Question

c# listbox选中项在textbox显示并可修改

想点击 listbox中的项时，将其值放到textbox中，再在textbox中修改后点击按钮，则更新listbox中选择项。请问c#代码怎么写。

Answer 1

给LISTBOX添加ONCLICK事件，在这个事件发生时，将这个LISTBOX的SELECTEDITEM的TEXT赋值给TEXTBOX的text,然后，点击这个修改按钮时，触发ONCLICK事件，将LISTBOX的值修改了，然后绑定
我来写代码，你等等，如果上面的思路够用了，那你自己写
<asp:ListBox ID="lbData" runat="server" onselectedindexchanged="lbData_SelectedIndexChanged" AutoPostBack="true">
<asp:ListItem Text="111" Value="1"></asp:ListItem>
<asp:ListItem Text="222" Value="2"></asp:ListItem>
<asp:ListItem Text="333" Value="3"></asp:ListItem></asp:ListBox>
<asp:TextBox ID="txtChange" runat="server"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" Text="Button" onclick="btnSubmit_Click" />

protected void lbData_SelectedIndexChanged(object sender, EventArgs e)
{
this.txtChange.Text= this.lbData.SelectedItem.Text;

}

protected void btnSubmit_Click(object sender, EventArgs e)
{
this.lbData.SelectedItem.Text = txtChange.Text;
}

Answer 2

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if(this.listBox1.SelectedIndex!=-1) //必要
this.textBox1.Text = this.listBox1.SelectedItem.ToString();
}

private void button4_Click(object sender, EventArgs e)
{
this.listBox1.Items[this.listBox1.SelectedIndex] = this.textBox1.Text;
}

Answer 3

没有那么麻烦吧？
int i;
private void listBox1_Click(object sender, EventArgs e)
{
i = this.listBox1.SelectedIndex;
this.textBox1.Text = this.listBox1.SelectedItem.ToString();
}
private void button1_Click(object sender, EventArgs e)
{
this.listBox1.Items[i] = this.textBox1.Text;
}