Question

我有一个绑定到数据表的C＃ToolStripComboBox，当我更改Selection（事件）时，我尝试获取SelectedValue，并且错误消息显示该属性是DataRowView，当我将其转换为DataRowView时，错误消息说我无法从Int32转换为DataRowView。我能怎么做？感谢

Answer 1

这对我来说很好用

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            DataTable dt = new DataTable();

            DataColumn dc1 = new DataColumn("id", typeof(System.Int32));
            DataColumn dc2 = new DataColumn("desc", typeof(System.String));

            dt.Columns.Add(dc1);
            dt.Columns.Add(dc2);

            for (int i = 0; i < 5; i++)
            {
                DataRow dr = dt.NewRow();
                dr["id"] = i;
                dr["desc"] = i.ToString() + " desc";

                dt.Rows.Add(dr);
            }


            toolStripComboBox1.ComboBox.SelectedIndexChanged += ComboBox_SelectedIndexChanged;

            toolStripComboBox1.ComboBox.SelectionChangeCommitted += ComboBox_SelectionChangeCommitted;

            toolStripComboBox1.ComboBox.ValueMember = "id";
            toolStripComboBox1.ComboBox.DisplayMember = "desc";
            toolStripComboBox1.ComboBox.DataSource = dt;


        }

        private void ComboBox_SelectionChangeCommitted(object sender, EventArgs e)
        {
            //throw new NotImplementedException();
            int v = Int32.Parse(((DataRowView)toolStripComboBox1.ComboBox.SelectedItem)["id"].ToString());

            MessageBox.Show("User Selected " + v.ToString());
        }

        private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {

            //this line will give you the 


        }

        private void toolStripComboBox1_Click(object sender, EventArgs e)
        {

        }
    }
}

我无法将ToolStripComboBox SelectedValue转换为Int32 C＃

1 个答案: