linq 追加Where条件_c# linq 追加条件-优快云博客

本文链接：https://blog.youkuaiyun.com/chadcao/article/details/8293755

本文介绍了一个使用Silverlight进行数据绑定的应用实例，通过创建一个包含学生信息的数据网格，并演示了如何利用LINQ来筛选和排序这些数据。该示例展示了如何在加载页面时动态填充数据网格，并设置多个筛选条件及排序方式。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;


namespace SilverlightApplication90
{
    public partial class MainPage : UserControl
    {
        private DataGrid TestDataGrid = null;
        public MainPage()
        {
            InitializeComponent();
            TestDataGrid = new DataGrid();
            TestDataGrid.AutoGenerateColumns = true;
            LayoutRoot.Children.Add(TestDataGrid);
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
        }


        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            List<Student> allItems = GetAllStudents();
            var query = from s in allItems select s;
            //追加Where条件
            query = query.Where(s => s.StudentID < 10);
            query = query.Where(s => s.StudentName.Contains("1"));
            //排序
            query = query.OrderByDescending(s => s.StudentID);
            TestDataGrid.ItemsSource = query;
        }
        /// <summary>
        /// 获取数据源
        /// </summary>
        /// <returns></returns>
        private List<Student> GetAllStudents()
        {
            List<Student> items = new List<Student>();
            for (int i = 0; i < 20; i++)
            {
                items.Add(new Student(i, "张三" + i));
            }
            return items;
        }
    }
    public class Student
    {
        public Student() { }
        public Student(int _studentID, string _studentName)
        {
            this.StudentID = _studentID;
            this.StudentName = _studentName;
        }
        private int studentID;
        public int StudentID
        {
            get { return studentID; }
            set { studentID = value; }
        }
        private string studentName;
        public string StudentName
        {
            get { return studentName; }
            set { studentName = value; }
        }
    }
}