c# - 按一个或多个参数进行过滤

Question

我有 List<Book> Books

public class Book
{
    public string Name { get; set; }
    public string Author { get; set; }
    public string Category { get; set; }
    public string Language { get; set; }
    public DateTime Publication_date { get; set; }
    public string ISBN { get; set; }
}

试过了，但只有在所有参数都匹配时才有效

foreach (var item in Books)
{
    if ((!string.IsNullOrEmpty(name) && item.Name == name) 
      && (!string.IsNullOrEmpty(author) && item.Author == author) 
      && (!string.IsNullOrEmpty(category) && item.Category == category)
      && (!string.IsNullOrEmpty(language) && item.Language == language) 
      && (Publication_date.HasValue && item.Publication_date == Publication_date) 
      && (!string.IsNullOrEmpty(ISBN) && item.ISBN == ISBN))
    {
        Console.WriteLine(item);
    }
}

如何通过一个或多个参数进行过滤？就像我只输入“名称”和“语言”一样，它会向我打印两个参数都匹配的书(如果字符串为空或为空，则应跳过参数)
谢谢)

Answer 1

逻辑有点复杂，但通过使用 continue 变得更简单.

foreach (var item in Books)
{
    if (!string.IsNullOrEmpty(name) && item.Name != name) continue;
    if (!string.IsNullOrEmpty(author) && item.Author != author) continue;
    if (!string.IsNullOrEmpty(category) && item.Category != category) continue;
    if (!string.IsNullOrEmpty(language) && item.Language != language) continue;
    if (Publication_date.HasValue  && item.Publication_Date != Publication_Date) continue;
    if (!string.IsNullOrEmpty(ISBN) && item.ISBN!= ISBN) continue;

    Console.WriteLine(item);
}