如何通过列表中的属性值获取/查找对象

我有一个关于通过使用 LINQ“搜索”字段名称来获取列表对象的问题。我编码简单Library and Book为此类：

class Book
{
    public string title { get; private set; }
    public string author { get; private set; }
    public DateTime indexdate { get; private set; }
    public int page { get; private set; }

    public Book(string title,string author, int page)
    {
        this.title = title;
        this.author = author;
        this.page = page;
        this.indexdate = DateTime.Now;
    }
}

class Library
{
    List<Book> books = new List<Book>();

    public void Add(Book book)
    {
        books.Add(book);
    }

    public Book GetBookByAuthor(string search)
    {
        // What to do over here?
    }
}

所以我想得到Book某些字段等于某些字符串的实例，例如

if(Book[i].Author == "George R.R. Martin") return Book[i];

我知道使用简单的循环代码是可能的，但我想使用 LINQ 来做到这一点。有什么办法可以实现这一点吗？

var myBooks = books.Where(book => book.author == "George R.R. Martin");

并记得添加：using System.Linq;

在您的特定方法中，因为您只想返回one书，你应该写：

public Book GetBookByAuthor(string search)
{
    var book = books.Where(book => book.author == search).FirstOrDefault();
    // or simply:
    // var book = books.FirstOrDefault(book => book.author == search);
    return book;
}

The Where https://msdn.microsoft.com/library/bb549418%28v=vs.100%29.aspx返回一个IEnumerable<Book>，那么FirstOrDefault https://msdn.microsoft.com/en-us/library/bb340482%28v=vs.110%29.aspx返回在可枚举或中找到的第一本书null如果没有找到人。