InitializeComponent方法是Visual Studio设计器自动生成的，注释中也有警告除非必要不要修改里面的代码，因为在改变页面设计后，所做的修改会被覆盖。
但是要生成代码就需要写出这里面的代码了，InitializeComponent方法内容分下面几部分：
1.组件容器components初始化
2.控件生成&设置属性（部分控件需要SuspendLayout，防止属性设置过程中造成闪烁）
3.画面本身生成&属性设置
4.部分控件ResumeLayout

参考MSDN文档：

https://docs.microsoft.com/zh-cn/dotnet/api/system.codedom.codetypeofexpression?view=netframework-4.5

  1. // Creates a reference to the System.DateTime type.
  2. CodeTypeReference typeRef1 = new CodeTypeReference("System.DateTime");
  4. // Creates a typeof expression for the specified type reference.
  5. CodeTypeOfExpression typeof1 = new CodeTypeOfExpression(typeRef1);
  7. // Create a C# code provider
  8. CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");
  10. // Generate code and send the output to the console
  11. provider.GenerateCodeFromExpression(typeof1, Console.Out, new CodeGeneratorOptions());
  12. // The code generator produces the following source code for the preceeding example code:
  13. //    typeof(System.DateTime)

可以使用

  1. CodeVariableDeclarationStatement _resources 
  2.  = new CodeVariableDeclarationStatement(
  3.     typeof(System.ComponentModel.ComponentResourceManager),
  4.     "resources",
  5.     new CodeObjectCreateExpression(" System.ComponentModel.ComponentResourceManager",
  6.                                    new CodeTypeOfExpression(new CodeTypeReference("MainFrm"))
  7.                                   )
  8. );

生成：

  1. System.ComponentModel.ComponentResourceManager resources = new 
  2.     System.ComponentModel.ComponentResourceManager(typeof(MainFrm));

