.Net 中的 Simple.OData.Client

Question

我正在使用将调用 OData 服务的应用程序。我尝试了 Simple.OData.Client，但无法正常工作..

这是我尝试的代码

var client = new ODataClient("http://packages.nuget.org/v1/FeedService.svc/");
var packages = await client.FindEntriesAsync("Packages?$filter=Title eq 'Simple.OData.Client'");
foreach (var package in packages)
{
    Console.WriteLine(package["Title"]);
 }

我收到此错误

错误 1 ​​'await' 运算符只能在异步方法中使用。考虑使用 'async' 修饰符标记此方法并将其返回类型更改为 'Task'。

Answer 1

using System;
using Simple.OData.Client;

namespace ODataClient
{
    class Program
    {
        static void Main(string[] args)
        {   
            new Manager().GetData();    
            Console.ReadLine();
        }
    }
}


using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace ODataClient
{
    public class Manager
    {
        private readonly Simple.OData.Client.ODataClient client;

        public Manager()
        {
            client = new Simple.OData.Client.ODataClient("http://packages.nuget.org/v1/FeedService.svc/");
        }

        public void GetData()
        {
            try
            {
                IEnumerable<IDictionary<string, object>> response = GetPackages().Result;

                foreach (var package in response)
                {
                    Console.WriteLine(package["Title"]);
                }

            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

        private async Task<IEnumerable<IDictionary<string, object>>> GetPackages()
        {
            var packages = await client.FindEntriesAsync("Packages?$filter=Title eq 'Simple.OData.Client'");    
            return packages;

        }
    }
}

Answer 2

这更简单。我们需要 SimpleQuery 方法，因为我们不能将 async 关键字添加到 Main 或任何入口点方法。

    static async void SimpleQuery()
    {
        var client = new ODataClient("http://blahb...lah.svc/");
        try
        {
            var packages = await client.FindEntriesAsync("Products");
            foreach (var package in packages)
            {
                Console.WriteLine(package);
            }
        } catch (Exception e)
        {
            Console.WriteLine("Simple Query " + e);
        }
    }
    static void Main(string[] args)
    {
        Console.WriteLine("Press Enter when the job is completed");
        SimpleQuery();
        Console.ReadLine();
    }