在 2 个表单之间传递变量，多线程 C#

Question

我有 2 个表格：Form1 和 Form2。

Form1 包含一个按钮，用于调用 Form2 并在另一个线程上运行它。

Form2 包含 3 个复选框。当用户点击添加按钮时，它会生成一个字符串。

我的问题是如何将字符串传递给 Form1，然后将其添加到 Richtextbox？

谢谢。

Form1

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;
using System.Threading;

namespace PassingData2Forms
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void call_form_2()
        {
            for (int i = 0; i<10; i++) { 
            Form2 inst_form2 = new Form2();
            inst_form2.ShowDialog();
            }
        }

        private void f1_but_01_Click(object sender, EventArgs e)
        {
            Thread extra_thread_01 = new Thread(() => call_form_2());
            extra_thread_01.Start();            
        }
    }
}

Form2

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 PassingData2Forms
{

    public partial class Form2 : Form
    { 
        public Form2()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Close();
        }

        private string clean_string(string process_string)
        {
            process_string = process_string.Replace(",,", ",");
            process_string = process_string.Trim(new char[] {','});
            return process_string;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string[] selected_array = new string[3];

            if (checkBox1.Checked == true)
            {
                selected_array[0] = "Summer";
            }

            if (checkBox2.Checked == true)
            {
                selected_array[1] = "Spring";
            }

            if (checkBox3.Checked == true)
            {
                selected_array[2] = "Fall";
            }

            string selected_string = clean_string(string.Join(",", selected_array));

            //---------------------------------------------------------------
            // How can I pass "selected_string" to RichTextBox in Form1 here?
            //---------------------------------------------------------------

            Close();
        }
    }
}

Answer 1

您可以将事件添加到以这种方式声明的 Form2 类中

public delegate void onMessageReady(string message);
public event onMessageReady MessageReady;

当您的 Form2 有消息准备好发送回有兴趣了解它的客户时，调用 MessageReady 事件

private void button1_Click(object sender, EventArgs e)
{
    .....
    string selected_string = clean_string(string.Join(",", selected_array));
    if(MessageReady != null) 
         MessageReady(selected_string);
    .....
}

最后一步是在构建 Form2 的实例时从 Form1 订阅事件

private void call_form_2()
{
    for (int i = 0; i<10; i++) { 
    Form2 inst_form2 = new Form2();
    inst_form2.MessageReady += MessageReceived;
    inst_form2.ShowDialog();
    }
}
private void MessageReceived(string message)
{
        if (form1RichTextBox.InvokeRequired)
           form1RichTextBox.Invoke(new Form2.onMessageReady(messageReady), new object[] {message});
        else
           form1RichTextBox.AppendText(message + Environment.NewLine);
}