例如，CodeDom代码如下：

  1. // this.components = new System.ComponentModel.Container();
  2. CodeStatement createComponents = new CodeAssignStatement(
  3.     new CodePropertyReferenceExpression(
  4.         new CodeThisReferenceExpression(), "components"),
  5.         new CodeObjectCreateExpression("System.ComponentModel.Container", new CodeExpression[]{}));
  6. cmm.Statements.Add(createComponents);
  8. //this.groupBox1 = new GroupBox(this.components);
  9. CodeStatement create = new CodeAssignStatement(
  10.     new CodePropertyReferenceExpression(
  11.         new CodeThisReferenceExpression(), groupBox.Name),
  12.         new CodeObjectCreateExpression("GroupBox",
  13.             new CodeExpression[] 
  14.         {
  15.             new CodePropertyReferenceExpression(
  16.                 new CodeThisReferenceExpression(), "components")
  17.         }));
  18. cmm.Statements.Add(create);
  20. //((System.ComponentModel.ISupportInitialize)(this.groupBox1)).BeginInit();
  21. CodeStatement beginInit new CodeMethodInvokeExpression(
  22.     new CodeCastExpression("System.ComponentModel.ISupportInitialize",
  23.         new CodePropertyReferenceExpression(
  24.             new CodeThisReferenceExpression(), ctrlName)),
  25.             "BeginInit",
  26.             new CodeExpression[] { });  
  27. cmm.Statements.Add(beginInit);
  29. //this.groupBox1.SuspendLayout();
  30. CodeStatement suspendLayout = new CodeMethodInvokeExpression(
  31.     new CodePropertyReferenceExpression(
  32.         new CodeThisReferenceExpression(), ctrlName),
  33.         "SuspendLayout",
  34.         new CodeExpression[] { });            
  35. cmm.Statements.Add(suspendLayout);
  37. //this.groupBox1.Appearance.BackColor = System.Drawing.SystemColors.Control;
  38. CodeStatement backColor = new CodeAssignStatement(
  39.     new CodePropertyReferenceExpression(
  40.         new CodePropertyReferenceExpression(
  41.             new CodeThisReferenceExpression(), ctrlName), "Appearance.BackColor"),
  42.             new CodeSnippetExpression("System.Drawing.SystemColors.Control")
  43.                 );
  44. cmm.Statements.Add(backColor);
  46. //this.groupBox1.Appearance.Options.UseBackColor = true;
  47. CodeStatement useBackColor = new CodeAssignStatement(
  48.     new CodePropertyReferenceExpression(
  49.         new CodePropertyReferenceExpression(
  50.             new CodeThisReferenceExpression(), ctrlName), "Appearance.Options.UseBackColor"),
  51.             new CodeSnippetExpression("true"));
  52. cmm.Statements.Add(useBackColor);
  54. //Controls.Add
  55. foreach (Control ctrl in groupBox.Controls)
  56. {
  57.     CodeStatement addControl = new CodeMethodInvokeExpression(
  58.     new CodePropertyReferenceExpression(
  59.         new CodePropertyReferenceExpression(
  60.             new CodeThisReferenceExpression(), ctrlName), "Controls"), "Add",
  61.             new CodeExpression[] 
  62.                 { 
  63.                     new CodePropertyReferenceExpression(
  64.                         new CodeThisReferenceExpression(), childName)
  65.                 });
  66.     cmm.Statements.Add(addControl);
  67. }
  69. //this.groupBox1.Dock = System.Windows.Forms.DockStyle.Fill;
  70. CodeStatement dock = new CodeAssignStatement(
  71.     new CodePropertyReferenceExpression(
  72.         new CodePropertyReferenceExpression(
  73.             new CodeThisReferenceExpression(), ctrlName), "Dock"),
  74.             new CodePropertyReferenceExpression(
  75.                 new CodeTypeReferenceExpression("System.Windows.Forms.DockStyle"), "Fill"));    
  76. cmm.Statements.Add(dock);
  78. //this.groupBox1.Location = new System.Drawing.Point(242, 54);
  79. CodeStatement location = new CodeAssignStatement(
  80.     new CodePropertyReferenceExpression(
  81.         new CodePropertyReferenceExpression(
  82.             new CodeThisReferenceExpression(), ctrlName), "Location"),
  83.             new CodeObjectCreateExpression(new CodeTypeReference("System.Drawing.Point"),
  84.                 new CodeExpression[]
  85.                 {
  86.                     new CodePrimitiveExpression(242),
  87.                     new CodePrimitiveExpression(54)
  88.                 }));  
  89. cmm.Statements.Add(location);
  91. //this.groupBox1.Name = "groupBox1";
  92. CodeStatement name = new CodeAssignStatement(
  93.     new CodePropertyReferenceExpression(
  94.         new CodePropertyReferenceExpression(
  95.             new CodeThisReferenceExpression(), ctrlName), "Name"),
  96.             new CodePrimitiveExpression("groupBox1"));
  97. cmm.Statements.Add(name);
  99. //this.groupBox1.Size = new System.Drawing.Size(233, 42);
