上篇博文中,咱们介绍了Azure Event Hub的一些基本概念和架构:html
Azure Event Hub 技术研究系列1-Event Hub入门篇编程
本篇文章中,咱们继续深刻研究,了解Azure Event Hub的建立、编程SDK,实现将事件发送到云端的Azure Event Hub。api
1、Azure Portal中建立Event Hub架构
建立一个新的Event Hub:异步
将链接字符串拷贝出来,备用。async
2、经过Event Hub的SDK将事件发送到Event Hub函数
新建一个Console工程:EventHubSendpost
添加Nuget:ui
Microsoft.Azure.EventHubsspa
添加关键引用:
using Microsoft.Azure.EventHubs; using System.Text; using System.Threading.Tasks;
添加常量做为事件中心链接字符串和实体路径(单个事件中心名称)
private static EventHubClient eventHubClient; private const string EhConnectionString = "{Event Hubs connection string}"; //第一步拷贝的链接字符串 private const string EhEntityPath = "{Event Hub path/name}"; //MyEventHub
新加MainAsync函数
private static async Task MainAsync(string[] args) { var connectionStringBuilder = new EventHubsConnectionStringBuilder(EhConnectionString) { EntityPath = EhEntityPath }; eventHubClient = EventHubClient.CreateFromConnectionString(connectionStringBuilder.ToString()); await SendEvents(100); await eventHubClient.CloseAsync(); Console.WriteLine("Press ENTER to exit."); Console.ReadLine(); }
将100个事件消息发送到EventHub方法:SendEvents
/// <summary> /// 建立100个消息事件,异步发送到EventHub /// </summary> /// <param name="count">个数</param> /// <returns></returns> private static async Task SendEvents(int count) { for (var i = 0; i < count; i++) { try { var eventEntity = $"Event {i}"; Console.WriteLine($"Sending Event: {eventEntity}"); await eventHubClient.SendAsync(new EventData(Encoding.UTF8.GetBytes(eventEntity))); } catch (Exception exception) { Console.WriteLine($"{DateTime.Now} > Exception: {exception.Message}"); } await Task.Delay(10); } Console.WriteLine($"{count} messages sent."); }
在Main函数中添加:
static void Main(string[] args)
{
MainAsync(args).GetAwaiter().GetResult();
}
Run:
发现错误了:The messaging entity 'sb://myeventhubtest.servicebus.chinacloudapi.cn/MyEventHub' could not be found.
MyEventHub这个是咱们在代码中指定的。
private const string EhEntityPath = "MyEventHub"; //MyEventHub
这个是否须要在Azure Portal中提早建立好?
再次Run:
此次能够了。
周国庆
2017/5/17