小编Sow*_*mya的帖子

您好我想使用谓词表达式基于搜索字符串创建列表.

我有一个类型产品列表包含不同的名称.

List<products> list1 = new List<products>();

        list1.Add(new products("sowmya"));
        list1.Add(new products("Jane"));
        list1.Add(new products("John"));
        list1.Add(new products("kumar"));
        list1.Add(new products("ramya"));
        listBox1.ItemsSource = list1;

现在我想根据用户输入过滤内容.用户将输入n个字符串,并带有'+'作为分隔符.收到字符串后,我会将它们传递给谓词对象

 private void textBox1_KeyDown(object sender, KeyEventArgs e)
    {
        List<products> list2 = new List<products>();
        Expression<Func<products, bool>> predicate = PredicateBuilder.True<products>();
        if (e.Key == Key.Enter)
        {
            string Searchstring = textBox1.Text.ToString().Trim();
            string[] separator = new string[] { "+" };
            string[] SearchItems=Searchstring.Split(separator,StringSplitOptions.None);
            foreach (string str in SearchItems)
            {
                string temp = str;
                predicate =p => p.Name.Contains(temp.ToLower());                   
            }

            list2 = list1.AsQueryable().Where(predicate).ToList();
            listBox1.ItemsSource = list2;
        }
    } …