将 JSON 数据路由到 Azure 中的事件中心

Question

我有一种情况，我需要通过事件中心将 JSON 数据（一个 JSON 文件，而不是转换为 JSON）发送到时序见解。但由于缺乏 C# 经验，我无法发送数据。

我可以发送其他示例消息，但不能发送 JSON。我该怎么做？

任何帮助或见解将不胜感激。

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;
using System.IO;
using Microsoft.ServiceBus.Messaging;

namespace ConsoleApp5
{
    class Program
    {
        static string _connectionString = "Endpoint..;

        static async Task MainAsync(string[] args)
        {
            var client = EventHubClient.CreateFromConnectionString(_connectionString, "eventhub");
            var json = File.ReadAllText(@"C:\Users\Shyam\Downloads\personal.json");
            var eventData = new EventData(Encoding.UTF8.GetBytes(json));
            await EventHubClient.SendAsync(eventData);

        }
    }
}

但它会在异步方法中引发错误。

严重性代码描述项目文件行抑制状态 错误 CS0120 非静态字段、方法或属性“EventHubClient.SendAsync(EventData)”需要对象引用 ConsoleApp5 C:\Users\Shyam\source\repos\ConsoleApp5\ConsoleApp5\Program.cs 21 Active

更新：

namespace jsonData
{
    using System;
    using System.Text;
    using System.IO;
    using System.Threading.Tasks;
    using Microsoft.Azure.EventHubs;

    public class Program
    {
        private static EventHubClient eventHubClient;
        private const string EhConnectionString = "Endpoint=sb://";
        private const string EhEntityPath = "hub";

        public static void Main(string[] args)
        {
            MainAsync(args).GetAwaiter().GetResult();
        }

        private static async Task MainAsync(string[] args)
        {
            // Creates an EventHubsConnectionStringBuilder object from the connection string, and sets the EntityPath.
            // Typically, the connection string should have the entity path in it, but this simple scenario
            // uses the connection string from the namespace.
            var connectionStringBuilder = new EventHubsConnectionStringBuilder(EhConnectionString)
            {
                EntityPath = EhEntityPath
            };

            eventHubClient = EventHubClient.CreateFromConnectionString(connectionStringBuilder.ToString());

            var json = File.ReadAllText(@"D:\Sample.json");
            var eventData = new EventData(Encoding.UTF8.GetBytes(json));
            await eventHubClient.SendAsync(eventData);

            await eventHubClient.CloseAsync();


            Console.WriteLine("Press ENTER to exit.");
            Console.ReadLine();
        }
    }
}

Answer 1

将您的事件包装到 JSON 数组中：

using (var ms = new MemoryStream())
using (var sw = new StreamWriter(ms))
{
    // Wrap events into JSON array:
    sw.Write("[");
    for (int i = 0; i < events.Count; ++i)
    {
        if (i > 0)
        {
            sw.Write(',');
        }
        sw.Write(events[i]);
    }
    sw.Write("]");

    sw.Flush();
    ms.Position = 0;

    // Send JSON to event hub.
    EventData eventData = new EventData(ms);
    eventHubClient.Send(eventData);
}

参考：docs.microsoft.com/time-series-insights-send-events

Answer 2

我相信您现在已经弄清楚了，但您的问题不在于 JSON，而在于您使用事件中心客户端的方式。

代替这一行：

await EventHubClient.SendAsync(eventData);

应该是这样的：

await client.SendAsync(eventData);

Answer 3

JSON 只是事件中心的一个字符串，所以很简单

var json = File.ReadAllText("myfile.json");
var eventData = new EventData(Encoding.UTF8.GetBytes(json));
await eventHubClient.SendAsync(eventData);