Linq查询:无法转换类型IEnumerable< string>将.ToString()更改为(string)的字符串 [英] Linq Query : Cannot convert type IEnumerable<string> to string changing .ToString() to (string)

问题描述

我有一个包含的linq查询

select new Project()
           {                             
               Manager =  list.Employee.Select(x => x.Manager).ToString()
           }).ToList();

这很简单，但我最终并没有得到数据... 我得到System.Linq.Enumerable+WhereSelectListIterator<Flex.Data.Systems,System.String>的经理"的值 所以我以为我会改成(string)而不是.ToString()，但这不起作用

select new Project()
           {                             
               Manager =  (string)list.Employee.Select(x => x.Manager)
           }).ToList();

给我错误消息

无法将类型'System.Collections.Generic.IEnumerable'转换为'string'

解决方案

您希望Manager是什么，一个用逗号分隔的值列表的string还是List<string>/String[]? >

字符串:

Manager =  string.Join(",",list.Employee.Select(x => x.Manager))

收藏:

Manager =   list.Employee.Select(x => x.Manager).ToList()
// or
Manager =   list.Employee.Select(x => x.Manager).ToArray()

I have a linq query that contains

select new Project()
           {                             
               Manager =  list.Employee.Select(x => x.Manager).ToString()
           }).ToList();

This COMPILES, but I don't end up with the data... I get value for "Manager" of System.Linq.Enumerable+WhereSelectListIterator<Flex.Data.Systems,System.String> So I thought I would change to (string) instead of .ToString() but this does not work

select new Project()
           {                             
               Manager =  (string)list.Employee.Select(x => x.Manager)
           }).ToList();

Gives me the error message

Cannot convert type 'System.Collections.Generic.IEnumerable' to 'string'

解决方案

What do you want Manager to be, a string with a comma separated list of values or a List<string>/String[]?

string:

Manager =  string.Join(",",list.Employee.Select(x => x.Manager))

collection:

Manager =   list.Employee.Select(x => x.Manager).ToList()
// or
Manager =   list.Employee.Select(x => x.Manager).ToArray()

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