Xamarin XAML ListView-如何以编程方式选择 [英] Xamarin XAML ListView - How to select programmatically

问题描述

我正在使用Xamarin开发Windows Mobile应用程序，但似乎无法以编程方式设置所选的ListView项.

I am developing a windows mobile application with Xamarin, but don't seem to be able to programmatically set the selected ListView item.

我尝试了以下ListViews方法，但仍然没有任何操作

I have tried the following ListViews methods and still nothing

SelectedItem
ScrollTo()
Focus()

我也用谷歌搜索，似乎没什么可说的. 我该怎么办?

I have also googled it and can't seem anything to say how to do this. How do I do this?

推荐答案

在我的示例应用程序中，该方法工作正常:

This works fine in my sample app:

public partial class ItemsPage : ContentPage
{
    public ItemsPage()
    {
        InitializeComponent();
        Vm = new ItemsViewModel();
        BindingContext = Vm;
    }

    protected override void OnAppearing()
    {
        ListviewItems.SelectedItem = Vm.Items[1];
    }

    public ItemsViewModel Vm { get; private set; }

在我的示例应用程序中，ItemsViewModel.Items是List<string>.

In my sample app, ItemsViewModel.Items is a List<string>.

此行代码在OnAppearing中运行后，将选择列表中的第二项.

The second item in the list is set selected after this line of code runs in OnAppearing.

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