将来自 ASP.NET 网络服务的数据绑定到 Xamarin 中的微调器

Question

我目前正在试用 Xamarin Free 并尝试连接我的网络服务 (ASP.NET) 以填充微调器。

我想做的是异步调用服务，然后在返回结果后填充 Spinner。

结果是，只有一个项目被绑定 - 结果数组中的第一个元素。

如有任何建议，我们将不胜感激！

代码如下：

using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using WebServiceTestApplication.ServiceProxy;

namespace WebServiceTestApplication
{
    [Activity (Label = "WebServiceTestApplication", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {

        Tablet_Services proxy; 
        Spinner spCategories;
        ArrayAdapter<string> spCategoriesContent;

        protected override void OnCreate (Bundle bundle)
        {
            base.OnCreate (bundle);
            SetContentView (Resource.Layout.Main);
            proxy  = new ServiceProxy.Tablet_Services();

            spCategoriesContent = new ArrayAdapter<string> (this, Android.Resource.Layout.SimpleSpinnerItem);
            spCategoriesContent.SetDropDownViewResource (Android.Resource.Layout.SimpleSpinnerDropDownItem);

            spCategories = (Spinner)FindViewById (Resource.Id.spCategories);
            spCategories.Adapter = spCategoriesContent;

            UpdateTreatmentCategories ();
        }

        void PopulateResults (srTreatmentCategory[] result)
        { 
            if (result != null) 
            {
                foreach (srTreatmentCategory c in result) 
                {
                    Console.WriteLine ("Adding {0} to spCategoriesContent", c.CategoryName);
                    spCategoriesContent.Add(c.CategoryName);
                }
            }
        }

        public void UpdateTreatmentCategories ()
        {
            proxy.BegingetTreatmentCategories (delegate (IAsyncResult ar) {
                var result = proxy.EndgetTreatmentCategories (ar);
                PopulateResults (result);
            }, null);
        }
    }
}

Answer 1

您正在更新型号列表，但没有更新适配器。尝试用加载的数据更新适配器。

编辑这是最简单的例子。

    void PopulateResults (srTreatmentCategory[] result)
    { 
        if (result != null) 
        {
            foreach (srTreatmentCategory c in result) 
            {
                Console.WriteLine ("Adding {0} to spCategoriesContent", c.CategoryName);
                spCategoriesContent.Add(c.CategoryName);
            }

            spCategoriesContent = new ArrayAdapter<string> (this, Android.Resource.Layout.SimpleSpinnerItem);
            spCategoriesContent.SetDropDownViewResource (Android.Resource.Layout.SimpleSpinnerDropDownItem);
            spCategories.Adapter = spCategoriesContent;
        }
    }

最后你应该考虑用 updateData / swapData 方法编写更多你自己的 Adapter 实现。

Answer 2

对于名为“类别”的下拉列表，这是对我有用的。我认为您通过使用称为 PopulateResults() 的方法走在正确的轨道上，我将其称为 LoadSpinnerData()。

CategorySpinner = dialogView.FindViewById<Spinner>(Resource.Id.spinnerCategory);
CategorySpinner.ItemSelected += spinner_ItemSelected;

private void spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e)
        {
            var spinner = (Spinner)sender;
            SelectedCategory = string.Format("{0}", spinner.GetItemAtPosition(e.Position));
}
private void LoadSpinnerData()
        {
            var tempCategories = (List<ServiceCategory>) CategoryManager.GetCategories();
            var categories = tempCategories.Select(category => category.Name).ToList();

            var categoryAdapter = new ArrayAdapter<string>(
                Activity, Android.Resource.Layout.SimpleSpinnerItem, categories);

            categoryAdapter.SetDropDownViewResource
                (Android.Resource.Layout.SimpleSpinnerDropDownItem);
            CategorySpinner.Adapter = categoryAdapter;
        }

您可以在此处找到整个代码文件https://github.com/valokafor/XamarinAndroidCustomDialog/blob/master/XamarinDroidCustomListView/ServiceDialog.cs

祝 Xamarin 好运

将来自 ASP.NET 网络服务的数据绑定到 Xamarin 中的微调器

Binding data from ASP.NET webservice to a spinner in Xamarin

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xamarin