Question

我是Xamarin的新手。我对Xamarin表单中的ListView有疑问。每次我在listView中选项卡（或选择）时，如何知道哪一行或哪个索引？下面是我尝试过的代码，但e.SelectedItem没有显示任何内容。谢谢你的帮助。

listView.ItemSelected += async (sender, e) => {

    if (e.SelectedItem == null) return; // don't do anything if we just de-selected the row

    await DisplayAlert("Tapped", e.SelectedItem + " row was selected", "OK");

    ((ListView)sender).SelectedItem = null; // de-select the row
};

Answer 1

我有一个列表视图，点击后我必须转到详细信息视图页面。以下是我用于相同的代码。

listView.ItemSelected += async (sender, e) =>
            {
                if (e.SelectedItem == null)
                {
                    // don't do anything if we just de-selected the row
                    return;
                }
                else
                {
                    Resource resource = e.SelectedItem as Resource;
                    listView.SelectedItem = null;
                    await Navigation.PushAsync(new ResourceDetails(resource));
                }
            };

在你的情况下，我会修改代码如下：

listView.ItemSelected += async (sender, e) => {

    if (e.SelectedItem == null) return; // don't do anything if we just de-selected the row

    await DisplayAlert("Tapped", (e.SelectedItem as YourDataType).Name + " row was selected", "OK");

    ((ListView)sender).SelectedItem = null; // de-select the row
};

Answer 2

我找到了解决方法如何找到行的索引。：）

listView.ItemSelected += async (sender, e) => {
                if (e.SelectedItem == null) return; // don't do anything if we just de-selected the row
                Person person = (Person)e.SelectedItem;
                int index = -1;

                for(int i = 0; i < people.Count; i++)
                {
                    if(people[i] == person)
                    {
                        index = i;
                        break;
                    }
                }

                await DisplayAlert("Tapped", person.Name + " row was selected " + index.ToString(), "OK");

                ((ListView)sender).SelectedItem = null; // de-select the row
            };

Answer 3

更简单快捷的解决方案是在ItemSource上使用IndexOf - 在您的情况下＆＃34;人员＆＃34;

int index = people.IndexOf(person);

这将删除你的for循环

如何知道在ListView Xamarin表单中点击或选择了哪一行

3 个答案: