获取一个LongListSelector Item的SelectedIndex [英] Getting the SelectedIndex of a LongListSelector Item

问题描述

我有一个WP8 DataBound应用程序，一个 ItemViewModel 绑定到一个 LongListSelector 。

I have a WP8 DataBound app with an ItemViewModel bound to a LongListSelector.

很简单，当用户点击列表中的一个项目时，我需要检索选择以供将来使用的项目的索引号。 （0是列表中的第一，1是第二个等）

Quite simply, when the user taps on an item in the list, I need to retrieve the index number of the item selected for future use. (0 is first in the list, 1 is second, etc.)

所以，正如这样可能会检索所选项目的某个属性：

So, just as this might retrieve a certain property of the selected item:

string whateverProperty = (MyLongListSelector.SelectedItem as ItemViewModel).WhateverProperty;

我需要这样的东西（显然是编写代码）：

I need something like this (obviously made up code):

int indexNumber = (MyLongListSelector.SelectedItem as ItemViewModel).GetSelectedIndex();

我认为 SelectedIndex 属性是我需要，但我无法弄清楚如何检索。

I think the SelectedIndex property is the thing I need but I can't figure out how retrieve it.

谢谢！

编辑：解决！以下是我正在寻找的东西：

SOLVED! The following gets me exactly what I was looking for:

 int selectedIndex = App.ViewModel.Items.IndexOf(MainLongListSelector.SelectedItem as ItemViewModel);

推荐答案

我也有同样的问题。您需要使用ItemSource来检索索引。它应该匹配您的索引的数据模板索引。

I had the same problem. You need to use the ItemSource to retrieve the index. It should match your data template index for index.

int selectedIndex = selector.ItemsSource.IndexOf(selector.SelectedItem as ItemViewModel);

选择器引用LongListSelector对象发件人。希望这有帮助！

selector references the LongListSelector object sender. Hope this helps!

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