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<!doctype html>
<html class="no-js" lang="en">
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<meta charset="utf-8" />
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<title>
Winform 窗体传值方法总结 - MayGodBlessYou
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<h1>Winform 窗体传值方法总结</h1>
<div class="read-more clearfix">
<span class="date">2014/08/13</span>
<span>posted in </span>
<span class="posted-in"><a href='dotNET.html'>dotNET</a></span>
<span class="comments">
</span>
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<div class="article-content">
<p>窗体传值是在学习窗体应用程序时碰到的一类比较常见的问题，现将窗体传值方法做了一点总结.</p>
<span id="more"></span><!-- more -->
<p>方法如下</p>
<p><strong><1>声明全局变量传值：</strong></p>
<p>在Form1中声明全局变量，如下所示：</p>
<pre><code class="language-plain_text"> public static string str = "窗体1的值";
</code></pre>
<p>通过Form1的button1_Click事件即可将此全局变量传递给Form2，Form1的全局变量str在Form2中可以直接访问，代码如下所示：</p>
<pre><code class="language-plain_text"> private void button1_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
frm2.Show();
}
private void Form2_Load(object sender, EventArgs e)
{
this.label1.Text = Form1.str;
}
</code></pre>
<p><strong><2>通过构造函数传值：</strong></p>
<p>重载Form2的构造函数，使其能够接受一个来自Form1的参数，重载代码如下所示：</p>
<pre><code class="language-plain_text"> private string str;
public Form2(string s)
{
InitializeComponent();
this.str = s;
}
</code></pre>
<p>上面代码中定义的string变量str用来存储从Form1传递进来的参数。<br />
在Form1的button1_Click事件中实例化Form2并给其传递Form1的一个参数，代码如下所示：</p>
<pre><code class="language-plain_text"> private void button1_Click(object sender, EventArgs e)
{
string s = this.textBox1.Text;
Form2 frm2 = new Form2(s);
frm2.Show();
}
</code></pre>
<p>在Form2的Form2_Load中即可接受这个参数，接受这个参数值的代码如下所示：</p>
<pre><code class="language-plain_text"> private void Form2_Load(object sender, EventArgs e)
{
this.label1.Text = str;
}
</code></pre>
<p>这样，在单击Form1的button1之后，Form2便会蹦出来，Form2的label1便会显示这个从Form1传进来的值。</p>
<p><strong><3>在窗体中声明公共属性进行传值：</strong></p>
<p>在Form2中声明公共属性，代码如下所示：<br />
private string username;</p>
<pre><code class="language-plain_text"> public string Username
{
get { return username; }
set { username = value; }
}
private string password;
public string Password
{
get { return password; }
set { password = value; }
}
</code></pre>
<p>这样，在Form1中即可访问这些属性，也就可以将Form2中这些公共属性的值传递给Form1了，并且也可以从Form1中向Form2的这些公共属性传值。代码如下所示：</p>
<p>（1）Form1向Form2传值：</p>
<pre><code class="language-plain_text"> private void button1_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
frm2.Username = "Jack"; //Form1向Form2传值
frm2.Password = "J1234";
frm2.Show();
}
private void Form2_Load(object sender, EventArgs e)
{
textBox1.Text = username;
textBox2.Text = password;
}
</code></pre>
<p>（2）Form2向Form1传值：</p>
<pre><code class="language-plain_text"> private void textBox1_TextChanged(object sender, EventArgs e)
{
this.Username = textBox1.Text;
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
this.Password = textBox1.Text;
}
private void button1_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
frm2.Username = "Jack"; //Form1向Form2传值
frm2.Password = "J1234";
comboBox1.Items.Add(frm2.Username); //Form2向Form1传值
comboBox1.Items.Add(frm2.Password);
frm2.Show();
}
</code></pre>
<p>声明公共属性传值比较灵活，受限较少，因此比较好用。但是或许这会影响数据的安全性哦。</p>
<p><strong><4>传递整个窗体进行传值。</strong></p>
<p>类似于构造函数传值，将窗体作为构造函数的参数即可传递整个窗体了。代码如下所示：</p>
<pre><code class="language-plain_text"> private void button1_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2(this);
f2.Show();
}
Form1 frm1;
public Form2(Form1 f1)
{
InitializeComponent();
this.frm1 = f1;
}
private void Form2_Load(object sender, EventArgs e)
{
this.textBox1.Text = frm1.ActiveControl.ToString();
}
</code></pre>
<p>这样能把Form1整个窗体传递给Form2，在Form2里即可操作Form1的数据及其控件了。</p>
<p><strong><5>更改系统文件：</strong></p>
<p>更改Form1.Designer.cs，譬如要使其控件变为公共可访问的，即找到在此文件中声明的控件，将你需要在Form2里访问的控件的访问修饰符修改为public，如下所示：</p>
<pre><code class="language-plain_text"> private System.Windows.Forms.Button button1;
private System.Windows.Forms.ComboBox comboBox1;
</code></pre>
<p>将上面的代码里需要更改的控件的访问修饰符更改后保存即可。这种方法我个人感觉不好，有违C#语言的封装性和数据的安全性，个人建议不提倡使用。</p>
<p><strong><6>利用委托进行窗体传值：</strong></p>
<p>这种方法是我在网上看到的，对原代码做了一点点改进，利用定义委托和事件以及构造函数的方法，实现了Form1和Form2互相传值。废话不多说，请看代码：<br />
Form1部分的代码：</p>
<pre><code class="language-plain_text">public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str = textBox1.Text;
Form2 f2 = new Form2(str);
f2.Translate += new TranslateEventHandler(f2_Translate);
f2.ShowDialog();
}
void f2_Translate(string value)
{
textBox1.Text = value;
//throw new NotImplementedException();
}
}
</code></pre>
<p>Form2部分的代码：</p>
<pre><code class="language-plain_text"> public delegate void TranslateEventHandler(string value);
public partial class Form2 : Form
{
string str;
public Form2(string s)
{
InitializeComponent();
this.str = s;
}
public event TranslateEventHandler Translate;
private void button1_Click(object sender, EventArgs e)
{
Translate(textBox1.Text);
this.Close();
}
private void Form2_Load(object sender, EventArgs e)
{
this.textBox1.Text = str;
}
}
</code></pre>
<p>Form设计如下图所示：</p>
<p><img src="https://objectstorage.ap-tokyo-1.oraclecloud.com/n/nrql75upzuqs/b/bucket-liberty-blog-20240513/o/jackro_blog2014081301.jpg" alt="jackro_blog2014081301" /> <br />
<br />
<img src="https://objectstorage.ap-tokyo-1.oraclecloud.com/n/nrql75upzuqs/b/bucket-liberty-blog-20240513/o/jackro_blog2014081302.jpg" alt="jackro_blog2014081302" /><br />
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