将文本框字符串从一种形式发送到另一种形式的列表框 [英] Sending a textbox string from one form to a listbox in another form
问题描述
我在下面上传了我的代码.我面临的问题是尝试从textBox1&中获取文本.将form2中的textBox2插入到form1中的listBox中.当用户打开第二个表单时，他们应将文本放入文本框，然后单击按钮-它应关闭form2并将文本插入到form1的listBox
I have uploaded my code below. The problem I am facing is trying to get the text from the textBox1 & textBox2 in form2 into the listBox in form1. When the user opens the 2nd form, they should place text into the textboxes and upon clicking the button - it should close the form2 and insert the text into form1's listBox
我尝试了多种方法，但似乎无法做到.我对c#编码也很陌生，并且刚刚开始使用Windows窗体，因此，我们将不胜感激.
I have tried multiple things but I can't seem to do it. I am also quite new to c# coding and have just started on windows forms so any help would be much appreciated.
下面的表格1代码
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 ToDoList
{
public partial class Form1 : Form
{
List<string> _items = new List<string>();
public Form1()
{
InitializeComponent();
Form2 form2 = new Form2();
_items.Add("TITLE\t\t\tDESCRIPTION\t\t\t\t\t\tPRIORITY\tDUE DATE");
listBox1.DataSource = _items;
}
private void filesToolStripMenuItem_Click(object sender, EventArgs e)
{
}
private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
Form2 form2 = new Form2();
form2.Show();
}
private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}
public void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
}
public void button2_Click(object sender, EventArgs e)
{
}
public void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
public void listView1_SelectedIndexChanged_1(object sender, EventArgs e)
{
}
private void listBox1_SelectedIndexChanged_1(object sender, EventArgs e)
{
}
}
}
下面的表格2代码
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 ToDoList
{
public partial class Form2 : Form
{
List<string> _items = new List<string>();
public Form2()
{
InitializeComponent();
}
public void button2_Click(object sender, EventArgs e, string tbtext)
{
//Form1 form1 = new Form1();
//form1.listBox1.Items.Add(tbtext);
Form1 form1 = new Form1();
_items.Add(textBox1.Text);
_items.Add(textBox2.Text);
_items.Add(comboBox1.Text);
form1.listBox1.DataSource = null;
form1.listBox1.DataSource = _items;
}
public void button1_Click(object sender, EventArgs e)
{
this.Close();
}
public void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
//IF THE USER DOES NOT ENTER items IN THE SPACES THESE IF STATEMENTS BRING A MESSAGEBOX
if (string.IsNullOrWhiteSpace(this.textBox2.Text) && string.IsNullOrWhiteSpace(this.textBox1.Text))
{
MessageBox.Show("Please Fill The Entries");
}
else
{
if (string.IsNullOrWhiteSpace(this.textBox1.Text))
{
MessageBox.Show("Please Enter A Task Name");
}
if (string.IsNullOrWhiteSpace(this.textBox2.Text))
{
MessageBox.Show("Please Enter A Description");
}
}
}
public void textBox1_TextChanged_1(object sender, EventArgs e)
{
}
public void textBox2_TextChanged(object sender, EventArgs e)
{
}
public void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
}
推荐答案
您的总体思路是正确的，但是您必须了解的是Mark在评论中所说的.在Form2中创建Form1并将数据添加到该表单将不起作用，因为一旦Form2关闭，该Form1的实例将不再存在. IE.您当前正在做的事情看起来像是树状层次结构:
Your general idea is correct, but what you must understand is what Mark stated in comments. Creating Form1 in Form2 and adding data to that form won't work, because once Form2 closes, that instance of Form1 no longer exists. I.E. What you are currently doing looks like this as a tree hierarchy:
Form1 (open Form2)
|
+-> Form2 (open and save to Form1)
|
+-> Form1 (contains saved data but you never see it)
原始Form1是父级.它负责打开Form2.使用ShowDialog，Form1可能知道Form2如何关闭.并且由于它是父窗体，因此它可以访问Form2上的任何公共属性.假设Form2具有以下 public 字段:
The original Form1 is the parent. It is responsible for opening Form2. Using ShowDialog, Form1 may know how Form2 closed. And because it is the parent form, it can access any public properties on Form2. So say Form2 has the following public fields:
public TextBox textBox1;
public TextBox textBox2;
然后您可以像这样从其中检索数据:
You could then retrieve data from these like so:
public void SomeMethodInForm1()
{
Form2 form2 = new Form2();
// Show form2 as a modal dialog and determine if DialogResult = OK.
if (form2.ShowDialog(this) == DialogResult.OK)
{
// Read the contents of form2's TextBox.
this._items.Add(form2.textBox1.Text);
this._items.Add(form2.textBox2.Text);
this.listBox1.DataSource = null;
this.listBox1.DataSource = _items;
}
form2.Dispose();
}
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