基于另一个列表C＃的子元素过滤列表 [英] Filtering list based on child element of another list C#

问题描述

我的结构类似于

i have structure like

public class Categories {
  Public List<categorydescription> LisstOfcategories {get ; set;} 
} 

public class categoryDescription { 
  public string CategoryCode {get ;set;} 
}

我有字符串列表，其中包含一些类别，例如

And i have List of string which contains some categories like

List<string> lst = new List<string>();

lst.Add("CategoryCode1"); 
lst.Add("CategoryCode2");

和List类别为

and List of Categories as

List<Categories > lstCategories Now how do i filter lstCategoriessuch that CategoryCode having same value defined in lst collection should not be selected in Linq C# ? How can i filter this ?

我的尝试：

What I have tried:

i want to query through LINQ, i have tried following which does not compile lstCategories= lstCategories.Where(x => lst.Any(y => y != x.categoryDescription.ForEach(z => z.CategoryCode)));

推荐答案

首先，你的模型（结构）是错误的！



我建议用这种方式创建Category对象：

First of all, your model (structure) is wrong!

I'd suggest to create Category object this way:

public class Category
{
	private string sdescription = string.Empty;
	private string scode = string.Empty;

	public Category(string _description)
	{
		sdescription = _description;
	}
	
	public Category(string _description, string _code)
	{
		sdescription = _description;
		scode = _code;
	}
	
	public string Description
	{
		get { return sdescription; }
		set { sdescription = value; }
	}
	
	public string Code
	{
		get { return scode; }
		set { scode = value; }
	}
}

现在，您的列表可能如下所示：

Now, your list could look like:

List<Category> Categories = new List<Category>()
    {
        new Category("Books", "001"),
        new Category("Cars", "002"),
        new Category("Tools", "003")
    };

另一个类别列表（CategoryCode）：

And another list of categories (CategoryCode):

List<string> lst = new List<string>()
    {
        "Cars",
        "Dogs"
    };

Finall查询：

Finall query:

var CategoriesNotOnLst = Categories
    .Where(x => !lst.Any(z => x.Description==z))
    .ToList();

结果：

Result:

Description Code
Books       001 
Tools       003 

您可以通过以下方式实现：

You can achieve it by following way:

lstCategories.Where(x => lst.Contains(x.CategoryCode));

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