Question

我有一个List<T>，其中T有一个字符串属性，我们称之为Value

然后我有List<string>包含一些关键字。

如何删除List<T>中属性值与List<string>中的一个关键字匹配的所有项目？

Answer 1

使用List<T>.RemoveAll Method (Predicate<T>)，谓词检查关键字列表是否包含值。

示例控制台应用程序：

public static class Program
{
    public class A
    {
        public string Value { get; set; }
    }

    public static void Main(string[] args)
    {
        var keywords = new List<string>() {"A", "B", "C", "D"};

        var aas = new List<A>()
        {
            new A() {Value = "A"},
            new A() {Value = "AA"},
            new A() {Value = "B"},
            new A() {Value = "AB"}
        };

        Console.WriteLine("Before remove:");
        aas.ForEach(a => Console.WriteLine("  A.Value = {0}", a.Value));

        aas.RemoveAll(a => keywords.Contains(a.Value));

        Console.WriteLine("After remove:");
        aas.ForEach(a => Console.WriteLine("  A.Value = {0}", a.Value));
    }
}

输出控制台：

Before remove:
  A.Value = A
  A.Value = AA
  A.Value = B
  A.Value = AB
After remove:
  A.Value = AA
  A.Value = AB

Answer 2

public class test
{
    public string waarde { get; set; }
}
class Program
{
    static void Main(string[] args)
    {
        var teBeRemoved = new List<string> {"een", "twee"};

        var totalList = new List<test> { new test { waarde = "een" }, new test { waarde = "drie" } };

        var filteredList  = totalList.Where(i => !teBeRemoved.Contains(i.waarde));

    }
}

C＃如果属性在List <string>中，则从List <t>中删除所有项目

2 个答案: