blocks|key|871474|text|将学生用作单例班级/表单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|871475|public+class+Students:+Form
{
++++private+static+Students+_Self;
++++public+static+Students+ShowOrActivate(Form+parent)
++++{
++++++++if+(_Self+==+null)
++++++++{
++++++++++++_Self+=+new+Students();
++++++++++++_Self.MdiParent+=+this;
++++++++++++_Self.Show();
++++++++}
++++++++else
++++++++++++_Self.Activate();
++++}
}|code-block|syntax|javascript|871476|现在使用以下命令显示表单|871477|private+void+studentsToolStripMenuItem1_Click(object+sender,+EventArgs+e)
{
Students.ShowOrActivate(this);
}|871478|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Use Students as singleton class/form:

<pre><code>public class Students: Form
{
 private static Students _Self;
 public static Students ShowOrActivate(Form parent)
 {
 if (_Self == null)
 {
 _Self = new Students();
 _Self.MdiParent = this;
 _Self.Show();
 }
 else
 _Self.Activate();
 }
}
</code></pre>

Now show the form with

<pre><code>private void studentsToolStripMenuItem1_Click(object sender, EventArgs e)
{
Students.ShowOrActivate(this);
}
</code></pre>

blocks|key|871483|text|你的代码并没有什么真正的问题。你可以通过一些反思来使它变得干燥：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|871484|++++public+Form+CreateMdiChild(Type+type,+bool+singleton)+{
++++++++if+(singleton)+{
++++++++++++foreach+(var+child+in+this.MdiChildren)+{
++++++++++++++++if+(child.GetType()+==+type)+{
++++++++++++++++++++child.WindowState+=+FormWindowState.Normal;
++++++++++++++++++++child.Show();
++++++++++++++++++++child.Activate();
++++++++++++++++++++return+child;
++++++++++++++++}
++++++++++++}
++++++++}
++++++++Form+form+=+(Form)Activator.CreateInstance(type);
++++++++form.MdiParent+=+this;
++++++++form.Show();
++++++++return+form;
++++}|code-block|syntax|javascript|871485|用法：|871486|+CreateMdiChild(typeof(Students),+true);|871487|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

There's nothing really wrong with the code you have. You can make it DRY with a bit of reflection:

<pre><code> public Form CreateMdiChild(Type type, bool singleton) {
 if (singleton) {
 foreach (var child in this.MdiChildren) {
 if (child.GetType() == type) {
 child.WindowState = FormWindowState.Normal;
 child.Show();
 child.Activate();
 return child;
 }
 }
 }
 Form form = (Form)Activator.CreateInstance(type);
 form.MdiParent = this;
 form.Show();
 return form;
 }
</code></pre>

Usage:

<pre><code> CreateMdiChild(typeof(Students), true);
</code></pre>

blocks|key|872068|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|872069|private+void+CreateMdiChild<T>(ref+T+t)+where+T+:+Form,+new()
{++++++++++++
++++if+(t+==+null+%7C%7C+t.IsDisposed)
++++{
++++++++t+=+new+T();
++++++++t.MdiParent+=+this;
++++++++t.Show();
++++}
++++else
++++{
++++++++if+(t.WindowState+==+FormWindowState.Minimized)
++++++++{
++++++++++++t.WindowState+=+FormWindowState.Normal;
++++++++}
++++++++else
++++++++{
++++++++++++t.Activate();
++++++++}
++++}
}|code-block|syntax|javascript|872070|用法：|872071|Students+students;
private+void+studentsToolStripMenuItem1_Click(object+sender,+EventArgs+e)
{
++++CreateMdiChild<Students>(ref+students);
}|872072|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Try this

<pre><code>private void CreateMdiChild&lt;T&gt;(ref T t) where T : Form, new()
{ 
 if (t == null || t.IsDisposed)
 {
 t = new T();
 t.MdiParent = this;
 t.Show();
 }
 else
 {
 if (t.WindowState == FormWindowState.Minimized)
 {
 t.WindowState = FormWindowState.Normal;
 }
 else
 {
 t.Activate();
 }
 }
}
</code></pre>

Usage:

<pre><code>Students students;
private void studentsToolStripMenuItem1_Click(object sender, EventArgs e)
{
 CreateMdiChild&lt;Students&gt;(ref students);
}
</code></pre>

How do I create a function for my following code so that i may not have to write the following whole code to make a form be used as MDICHILD Form.

<pre><code>Students stu = null;
private void studentsToolStripMenuItem1_Click(object sender, EventArgs e)
{
 if (stu == null || stu.IsDisposed)
 {
 stu = new Students();
 stu.MdiParent = this;
 stu.Show();
 }
 else
 {
 stu.Activate();
 }
}
</code></pre>

How to create a function for mdi container

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我如何为我的下面的代码创建一个函数，这样我就不必编写下面的整个代码来将一个表单用作MDICHILD表单。Students stu = null;private void studentsToolStripMenuItem1_Click(object sender, EventArgs e){  if (stu == n...

问如何为mdi容器创建函数
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问如何为mdi容器创建函数EN