无法从“System.ReadOnlyMemory＜byte＞”转换为“byte[]”

GoodTime

发布于 2024-03-05 15:51:28

880

发布于 2024-03-05 15:51:28

1、问题复现

RabbitMQ的官方示例：RabbitMQ消费端(接收端)获取消息时抛出异常，具体代码如下

var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
    var body = ea.Body;
    var message = Encoding.UTF8.GetString(body); // <------错误点
    Console.WriteLine(" [x] Received {0}", message);
};

2、解决办法

查看定义可以看到Encoding.UTF8.GetString重载的方法有多个，参数为字节数组或其指针或只读的字节跨度。

RabbitMQ更新API的地址：https://github.com/rabbitmq/rabbitmq-dotnet-client/commit/8bf93082fd2c18bbd6adff260d38a6fd34d6840b

接下来说下解决办法

① ToArrary()

示例是之前的示例，现在官方示例已更正，最新示例地址：https://www.rabbitmq.com/tutorials/tutorial-one-dotnet.html

var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
    var body = ea.Body.ToArray(); // 将内存区域的内容复制到一个新的数组中
    var message = Encoding.UTF8.GetString(body);
    Console.WriteLine(" [x] Received {0}", message);
};

② Span

var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
    var body = ea.Body.Span; // 从内存区域获取一个跨度
    var message = Encoding.UTF8.GetString(body);
    Console.WriteLine(" [x] Received {0}", message);
};