C#选择列表中的元素作为字符串列表
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C# Select elements in list as List of string
提问by Ram
In C# i need to get all values of a particular property from an object list into list of string
在 C# 中，我需要将特定属性的所有值从对象列表中获取到字符串列表中
List<Employee> emplist = new List<Employee>()
{
new Employee{ EID=10, Ename="John"},
new Employee{ EID=11, Ename="Adam"},
new Employee{ EID=12, Ename="Ram"}
};
List<string> empnames = emplist.//get all Enames in 'emplist' object into list
//using linq or list functions or IENumerable functions
I am familiar with the foreach method to extract the value but I want to know if \ how its possible use linq or IENumerable functionsor some shorter code to extract values from the list object property values into a string object.
我熟悉用于提取值的 foreach 方法，但我想知道它是否可以使用 linq 或 IENumerable 函数或一些较短的代码从列表对象属性值中提取值到字符串对象中。
My query is Similar to C# select elements from IListbut i want the the result as list of string
我的查询类似于C# 从 IList 中选择元素，但我希望结果为字符串列表
采纳答案by Adam Houldsworth
List<string> empnames = emplist.Select(e => e.Ename).ToList();
This is an example of Projection in Linq. Followed by a ToListto resolve the IEnumerable<string>into a List<string>.
这是Linq 中的投影示例。后跟 aToList解析IEnumerable<string>成 a List<string>。
Alternatively in Linq syntax (head compiled):
或者在 Linq 语法中（头部编译）：
var empnamesEnum = from emp in emplist
select emp.Ename;
List<string> empnames = empnamesEnum.ToList();
Projection is basically representing the current type of the enumerable as a new type. You can project to anonymous types, another known type by calling constructors etc, or an enumerable of one of the properties (as in your case).
投影基本上是将可枚举的当前类型表示为一种新类型。您可以通过调用构造函数等来投影到匿名类型、另一种已知类型或其中一个属性的枚举（如您的情况）。
For example, you can project an enumerable of Employeeto an enumerable of Tuple<int, string>like so:
例如，您可以Employee将一个可枚举项投影到一个可枚举项，Tuple<int, string>如下所示：
var tuples = emplist.Select(e => new Tuple<int, string>(e.EID, e.Ename));
回答by Strillo
List<string> empnames = (from e in emplist select e.Enaame).ToList();
Or
或者
string[] empnames = (from e in emplist select e.Enaame).ToArray();
Etc...
等等...
