Question

我正在开发一个餐厅应用程序，其中将放置新订单。 Itemtype将在组合框中。并且基于组合框值的选择，结果应该显示在DataGridView中。例如，如果我选择＆＃34; Biryani＆＃34;组合框中的项目，所有Biryani类型的项目都应该显示在DataGridView中。

Answer 1

我可以读到你在谈论DAtaGridView和ComboBox，你必须使用Windows Forms。所以你要做的是调用ComboBox的SelectedIndexChanged事件，然后你可以绑定DataGridView。 e.g

private void ComboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
      ComboBox combo = sender as ComboBox;
          if(combo.SelectedIndex >=0)
          {
              int itemId=Convert.ToInt32(combo.SelectedValue);
              datagridview1.DataSource = somFunction(itemId);
          }
}

Answer 2

据我了解你的问题，你可能会这样做：

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Windows.Forms;

  namespace WindowsFormsApplication1 {
     public partial class Form1 : Form {

        public class Selection {
           public enum eType { None, Indian, Chinese, Italian, British };
           public eType Type { get; private set; }
           public string Name { get; private set; }

           public Selection(eType xType, string xName) {
              Type = xType;
              Name = xName;
           } //

        } // class

        private List<Selection> _AllMeals = new List<Selection>();
        public Form1() {
           InitializeComponent();
           comboBox1.DataSource = Enum.GetValues(typeof(Selection.eType)).Cast<Selection.eType>();
           comboBox1.SelectedItem = Selection.eType.None;

           Selection s1 = new Selection(Selection.eType.Chinese, "tasty Wan Tan soup");
           Selection s2 = new Selection(Selection.eType.Chinese, "yummy Spring Rolls");
           Selection s3 = new Selection(Selection.eType.Indian, "extreme spicy");
           Selection s4 = new Selection(Selection.eType.Indian, "deadly spicy");
           Selection s5 = new Selection(Selection.eType.Italian, "great Tortellini");
           Selection s6 = new Selection(Selection.eType.Italian, "large Pizza");
           Selection s7 = new Selection(Selection.eType.British, "fatty Fish and Chips");

           _AllMeals.AddRange(new Selection[] { s1, s2, s3, s4, s5, s6, s7 });
           dataGridView1.DataSource = _AllMeals;
        } //

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) {
           object o = comboBox1.SelectedItem;
           Selection.eType lFilter = (Selection.eType)o;

           var lOptions = (from x in _AllMeals
                           where x.Type == lFilter
                           select x).ToArray();

           dataGridView1.AutoGenerateColumns = true;
           dataGridView1.DataSource = lOptions;
           dataGridView1.Invalidate();
        } //

     } // class
  } // namespace

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Gridview数据未根据组合框选择的值显示

2 个答案: