如何在对象列表中获得组合

本文关键字：组合 列表 对象 | 更新日期: 2023-09-27 18:13:37

我有一个对象列表:

List<classname> mylist=new List<classname>();
public class classname
{
    public String test { set; get; }
    public String name { set; get; }
    public String value{ set; get; }
}

我的列表包含以下值:

test1, name1, value1    
test1, name2, value2    
test2, name1, value1    
test2, name3, value3    
test3, name4, value4

我需要得到组合，其中每个组合都有一个值列表，如

test1, name1, value1
test2, name1, value1
test3, name1, value3

每个组合应该包含test1, test2和test3中的一行

如何在对象列表中获得组合

看起来您想按classname.name分组，在这种情况下，您可以这样做

void Main()
{
    List<classname> mylist=new List<classname>()
    {
        new classname { test = "test1", name = "name1", value = "value1" },
        new classname { test = "test1", name = "name2", value = "value2" },
        new classname { test = "test2", name = "name1", value = "value1" },
        new classname { test = "test2", name = "name1", value = "value3" },
        new classname { test = "test2", name = "name3", value = "value3" },
        new classname { test = "test3", name = "name4", value = "value4" }
    };
    var groups = mylist.GroupBy(x => x.name);
    foreach(var group in groups)
    {
        // name property value
        //Console.WriteLine(group.Key);
        foreach(var row in group)
        {
            // unique rows for this "name" group
            Console.WriteLine($"{row.test} {group.Key} {row.value}");
        }
        Console.WriteLine();
    }
}
public class classname
{
    public String test { set; get; }
    public String name { set; get; }
    public String value{ set; get; }
}
输出:

test1 name1 value1
test2 name1 value1
test2 name1 value3
test1 name2 value2
test2 name3 value3
test3 name4 value4
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