当第一个组合框的选择发生变化时，如何更新secod组合框 [英] how to update the secod combobox when selection of first combobox changes

问题描述

我想更改列表，如果第二个组合框如果第一个组合框选择改变，我有两个组合框首先包含移动公司的名称，如htc三星和诺基亚，我想改变第二个组合框的列表，当第一个组合框选择更改

i已经完成了这个

i want to change the list if second combobox if the first combobox selection changes, i have two combobox first contains the names of mobile companies like htc samsung and nokia, and i want to change the list of second combobox when the first combobox selection changes
i have done this

  string[] st2 = new string[] { "Galaxy S", "Galaxy SII", "Galaxy SIII" };
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            comboBox2.Items.Clear();
            if (comboBox1.SelectedIndex == 1 )
            {
                comboBox2.Items = st2 // this is not happing here what can i do?
            }
        }

推荐答案

string[] samsung = new string[] { "Galaxy S", "Galaxy SII","Galaxy SIII" };
string[] apple = new string[] {"iPhone4", "iPhone4S"};
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            comboBox2.Items.Clear();
            if ("Samsung" == comboBox1.SelectedItem.ToString())
            {
                comboBox2.Items.AddRange(samsung);
            }
            else if("Apple" == comboBox1.SelectedItem.ToString())
            {
                comboBox2.Items.AddRange(apple);
            }
        }

如果它不起作用，请告诉我......

If its not working, let me know...

您需要将字符串添加到Items集合中：如何：添加和删除项目Windows窗体ComboBox，ListBox或CheckedListBox控件 [ ^ ]

You need to add the strings into the Items collection: How to: Add and Remove Items from a Windows Forms ComboBox, ListBox, or CheckedListBox Control[^]

string[] st2 = new string[] { "Galaxy S", "Galaxy SII", "Galaxy SIII" };

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            comboBox2.Items.Clear();
            if (comboBox1.SelectedIndex == 1 )
            {
                foreach( string st in st2 )
                {
                    comboxBox2.Items.Add( st );
                }
            }
        }

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