轉自:https://www.cnblogs.com/tianqing/p/6865046.html
上篇博文中,我們介紹了Azure Event Hub的一些基本概念和架構:
Azure Event Hub 技術研究系列1-Event Hub入門篇
本篇文章中,我們繼續深入研究,瞭解Azure Event Hub的創建、編程SDK,實現將事件發送到雲端的Azure Event Hub。
一、Azure Portal中創建Event Hub
創建一個新的Event Hub:
將連接字符串拷貝出來,備用。
二、通過Event Hub的SDK將事件發送到Event Hub
新建一個Console工程:EventHubSend
添加Nuget:
Microsoft.Azure.EventHubs
添加關鍵引用:
using Microsoft.Azure.EventHubs; using System.Text; using System.Threading.Tasks;
添加常量作爲事件中心連接字符串和實體路徑(單個事件中心名稱)
private static EventHubClient eventHubClient; private const string EhConnectionString = "{Event Hubs connection string}"; //第一步拷貝的連接字符串 private const string EhEntityPath = "{Event Hub path/name}"; //MyEventHub
新加MainAsync函數
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(); }
將100個事件消息發送到EventHub方法:SendEvents
/// <summary> /// 創建100個消息事件,異步發送到EventHub /// </summary> /// <param name="count">個數</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函數中添加:
static void Main(string[] args)
{
MainAsync(args).GetAwaiter().GetResult();
}
Run:
發現錯誤了:The messaging entity 'sb://myeventhubtest.servicebus.chinacloudapi.cn/MyEventHub' could not be found.
MyEventHub這個是我們在代碼中指定的。
private const string EhEntityPath = "MyEventHub"; //MyEventHub
這個是否需要在Azure Portal中提前創建好?
再次Run:
這次可以了。