SunlightAggregationTerminal/QueryDetail.xaml.cs

using SunlightAggregationTerminal.Models;
using System.Collections.ObjectModel;

namespace SunlightAggregationTerminal;

public partial class QueryDetail : ContentPage
{
    public static ObservableCollection<DyelotDetailsItem> QueryDetailDyelotDetailsItems { get; set; } = new();
    public static ObservableCollection<DyelotDetailsItem> QueryDetailDyelotDetailsItemst { get; set; } = new();
    public QueryDetail(DyelotItem item)
	{
        

        InitializeComponent();

        QueryDetailDyelotDetailsItems.Add(new DyelotDetailsItem
        {
            Dyelot = "2134566",
            Machine = "g01",
            Step="3",
            CreationTime = "",
            DispenserGram="32434",
            Gram = "3212",
            ReDye = "0",
            ProductName="sdvsf1",
            Information = "yyjjy\nfxfxdsdg\n",
        });
        QueryDetailDyelotDetailsItems.Add(new DyelotDetailsItem
        {
            Dyelot = "2134566",
            Machine = "g01",
            Step = "3",
            CreationTime = "",
            DispenserGram = "32423434",
            Gram = "3212434",
            ReDye = "0",
            ProductName = "sdvsf2",
            Information = "yyjjy\nfxfxdsdg\n",
        });
        QueryDetailDyelotDetailsItems.Add(new DyelotDetailsItem
        {
            Dyelot = "2134566",
            Machine = "g01",
            CreationTime = "",
            DispenserGram = "3212434",
            Gram= "3212434",
            Step = "4",
            ReDye = "0",
            ProductName = "sdvsf3",
            Information = "yyjjy\nfxfxdsdg\n",
        });

        Data_();

        
    }

    private void Data_() 
    {

        var processedList = QueryDetailDyelotDetailsItems
            .GroupBy(item => new
            {
                // 建议加上 ?.Trim() 防止空格和 null 导致的分组偏差
                Dyelot = item.Dyelot?.Trim(),
                Step = item.Step?.Trim()
            })
            .Select(g =>
            {
                var firstItem = g.First();
                // 提取该组内所有的 ProductName 并转为字符串
                // 提取该组内所有的 Gram，安全地转为字符串（防止 null 报错）
                // 将两者用 Zip 方法一一配对，拼接成 "ProductName(Gram)" 的格式
                // 如果只想简单的全部堆在一起，也可以直接用 string.Join(",", productNames.Concat(grams))                
                var productNames = g.Select(x => x.ProductName);                 
                var grams = g.Select(x => x.Gram?.ToString());                
                var dispenserGrams = g.Select(x => x.DispenserGram?.ToString());
                // 使用 Zip 将三者一一配对，拼接成 "名称(Gram/dispenserGram)" 的格式                
                var combinedInfo = string.Join("\n",productNames.Zip(grams, (name, gram) => (name, gram)) // 先把前两个拼成元组                               
                    .Zip(dispenserGrams, (pair, dispGram) => $"原料:{pair.name}\n目标用量:{pair.gram}g\n实际用量:{dispGram}g"));

                // 赋值给最终展示的 ProductName
                firstItem.ProductName = combinedInfo;
                return firstItem;
            })
            .ToList(); // 强制立刻执行查询

        // 更新 UI 绑定的 ObservableCollection
        QueryDetailDyelotDetailsItems.Clear();
        foreach (var item in processedList)
        {
            QueryDetailDyelotDetailsItems.Add(item);
        }
        CardCollectionView_data.ItemsSource = QueryDetailDyelotDetailsItems;
    }
}