Linq包含无法推断类型参数

Question

 string[] companyIdsUnfiltered = companyIdsCsv.Split(',');

高于我的代码和我的错误。

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代码如下：

string[] companyIdsUnfiltered = companyIdsCsv.Split(',');
var query = (from c in ctx.Companies
             join co in ctx.Countries on c.CountryId equals co.Id
             where companyIdsUnfilteres.Contains(c.Id)
             select c.Id).ToArray();

Answer 1

鉴于错误，我猜解决方案是将c.Id转换为字符串。

var query = (from c in ctx.Companies
             join co in ctx.Countries on c.CountryId equals co.Id
             where companyIdsUnfilteres.Contains((string) c.Id)
             select c.Id).ToArray();

只是要添加，如果无法转换为string，请尝试c.Id.ToString()。并照顾空值等。