faucibus", LineThree = "Suscipit torquent ultrices vehicula volutpat maecenas praesent accumsan bibendum dictumst eleifend facilisi faucibus" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime three", LineTwo = "Habitant inceptos interdum lobortis", LineThree = "Habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu suscipit torquent" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime four", LineTwo = "Nascetur pharetra placerat pulvinar", LineThree = "Ultrices vehicula volutpat maecenas praesent accumsan bibendum dictumst eleifend facilisi faucibus habitant inceptos" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime five", LineTwo = "Maecenas praesent accumsan bibendum", LineThree = "Maecenas praesent accumsan bibendum dictumst eleifend facilisi faucibus habitant inceptos interdum lobortis nascetur" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime six", LineTwo = "Dictumst eleifend facilisi faucibus", LineThree = "Pharetra placerat pulvinar sagittis senectus sociosqu suscipit torquent ultrices vehicula volutpat maecenas praesent" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime seven", LineTwo = "Habitant inceptos interdum lobortis", LineThree = "Accumsan bibendum dictumst eleifend facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime eight", LineTwo = "Nascetur pharetra placerat pulvinar", LineThree = "Pulvinar sagittis senectus sociosqu suscipit torquent ultrices vehicula volutpat maecenas praesent accumsan bibendum" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime nine", LineTwo = "Maecenas praesent accumsan bibendum", LineThree = "Facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime ten", LineTwo = "Dictumst eleifend facilisi faucibus", LineThree = "Suscipit torquent ultrices vehicula volutpat maecenas praesent accumsan bibendum dictumst eleifend facilisi faucibus" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime eleven", LineTwo = "Habitant inceptos interdum lobortis", LineThree = "Habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu suscipit torquent" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime twelve", LineTwo = "Nascetur pharetra placerat pulvinar", LineThree = "Ultrices vehicula volutpat maecenas praesent accumsan bibendum dictumst eleifend facilisi faucibus habitant inceptos" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime thirteen", LineTwo = "Maecenas praesent accumsan bibendum", LineThree = "Maecenas praesent accumsan bibendum dictumst eleifend facilisi faucibus habitant inceptos interdum lobortis nascetur" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime fourteen", LineTwo = "Dictumst eleifend facilisi faucibus", LineThree = "Pharetra placerat pulvinar sagittis senectus sociosqu suscipit torquent ultrices vehicula volutpat maecenas praesent" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime fifteen", LineTwo = "Habitant inceptos interdum lobortis", LineThree = "Accumsan bibendum dictumst eleifend facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat" });
this.Items.Add(new ItemViewModel() { LineOne = "runtime sixteen", LineTwo = "Nascetur pharetra placerat pulvinar", LineThree = "Pulvinar sagittis senectus sociosqu suscipit torquent ultrices vehicula volutpat maecenas praesent accumsan bibendum" });
this.IsDataLoaded = true;
}
我不希望通過該項目的索引號來設置數據上下文,而是由一個特定的項目值
向我們展示您的數組初始化,即您的'項目集合',這樣我們可以幫助您更好地編寫它。代碼之後的問題與標題不一樣,這是什麼問題? – 2012-04-25 16:42:01
對不起,如果我不夠清楚 - 我想選擇具有LineOne =「運行時七」屬性的物品... – 2012-04-25 16:47:20
我不熟悉WP7,LineOne也是WP7的東西,或者你能在代碼示例中提供更多細節? – 2012-04-25 16:48:41