Xamarin表格中的OData连接

时间:2014-10-16 19:27:35

标签: xamarin odata xamarin.forms

我的代码崩溃并在模拟器上出现以下错误。它尝试在 GetDataFromOdataService ()方法中运行try块并抛出错误并发出警报。我正在使用Xamarin.Form

using Simple.OData.Client;
using System.Threading.Tasks;

      private ODataClient mODataClient;

   protected async override void OnAppearing ()
    {
        base.OnAppearing ();
        await InitializeDataService ();
        await GetDataFromOdataService();
    }

     public async Task <bool> InitializeDataService(){

            try {
                mODataClient = new ODataClient ("http://services.odata.org/Northwind/Northwind.svc/");

            }

            catch {
                await DisplayAlert("Error", "Connection Error", "OK", "Cancel");
                System.Diagnostics.Debug.WriteLine("ERROR!");

            }
            return true;
        }

    public async Task<bool> GetDataFromOdataService (){

            try {

                myCustomers= await mODataClient.For("Customers").Top(10).FindEntriesAsync();

            }

            catch {
                await DisplayAlert("Error", "Connection Error", "OK", "Cancel");
                System.Diagnostics.Debug.WriteLine("ERROR!");

            }

            return true;
        }

enter image description here

1 个答案:

答案 0 :(得分:1)

夫妻问题: -

在构造函数中它正在执行var list = new ListView(),它在本地约束它而不是设置类级别范围变量。因此将其调整为list = new ListView()

另一方面,在GetTheData函数中,项目来源被分配为list.ItemsSource = myList;,需要更改为list.ItemsSource = Customers;

我已将zip文件重新打包并发送给您。如果这对您有用,请告诉我?您现在应该能够在 ListView 中看到所有客户。