修改其他类中的变量 [英] Modifying variables in other classes

问题描述

我真的不知道我在做什么，我看到数百个论坛上有类似的帖子，涉及访问其他形式和类等，但是我不知道他们在说什么.我对汇编器和C没问题，但是我不懂C# 然而.我想做的是拥有一个函数或类"，在文本框中更改文本的值.  似乎很简单，但是无论我怎么键入它，都会出现一些错误，这些错误在Google上进行搜索进一步困扰了我.甚至 如果有人因为之前已经做过某事而不想回答这个问题，我将不胜感激，这只手为我指明了正确的方向！

I really don't know what I'm doing and I see hundreds of forums with similar posts involving accessing other forms and classes and whatnot, however I have no idea what they are talking about.  I am okay at assembler and C, but I don't understand C# yet.  What I'm trying to do is have a function or "class," change the value of the text in a textbox.  Seems simple enough, however no matter  how I type this, I get some error which searching for on Google baffles me further.  Even if someone isn't going to answer this question because it's been done before or something, I would really appreciate a hand pointing me the right direction!

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

        private void send_button_Click(object sender, EventArgs e)
        {
            TextBuffer.ShowText(send_box.Text);
            send_box.Text = String.Empty;
            recv_box.Text = TextBuffer.Text;
        }
    }
    public class TextBuffer
    {
        object stuff;
        public static string Text;
        public static bool ShowText(string TextForAppending)
        {
            TextBuffer.Text += TextForAppending;
            TextBuffer.Text += Environment.NewLine;
            return true;
        }
    }
}

这是我当前的代码，使用GUI创建表单时，空白页几乎没有修改.我在表单的顶部有一个大文本框，"recv_box"  和一个小的"send_box"按钮"send_button"旁边. 我让send_button将文本发送到TextBuffer，然后让它将TextBuffer的内容写入recv_box.  如果我手动声明

This is my current code, barely modified from the blank page when you use the GUI to create a form.  I have a large text box in the top part of the form, "recv_box"  and a small one "send_box" beside a button "send_button." I have the send_button send the text to TextBuffer, and then have it write the contents of TextBuffer to recv_box.  If I manually state

recv_box.Text = TextBuffer.Text;

然后它可以工作，但是我不希望按钮更新框，我希望TextBuffer可以更新屏幕，所以我尝试将这一行放入TextBuffer类中，但它不起作用.我尝试写作

then it works, but I don't want the button to update the box, I want TextBuffer to update the screen, so I tried puting this line in the TextBuffer class and it didn't work.  I tried writing

Form1.recv_box.Text = TextBuffer.Text;

无济于事.  在Form1内部，我尝试了一种方法"  可以，但是在那也不行.  我想做的事情很简单，而且我知道如何在汇编器中做到这一点，但是我不知道如何在C#中做到这一点！

to no avail.  Inside Form1 I tried making a "method"  which does it, but it doesn't work there either.  What I'm trying to do is so simple, and I know how I could do it in assembler, but I just have no idea how to do it in C#!

我们将不胜感激！谢谢！

Help would be appreciated! Thank you!

推荐答案

您想让该类更改文本框的值吗?在您的类中，您必须将Form1的实例传递给它.例如:

You want to have the class changing the value of a textbox? In your class you must pass the instance of Form1 to it. For example:

namespace Texter
{
    public partial class Form1 : Form
    {
        private TextBuffer textBuffer = new TextBuffer(this);

        public Form1()
        {
            InitializeComponent();
        }

        private void send_button_Click(object sender, EventArgs e)
        {
            TextBuffer.ShowText(send_box.Text);
            send_box.Text = String.Empty;
            recv_box.Text = TextBuffer.Text;
        }
    }
    public class TextBuffer
    {
        object stuff;
        public static string Text;
        private Form form;
        
        public TextBuffer(Form form)
        {
          this.form = form;
        }

        public static bool ShowText(string TextForAppending)
        {
            form.recv_box.Text += TextForAppending;
            form.recv_box.Text += Environment.NewLine;
            return true;
        }
    }
}

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