Question

采取以下计划：

using System;
using System.Collections.Generic;
using System.Linq;

class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }
}

class Program
{
    static void Main()
    {
        var records = new Person[]
        {
            new Person{ FirstName = "John", LastName = "Doe", Age = 32 },
            new Person{ FirstName = "Jane", LastName = "Doe", Age = 27 },
            new Person{ FirstName = "Joe", LastName = "College", Age = 28 }
        };

        Console.WriteLine(string.Join(", ", records.Select(r => new
        {
            FullName = r.FirstName + " " + r.LastName
        })));
    }
}

预期输出是：

John Doe, Jane Doe, Joe College

但实际输出是：

{ FullName = John Doe }, { FullName = Jane Doe }, { FullName = Joe College }

是否可以从<{1}}内部解析？

这是我最近遇到的一个更大问题的简化，我需要在WriteLine内解决这个问题，因为我在查询中执行此“序列化”;我不能执行多个语句。

Answer 1

而不是选择匿名类型：

records.Select(r =>  r.FirstName + " " + r.LastName)

所以你的Console.WriteLine可能是：

Console.WriteLine(string.Join(", ", records.Select(r => r.FirstName + " " + r.LastName)));

Answer 2

试试这个，

Console.WriteLine(string.Join(", ", records.Select(r => String.Format("{0} {1}", r.FirstName, r.LastName) ));

Answer 3

您正在重新创建动态对象。我认为你的意思是这样的：

    Console.WriteLine(string.Join(", ", records.Select(r => r.FirstName + " " + r.LastName)));

Answer 4

使用内联lambda表达式如下：

Console.WriteLine(string.Join(", ", records.Select(r => r.FirstName + " " + r.LastName));

Answer 5

我建议使用ToString（）方法。这使得方法更加清洁。

public class Person {
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }
    public override string ToString() {
        return string.Format("{0} {1}", FirstName, LastName);
    }
}

然后

Console.WriteLine(string.Join(", ", records.Select(r => r.ToString())));

序列化对象数组属性值

5 个答案: