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我正在通过SQFlite获取数据。为什么我必须显式地将输出类型为string '${cardUser.firstname.toString().substring(0, 1).toUpperCase()}',,而在整个类中,我使用String声明。如果我删除这个toString(),它会给我一个NoSuchMethodError。然而,在ListView标题和副标题中,它显示的数据很好。
The following NoSuchMethodError was thrown building:
The method 'substring' was called o