  100. CodeStatement size = new CodeAssignStatement(
  101.     new CodePropertyReferenceExpression(
  102.         new CodePropertyReferenceExpression(
  103.             new CodeThisReferenceExpression(), ctrlName), "Size"),
  104.             new CodeObjectCreateExpression(new CodeTypeReference("System.Drawing.Size"),
  105.                 new CodeExpression[]
  106.                 {
  107.                     new CodePrimitiveExpression(233),
  108.                     new CodePrimitiveExpression(42)
  109.                 }));
  110. cmm.Statements.Add(size);
  112. //this.groupBox1.TabIndex = 7;
  113. CodeStatement tabIndex = new CodeAssignStatement(
  114.     new CodePropertyReferenceExpression(
  115.     new CodePropertyReferenceExpression(
  116.         new CodeThisReferenceExpression(), ctrlName), "TabIndex"),
  117.         new CodePrimitiveExpression(7)); 
  118. cmm.Statements.Add(tabIndex);
  120. //this.groupBox1.Text = "groupBox1";
  121. CodeStatement text = new CodeAssignStatement(
  122.     new CodePropertyReferenceExpression(
  123.         new CodePropertyReferenceExpression(
  124.             new CodeThisReferenceExpression(), ctrlName), "Text"),
  125.             new CodePrimitiveExpression("groupBox1"));
  126. cmm.Statements.Add(text);
  128. //this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Inherit;
  129. CodeStatement autoScaleMode = new CodeAssignStatement(
  130.     new CodePropertyReferenceExpression(
  131.         new CodeThisReferenceExpression(), "AutoScaleMode"),
  132.         new CodePropertyReferenceExpression(
  133.             new CodeTypeReferenceExpression("System.Windows.Forms.AutoScaleMode"), "Inherit"));
  134. cmm.Statements.Add(autoScaleMode);
  136. //this.ClientSize = new System.Drawing.Size(534, 470);
  137. CodeStatement clientSize = new CodeAssignStatement(
  138.     new CodePropertyReferenceExpression(
  139.         new CodeThisReferenceExpression(), "ClientSize"),
  140.         new CodeObjectCreateExpression(
  141.             new CodeTypeReference("System.Drawing.Size"),
  142.             new CodeExpression[]
  143.             {
  144.                 new CodePrimitiveExpression(534),
  145.                 new CodePrimitiveExpression(470)
  146.             }));
  147. cmm.Statements.Add(clientSize);
  149. //this.groupBox1.Controls.Add(XXX);
  150. CodeExpression ctrls = new CodeMethodInvokeExpression(
  151.     new CodePropertyReferenceExpression(
  152.         new CodeThisReferenceExpression(), "Controls"), "Add",
  153.         new CodeExpression[]
  154.     {
  155.         new CodePropertyReferenceExpression(
  156.             new CodeThisReferenceExpression(), ctrl.Name)
  157.     });
  158. cmm.Statements.Add(ctrls);
  160. //this.Name = "Form2";
  161. CodeStatement name = new CodeAssignStatement(
  162.     new CodePropertyReferenceExpression(
  163.         new CodeThisReferenceExpression(), "Name"),
  164.         new CodePrimitiveExpression(winForm.Text));
  165. cmm.Statements.Add(name);
  167. //this.Text = "Form2";
  168. CodeStatement text = new CodeAssignStatement(
  169.     new CodePropertyReferenceExpression(
  170.         new CodeThisReferenceExpression(), "Text"),
  171.         new CodePrimitiveExpression(winForm.Text));
  172. cmm.Statements.Add(text);
  174. //((System.ComponentModel.ISupportInitialize)(this.group2)).EndInit();
  175. CodeStatement new CodeMethodInvokeExpression(
  176.     new CodeCastExpression("System.ComponentModel.ISupportInitialize",
  177.         new CodePropertyReferenceExpression(
  178.             new CodeThisReferenceExpression(), ctrlName)),
  179.             "EndInit",
  180.             new CodeExpression[] { });  
  182. //this.group2.ResumeLayout(false);
  183. CodeStatement resumeLayout = new CodeMethodInvokeExpression(
  184.     new CodePropertyReferenceExpression(
  185.         new CodeThisReferenceExpression(), ctrlName),
  186.         "ResumeLayout",
  187.         new CodeExpression[] 
  188.         { 
  189.             new CodeSnippetExpression("false") 
  190.         });
  191. cmm.Statements.Add(resumeLayout);
  193. //this.ResumeLayout(false);
  194. CodeExpression resumeLayout = new CodeMethodInvokeExpression(
  195.     new CodeThisReferenceExpression(), "ResumeLayout", 
  196.     new CodeExpression[]
  197.     {
  198.         new CodeSnippetExpression("false")
  199.     });
  200. cmm.Statements.Add(resumeLayout);

其中ctrlName都是“groupBox1”。
每部分生成的代码就是上面的注释部分。
当然可以考虑将一些通用的属性设置提取为公用方法，如Name, Text, Location, Size, TabIndex等等。
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版权声明：本文为CSDN博主「莱昂纳多达芬奇」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/davinciyxw/article/details/7793089