使用XML序列化的循環引用

Question

我找到了handling circular reference when using xml serialization的解決方案。但是，在我來說，我有一個列表：

public class Category 
{ 
    public Category() 
    { 
     Items = new List<CategoryItem>(); 
    } 

    public string CategoryName { get; set; } 

    public List<CategoryItem> Items { get; set; } 
} 

和：

public class CategoryItem 
{ 

    public string Link { get; set; } 

    public Category Category { get; set; } 
} 

計劃：

private static void Main(string[] args) 
    { 
     var programmingCategory = new Category {CategoryName = "Programming"}; 

     var ciProgramming = new CategoryItem 
     { 
      Link = "www.stackoverflow.com", 
      Category = programmingCategory 
     }; 

     var fooCategory = new CategoryItem 
     { 
      Category = programmingCategory, 
      Link = "www.foo.com" 
     }; 
     programmingCategory.Items.Add(ciProgramming); 
     programmingCategory.Items.Add(fooCategory); 

     var serializer = new XmlSerializer(typeof (Category)); 
     var file = new FileStream(FILENAME, FileMode.Create); 
     serializer.Serialize(file, programmingCategory); 
     file.Close(); 
    } 

我總是得到一個

出現InvalidOperationException

我該如何解決這個問題？

Answer 1

你只需要改變CategoryItem模型

public class CategoryItem 
{ 
    public string Link { get; set; } 
} 

修改這個代碼：

private static void Main(string[] args) 
    { 
     var programmingCategory = new Category {CategoryName = "Programming"}; 

     var ciProgramming = new CategoryItem 
     { 
      Link = "www.stackoverflow.com" 
     }; 

     var fooCategory = new CategoryItem 
     { 
      Link = "www.foo.com" 
     }; 
     programmingCategory.Items.Add(ciProgramming); 
     programmingCategory.Items.Add(fooCategory); 

     var serializer = new XmlSerializer(typeof (Category)); 
     var file = new FileStream(FILENAME, FileMode.Create); 
     serializer.Serialize(file, programmingCategory); 
     file.Close(); 
    } 

我認爲這是工作fine.Please試試這個代碼。我只是改變你的模型，並得到這個輸出。

<?xml version="1.0"?> 

-<Category xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 

<CategoryName>Programming</CategoryName> 


-<Items> 


-<CategoryItem> 

<Link>www.stackoverflow.com</Link> 

</CategoryItem> 


-<CategoryItem> 

<Link>www.foo.com</Link> 

</CategoryItem> 

</Items> 

</Category>