If there is an error in the processing, an exception is thrown, which is then also formatted as JSON.

如果处理过程中出现错误，将抛出一个异常，这个异常也被格式化为json。

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At first, the logic behind this sounds reasonable: If you change this data element from optional to required, you essentially duplicate error processing that occurs elsewhere in the system.

首先，整个过程背后的逻辑是合理的：如果您将这项数据元素从可选改为必需，那么您基本上就是复制了系统中其他地方所使用的错误处理过程。

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In WCF applications, service methods communicate processing error information by using fault messages.

在WCF程序中，服务方法通过使用出错信息来交流处理的错误。

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