我怎样才能使它,当我点击一个按钮在form2上,它会影响一个richtextbox在form1 (c#) Winform
本文关键字:一个 影响 richtextbox form1 Winform form2 按钮 | 更新日期: 2023-09-27 18:07:13
我有一个WinForms应用程序。我想能够按下form2上的按钮,然后反映在form1上的richtextbox上。
例如,如果form2上的按钮被编码为在点击时输入"Hello",那么我希望"Hello"文本出现在form1的richtextbox上。
我该怎么做呢?我在网上找过了,但是什么也找不到。
Form1
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Text;
using System.Drawing.Printing;
using System.Diagnostics;
namespace Basic_Word_Processor_Version1._0._0
{
public partial class Form1 : Form
{
public Form1()
{
Instance = this;
}
private string filepath = null;
private int checkPrint;
代码 public static Form1 Instance { get; private set; }
// You still need this like in the first scenario.
public RichTextBox RichTextBox1 { get { return richTextBoxPrintCtrl1; } }
// This constructor should already exist. Just add the one line to it.
}
对此
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Basic_Word_Processor_Version1._0._0
{
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}
Form1.Instance.richTextBoxPrintCtrl1.Text = "";
}
public partial class Form1 : Form
{
public static Form1 Instance { get; private set; }
public RichTextBox RichTextBox1 { get { return richTextBoxPrintCtrl1; } }
public Form1()
{
InitializeComponent();
Instance = this;
}
}
您可以通过属性公开控件。假设在form2中有对form1的引用:
在form1:public RichTextBox PrintCtrl1 { get { return richTextBoxPrintCtrl1; } }
在form2: form1.PrintCtrl1.Text = "Howdy from form2.";
更新:如果在form2中没有对form1的引用,也可以通过静态属性
公开form1的实例:在form1:public static Form1 Instance { get; private set; }
// You still need this like in the first scenario.
public RichTextBox PrintCtrl1 { get { return richTextBoxPrintCtrl1; } }
// This constructor should already exist. Just add the one line to it.
public Form1()
{
Instance = this;
}
然后在form2中,你要这样做,而不是我上面展示的:
Form1.Instance.PrintCtrl1.Text = "Howdy from form2.";
你的Form1类现在看起来像这样(加上你添加的任何东西):
public partial class Form1 : Form
{
public static Form1 Instance { get; private set; }
public RichTextBox PrintCtrl1 { get { return richTextBoxPrintCtrl1; } }
public Form1()
{
InitializeComponent();
Instance = this;
}
}
你的Form3类应该是这样的:
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}
protected void button1_Click(object sender, EventArgs e)
{
Form1.Instance.PrintCtrl1.Text = "";
}
}
我知道在这个页面上已经有一个公认的答案,是的,虽然答案会"工作",但它有两个原因。首先,养成使用静态来获得事物可见性的习惯是一个非常不好的习惯,并且在不必要的情况下使用它会违反OOP编程的概念。其次,通过使用公共静态表单实例,您已经使第二个表单不可重用。它只能与第一个表单交互。更好的方法是使用事件来促进表单之间的通信。下面的代码示例演示了如何做到这一点。
中Form1:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
//Declare your new form
Form2 form2 = new Form2();
//Register the event
form2.changeTextEvent += new EventHandler<TextChangedEventArgs> (form2_changeTextEvent);
//Show your new form
form2.ShowDialog();
}
//Handler for the event from form 2
void form2_changeTextEvent(object sender, TextChangedEventArgs e)
{
//Sets the text of this form equal to the text in our custom event args
//Just a simple example of doing something with the event arg
this.Text = e.Text;
}
}
Form2:
public partial class Form2 : Form
{
//Declare your event
public event EventHandler<TextChangedEventArgs> changeTextEvent;
private String newText = "Custom events FTW!!!";
public Form2()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
//If the event is registered fire it, otherwise do nothing
if (changeTextEvent != null)
{
//fire the event and give our custom event args some text
changeTextEvent(sender, new TextChangedEventArgs(newText));
}
}
}
自定义事件参数:
public class TextChangedEventArgs : EventArgs
{
private String text;
//Did not implement a "Set" so that the only way to give it the Text value is in
//the constructor
public String Text
{
get { return text; }
}
public TextChangedEventArgs(String theText)
: base()
{
text = theText;
}
}
通过这种方式实现,Form2现在是完全可重用的,并且可以在任何注册事件的控件/表单中触发事件。不同的表单可能以不同的方式对事件做出反应,但form2永远不需要改变。