在“设计”视图中显示以编程方式添加到WinForms应用程序中的控件？ [英] Show controls added programmatically in WinForms app in Design view?
问题描述
使用Visual Studio（可以使用任何版本），切换回设计视图时是否可以通过编程方式（而不是通过设计视图）显示控件？
Using Visual Studio (any version will do), is it possible for controls added programmatically (rather than via the Design view) to then be shown when switching back to the Design view?
我尝试了一些简单的事情，如：
I've tried something ridiculously simple like:
public Form1()
{
AddCtrl();
InitializeComponent();
AddCtrl();
}
private void AddCtrl()
{
this.SuspendLayout();
this.Controls.Add(new TextBox());
this.ResumeLayout(false);
this.PerformLayout();
}
...但无济于事。
推荐答案
设计器是否运行我的代码？
当表单在设计器中显示时，设计器反序列化表单的代码（Form1.Designer.cs或Form1.cs中的第一类）并创建表单基类的实例并反序列化 InitializeComponent 并创建您在类中声明的控件并设置其属性。
Does the designer run my code?
When a form shows in designer, the designer deserialize the code of your form (Form1.Designer.cs or first class in Form1.cs) and creates an instance of the base class of your form and deserialize InitializeComponent and creates controls that you declared in your class and set their properties.
因此赢得了构造函数中的代码没跑设计器仅创建表单基类的实例，而不查看表单的构造函数。
So the codes in Constructor won't run. The designer only creates an instance of the base class of your form and don't look in constructor of your form.
请看下面的代码，并注意以下问题：
Look at below code and pay attention to this problems:
- 其中
;s？ - 构造函数
Form111111forForm1？ - 什么是
NotDefinedFunction（）？ - 如何
int i = xxxxxxxxxx？
- Where are
;s? - Constructor
Form111111forForm1? - What is
NotDefinedFunction()? - How can
int i = "xxxxxxxxxx"?
即使您创建这样的文件，设计者也会
Even if you create such file, the designer will show correctly.
using System
using System.Collections.Generic
using System.Drawing
using System.Windows.Forms
namespace Sample
{
public class Form1:Form
{
public Form111111()
{
NotDefinedFunction()
InitializeComponent()
}
public void InitializeComponent()
{
int i = "xxxxxxxxxx"
this.textBox1 = new System.Windows.Forms.TextBox()
this.SuspendLayout()
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(0, 0)
this.textBox1.Name = "textBox1"
this.textBox1.Text = "text of text box 1";
//
// Form1
//
this.Controls.Add(this.textBox1)
this.Name = "Form1"
this.Text = "Form1"
this.Size= new Size(250,100)
this.ResumeLayout(false)
this.PerformLayout()
}
private TextBox textBox1
}
}
您将在设计器中看到以下表单：
And you will see the form in designer:
如果需要这种功能，则可以在表单的基类的构造函数中创建动态控件，因为在打开子窗体时将运行基类的构造函数设计师，那么它将在设计时运行。
If you need such functionality, you can create your dynamic controls in constructor of a base class for your form, since constructor of base class will run when you open a child form in designer, then it will run at design time.
但是您应该知道这些控件是继承的，不能使用子窗体的设计器进行更改。
But you should know these controls are inherited and can't be changed using designer of child form.
因此，只需创建一个Form2：
So simply create a Form2:
public Form2()
{
InitializeComponent();
AddDynamicControls();
}
private void AddDynamicControls()
{
this.Controls.Add(
new TextBox() {
Name = "TextBox1", Text = "Dynamic", Location = new Point(100, 0) });
}
构建项目，然后更改 Form1的基类继承自 Form2 ：
Build the project and then change base class of Form1 to inherit from Form2:
public class Form1:Form2
结果为：
如果您真的想在设计时生成一些控件，我想您应该看看 T4文字模板。
If you want to generate some controls really at design time, I think you should take a look at T4 Text Templates.
您可以使用t4模板在设计时生成代码。可能您已经看到了Entity Framework .tt 模板文件。您可以将新的文本模板项添加到项目中，并将在设计时生成项的逻辑放在t4模板中。
You can use t4 templates to generate code at design-time. Probably you have seen Entity Framework .tt template files. You can add new Text Template item to your project and put the logic for generating items at design-time in your t4 template.
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