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

发布：2023/3/20 22:37:07作者：管理员来源：本站浏览次数：244

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);

};

以上就是无法从“System.ReadOnlyMemory<byte>”转换为“byte[]”的介绍，做此记录，如有帮助，欢迎点赞关注收藏！

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