如何比较清单 [英] how to compare lists

问题描述

使用linq让我知道如何比较2个字符串列表..我只想知道它们是否相等.这两个列表具有相同的值，可以使用Except运算符并检查结果的计数是否为零(如Tarun所指出的，您需要检查两种方法是否相同)，就像这样

列表< string>一个= 新列表< string>(){" ，  b"，  c"};
           List< string>两个= 新列表< string>(){" ，  b"，  c"，  d"};
           // 如果两个值都相同
            if (one.Except(two).Count()==  0 &&两个. (一个).Count()==  0 )
           {
               MessageBox.Show(" )；
           }
           其他
           {
               MessageBox.Show(" );
           }
           // 忽略大小写
           如果(一个.Except(两个，StringComparer.CurrentCultureIgnoreCase).Count()==  0 && ; two.Except(one，StringComparer.CurrentCultureIgnoreCase).Count()==  0 )
           {
               MessageBox.Show(" )；
           }
           其他
           {
               MessageBox.Show(" );
           }
           // 如果一个引用与两个引用相同
           如果(一个等于(两个))
           {
               MessageBox.Show(" )；
           }
           其他
           {
               MessageBox.Show(" )；
           } 

希望这对您有帮助

尝试:

列表< string> ListA = 新 List< string>("  .Split(')));
List< string> ListB = 新列表< string>("  .Split(' ')));
 var 差异= ListA.Where(x = > ！ListB.Any(x1 = >  x1 == x))
.Union(ListB.Where(x = > ！ListA.Any(x1 = >  x1 = = x)))；
如果(differences.Count()！=  0 )
    {
    Console.WriteLine(" );
    }

static void Main(string[] args)
{
    List<string> List1 = new List<string> { "Car", "Home", "City" };
    List<string> List2 = new List<string> { "Car", "Home", "City" };
    List<string> List3 = new List<string> { "Home", "Car", "City" };
    Console.WriteLine(List1.SequenceEqual(List2));//Result is True
    Console.WriteLine(List1.SequenceEqual(List3));//Result is False

    Console.Read();
}

Using linq let me know how to compare 2 list of strings.. i oly want to know whether they are equal

解决方案

By equal I expect you mean whether the two lists have the same values, you can use the Except operator and check whether the result has a count of zero (as pointed out by Tarun, you need to check whether both ways are the same ), something like this

List<string> one = new List<string>() { "a", "b", "c" };
           List<string> two = new List<string>() { "a", "b", "c", "d" };
           //If both have same values
           if (one.Except(two).Count() == 0 && two.Except(one).Count() == 0)
           {
               MessageBox.Show("They have same values");
           }
           else
           {
               MessageBox.Show("They are not same.");
           }
           //To ignore case
           if (one.Except(two, StringComparer.CurrentCultureIgnoreCase).Count() == 0 && two.Except(one, StringComparer.CurrentCultureIgnoreCase).Count() == 0)
           {
               MessageBox.Show("They have same values, igoring case");
           }
           else
           {
               MessageBox.Show("They are not same.");
           }
           //If one is same reference as two
           if (one.Equals(two))
           {
               MessageBox.Show("They are the same reference");
           }
           else
           {
               MessageBox.Show("They are not same reference");
           }

Hope this helps

Try:

List<string> ListA = new List<string>("hello paul this is a text string".Split(' '));
List<string> ListB = new List<string>("hello paul this is a text string again".Split(' '));
var differences = ListA.Where(x => !ListB.Any(x1 => x1 == x))
.Union(ListB.Where(x => !ListA.Any(x1 => x1 == x)));
if (differences.Count() != 0)
    {
    Console.WriteLine("Different!");
    }

static void Main(string[] args)
{
    List<string> List1 = new List<string> { "Car", "Home", "City" };
    List<string> List2 = new List<string> { "Car", "Home", "City" };
    List<string> List3 = new List<string> { "Home", "Car", "City" };
    Console.WriteLine(List1.SequenceEqual(List2));//Result is True
    Console.WriteLine(List1.SequenceEqual(List3));//Result is False

    Console.Read();
}

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