EF中Unable to create a constant value of type...的错误解决
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出现此错误的原因是因为在进行查询之类的操作中，未使用基本数据类型
举个栗子
td.translations.Where(t => t.textinfo == ti).Count()
错误，此处使用了实体外键textinfo而非其id，EF的查询运算只能用int,string之类的基本数据类型
可以修改为：
td.translations.Where(t => t.textinfo.Id == ti.Id).Count()
使用数据类型为int的主键Id进行计算
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