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Accepted
Andriy Goliyad
Asked:2020-10-12 02:05:14 +0000 UTC2020-10-12 02:05:14 +0000 UTC

如何创建嵌套的部分类？

  • 772

我有一个包含多个嵌套类的库类：

public class Library
{
class Book { /*Some code*/ }
class Author { /*Somecode*/ }
class Series { /*Somecode*/ }
class Topic { /*Somecode*/ }
}

但是一个文件中有很多代码，所以我决定将 Book、Author、Series、Topic 类移动到单独的文件中。为此，我将它们设为部分。

public class Library
    {
    partial class Book { }
    partial class Author { }
    partial class Series { }
    partial class Topic { }
    }

//Books.cs
partial class Book { /*Some code*/ }
...

但是有一点不行，因为partial class的部分没有一一看到。

c#

1 个回答

  1. Best Answer

    分部类可以嵌套在分部类或非分部类中。在后一种情况下，封闭类必须有一个定义。例如，

    using System;

class Library
{
    public partial class Book
    {
        public string Title { get; set; }
    }

    public partial class Book
    {
        public string Author { get; set; }
    }

    public Book book;
}

public class Test
{
    public static void Main()
    {
        Library lib = new Library 
        { 
            book = new Library.Book { Title = "A good book", Author = "me" } 
        };

        Console.WriteLine( "\"{0}\" is written by {1}", 
                          lib.book.Title, lib.book.Author );
    }
}

    控制台输出

    "A good book" is written by me

    如果您还希望将封闭类与部分嵌套类一起定义在不同的部分，则还必须使用partial.

    例如，

    using System;

partial class Library
{
    public partial class Book
    {
        public string Title { get; set; }
    }
}

partial class Library
{
    public partial class Book
    {
        public string Author { get; set; }
    }
}

partial class Library
{
    public Book book;
}

public class Test
{
    public static void Main()
    {
        Library lib = new Library 
        { 
            book = new Library.Book { Title = "A good book", Author = "me" } 
        };

        Console.WriteLine( "\"{0}\" is written by {1}", 
                          lib.book.Title, lib.book.Author );
    }
}

    控制台输出将与上面显示的相同。

    • 10

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