使用DropDownList中选择的数据填充TextBox1 [英] Populating TextBox1 with data selected in DropDownList

问题描述

如何填充
TextBox1
with the value在
中选择 DropDownList1好吗？

1. 
   

   我双击DropDownList1并发现SelectedIndexChanged是附加到该对象的方法。

   
   

2. 
   

   但是，当我运行网站并更改值时 - 没有任何反应

   
   

3. 
   

   当我添加一个按钮并在按钮中使用相同的代码时，它的工作原理，问题是我需要点击按钮，
   然后页面刷新，这就是什么我想避免。我只想在DropDownList1中更改值时获得相同的效果

   
   

解决方案

您好btsDeveloper，

你需要使用"SelectedIndex"的"SelectedItem"。请查看下面的代码。希望这对你有帮助。

使用System; 
使用System.Windows.Forms; 
 
 namespace ComboBox_To_TextBox 
 {
 public partial class Form1：Form 
 {
 public Form1（）
 {
 InitializeComponent（）; 
} 
 
 private void comboBox1_SelectedIndexChanged（object sender，EventArgs e）
 {
 textBox1.Text = comboBox1.SelectedItem .ToString（）; 
} 
} 
} 
 

输出：

How do I populate a TextBox1 with the value selected in DropDownList1 please ?

1. I double clicked on the DropDownList1 and noticed that SelectedIndexChanged is the method attached to that object.

2. But, when I run the website and change the value - nothing happens

3. When I add a button and use the same code in the button, then it works, the problem is I need to click the button, then the page is refreshing and this is what I want to avoid. I would just like to get the same effect when I change the value in the DropDownList1

解决方案

Hi btsDeveloper,

You need to use "SelectedItem" insted of "SelectedIndex". Please look into the below code. Hope this helps you.

using System;
using System.Windows.Forms;

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

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            textBox1.Text = comboBox1.SelectedItem.ToString();
        }
    }
}

Output:

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