Linq Lambda Where子句在where子句中

问题是Enumerable.Where返回,IEnumarable但谓词Where预期boolen.您可以使用Any代替: -

var x = AccountSummeriesResponse.items
           .Where(wp => wp.webProperties.Any(p => p.profiles.Any(a => a.id == profile )))
           .FirstOrDefault();

此外,您可以像这样替换Where with FirstOrDefault: -

 var x = AccountSummeriesResponse.items
         .FirstOrDefault(wp => wp.webProperties.Any(p => p.profiles
                                               .Any(a => a.id == profile )));