我正在尝试为我的 View 获取一个不同的列表。我需要从一个列表中随机选择记录并将其放入另一个列表中。以下代码有效..但它包含重复记录..我该如何克服这个问题?
注意:变量“budget”是传递给 Controller 的参数,“model1”是PlanObjectsViewModel的列表
int count = 0;
foreach (var item in model1) { count++; }
List<PlanObjectsViewModel> result = new List<PlanObjectsViewModel>();
Random rand = new Random();
double? temp=0;
while(budget>temp)
{
int randi = rand.Next(0, count);
var nthItem = model1.OrderBy(p => p.Id).Skip(randi).First();
temp += nthItem.Price;
if (!result.Contains(nthItem)) // Think this is the wrong point
{
result.Add(nthItem);
}
}
最佳答案
使用 HashSet<PlanObjectsViewModel>
using System;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main()
{
// Input array that contains three duplicate strings.
string[] array1 = { "cat", "dog", "cat", "leopard", "tiger", "cat" };
// Display the array.
Console.WriteLine(string.Join(",", array1));
// Use HashSet constructor to ensure unique strings.
var hash = new HashSet<string>(array1);
// Convert to array of strings again.
string[] array2 = hash.ToArray();
// Display the resulting array.
Console.WriteLine(string.Join(",", array2));
}
}
输出:
cat,dog,cat,leopard,tiger,cat
cat,dog,leopard,tiger
关于c# - 如何避免列表重复,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30352076/