从xml文件读取值并绑定多个控件，控件互相干扰的有关问题

从xml文件读取值并绑定多个控件，控件互相干扰的问题求助
大家好我写了个函数用来从xml文件中读取控件的值，然后绑定。但是奇怪的是，当选择控件comboBoxEx41的值时， comboBoxEx42和comboBoxEx43 也同时变成和 comboBoxEx41 一样了。请问是什么问题呢？
我想让三个控件绑定相同的属性值，操作互不干扰，应该怎么修改呢？谢谢下面是代码：


//从xml文件中绑定控件
            private void update1()
        {
            DataSet ds = new DataSet();            
            string fromPath = System.Environment.CurrentDirectory + @"\conf\rate_group.xml";
            FileInfo xmlFile = new FileInfo(fromPath);
            if (xmlFile.Exists)
            {
                FileStream fsReadxml = new FileStream(fromPath, FileMode.Open);
                XmlTextReader myXmlReader = new XmlTextReader(fsReadxml);
                ds.ReadXml(myXmlReader);                
                myXmlReader.Close();
            } 

            comboBoxEx41.DataSource = ds.Tables[0];
            comboBoxEx41.DisplayMember = "displaymember";
            comboBoxEx41.ValueMember = "valuemember";
            comboBoxEx41.SelectedIndex = -1;
            comboBoxEx41.DropDownStyle = ComboBoxStyle.DropDownList;


            comboBoxEx42.DataSource = ds.Tables[0];
            comboBoxEx42.DisplayMember = "displaymember";
            comboBoxEx42.ValueMember = "valuemember";
            comboBoxEx42.SelectedIndex = -1;
            comboBoxEx42.DropDownStyle = ComboBoxStyle.DropDownList;


            comboBoxEx43.DataSource = ds.Tables[0];
            comboBoxEx43.DisplayMember = "displaymember";
            comboBoxEx43.ValueMember = "valuemember";
            comboBoxEx43.SelectedIndex = -1;
            comboBoxEx43.DropDownStyle = ComboBoxStyle.DropDownList;
}

[解决办法]
加上Copy可以。

测试通过

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.IO;

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

        private void Form1_Load(object sender, EventArgs e)
        {

            DataSet ds = new DataSet(); 
 

            string xml = @"&lt;root&gt;
&lt;item displaymember=""a"" valuemember=""1""&gt;&lt;/item&gt;
&lt;item displaymember=""b"" valuemember=""2""&gt;&lt;/item&gt;
&lt;item displaymember=""c"" valuemember=""3""&gt;&lt;/item&gt;
&lt;/root&gt;";

            MemoryStream stream = new MemoryStream(Encoding.Default.GetBytes(xml));
            XmlTextReader myXmlReader = new XmlTextReader(stream);
            ds.ReadXml(myXmlReader);                
            myXmlReader.Close();
 
            comboBox1.DataSource = ds.Tables[0].Copy();
            comboBox1.DisplayMember = "displaymember";
            comboBox1.ValueMember = "valuemember";
            comboBox1.SelectedIndex = -1;
            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;

            comboBox2.DataSource = ds.Tables[0].Copy();
            comboBox2.DisplayMember = "displaymember";
            comboBox2.ValueMember = "valuemember";
            comboBox2.SelectedIndex = -1;
            comboBox2.DropDownStyle = ComboBoxStyle.DropDownList;


            comboBox3.DataSource = ds.Tables[0].Copy();
            comboBox3.DisplayMember = "displaymember";
            comboBox3.ValueMember = "valuemember";
            comboBox3.SelectedIndex = -1;
            comboBox3.DropDownStyle = ComboBoxStyle.DropDownList;
        }
    }
}

[解决办法]
当多个控件绑定相同数据源时会有联动效应，这是微软的好事。因为很多场景是，你点击datarow，希望有界面显示datarow的详细信息，你更改下拉框选项是希望下面里datagirdview根据你选择的那项刷新

很多人对winform的偏见是‘winform不是wpf，那需要自己写一大堆事件，手动更新数据刷新，同步操作’其实并非如此，winfrom也可以做到不怎么写手动代码，让微软的代码自己去同步刷新去

好了废话就这么多，了解这个你自己就知道该怎么改了：“绑定相同数据源微软会自动同步UI，那么你不想他自动同步UI，就绑到不同的数据源上即可”
[解决办法]
是的，应该 Copy！

从xml文件读取值并绑定多个控件控件

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