Operator ‘==‘ cannot be applied to operands of type ‘byte[]‘ and ‘string‘

问题提示

Operator '==' cannot be applied to operands of type 'byte[]' and 'string'

原因
后台返回数据是一个byte数组类型，但是判断是否为空的时候却用xxx==""来判断

            if (qrcodeBytes == ""){return null;}

解决办法
将判断改为是否==null即可，因为qrcodeBytes是一个byte数组类型

         if (qrcodeBytes == null){return null;}

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