C#利用DesignSurface如何实现简单的窗体设计器

private void Form1_Load(object sender, EventArgs e) {  //引用System.Deisgn.dll  DesignSurface ds = new DesignSurface();  //开始加载窗体  ds.BeginLoad(typeof(Form));  Control designerContorl = (Control)ds.View;  designerContorl.Dock = DockStyle.Fill;  this.Controls.Add(designerContorl); }

protected override CodeCompileUnit Parse() {    #region 源文件读取  var sw = new StreamReader(@"E:/FrmUser.cs");  var sw_designer = new StreamReader(@"E:/FrmUser.Designer.cs");  string formCodeCS = sw.ReadToEnd();  string formCodeDesigner = sw_designer.ReadToEnd();  List<string> source = new List<string>();  source.Add(formCodeCS);  source.Add(formCodeDesigner);  #endregion  //Rolsyn解析C#  var rootDesigner = Source2CodeDom.Parse(formCodeDesigner);  codeDesingerCompileUnit = Source2CodeDom.GetDesignerCodeComplieUnit(rootDesigner);  var rootCS = Source2CodeDom.Parse(formCodeCS);  codeCSCompileUnit = Source2CodeDom.GetCodeComplieUnit(rootCS);  //MergeFormSource  string mergeS = Source2CodeDom.MergeFormSource(formCodeDesigner, formCodeCS);  codeMergeCompileUnit = Source2CodeDom.GetMergeDesignerCodeComplieUnit(mergeS);  return codeMergeCompileUnit;

public static CodeCompileUnit GetDesignerCodeComplieUnit2(CompilationUnitSyntax root) {  CodeCompileUnit ccu = new CodeCompileUnit();  var firstMember = root.Members[0];  var namespaceDeclration = (NamespaceDeclarationSyntax)firstMember;  var designClassDeclaration = (ClassDeclarationSyntax)namespaceDeclration.Members[0];  var myDesignerClass = new CodeTypeDeclaration(designClassDeclaration.Identifier.ToString());  var initializeComponent = new CodeMemberMethod();  var ns = new CodeNamespace(namespaceDeclration.Name.ToString());  foreach (var m in designClassDeclaration.Members)  {  if (m is ConstructorDeclarationSyntax)  {   var ctor = ((ConstructorDeclarationSyntax)m);   var codeBody = ctor.Body.ToString();   codeBody = codeBody.Trim().TrimStart('{').TrimEnd('}').Trim().TrimEnd(';');   CodeSnippetExpression csbody = new CodeSnippetExpression(codeBody);   CodeExpressionStatement stmt = new CodeExpressionStatement(csbody);   //Add the expression statements to the method.   // InitializeComponent   var cctor = new CodeConstructor();   cctor.Name = ctor.Identifier.ToString();   //var cmm = new CodeMemberMethod();   //cmm.Name = ctor.Identifier.ToString();   //cmm.Attributes = GetCtoRAttrMapping(ctor);   //cmm.ReturnType = new CodeTypeReference(typeof(void));   cctor.Statements.Add(stmt);   myDesignerClass.Members.Add(cctor);  }  if (m is FieldDeclarationSyntax)  {   var F = ((FieldDeclarationSyntax)m);   var type = F.Declaration.Type;   foreach (var variable in F.Declaration.Variables)   {   var field = new CodeMemberField();   field.Name = variable.Identifier.ToString();   field.Type = new CodeTypeReference(type.ToString());   field.Attributes = GetFieldAttrMapping(F);   //field.InitExpression = new CodePrimitiveExpression(null);   myDesignerClass.Members.Add(field);   }  }  if (m is MethodDeclarationSyntax)  {   var node = m as MethodDeclarationSyntax;   #region xml comments   var xmlTrivia = node.GetLeadingTrivia()   .Select(i => i.GetStructure())   .OfType<DocumentationCommentTriviaSyntax>()   .FirstOrDefault();    #endregion   var method = (MethodDeclarationSyntax)m;   var cmm = new CodeMemberMethod();   cmm.Name = method.Identifier.ToString();   ///XML注释   string[] comments = xmlTrivia.ToString().Split("/r/n".ToCharArray());   foreach (string text in comments)   {   if (text.Trim() != "")   {    cmm.Comments.Add(new CodeCommentStatement(text.Trim().TrimStart("///".ToCharArray()).Trim(), true));   }   }   if (cmm.Name == "InitializeComponent")   {   //region    CodeRegionDirective codeRegion = new CodeRegionDirective(CodeRegionMode.Start, "Windows 窗体设计器生成的代码");   CodeRegionDirective codeEndRegion = new CodeRegionDirective(CodeRegionMode.End, "");   cmm.StartDirectives.Add(codeRegion);   cmm.EndDirectives.Add(codeEndRegion);   }   //MemberAttributes.Family is protected   //cmm.Attributes = MemberAttributes.Override | MemberAttributes.Family;   cmm.Attributes = GetMethodAttrMapping(method);   cmm.ReturnType = new CodeTypeReference(method.ReturnType.ToString());   foreach (var p in method.ParameterList.Parameters)   {   CodeParameterDeclarationExpression cpd = new CodeParameterDeclarationExpression();   cpd.Name = p.Identifier.ToString();   cpd.Type = new CodeTypeReference(p.Type.ToString());   cmm.Parameters.Add(cpd);   }   //包含方法{};，会重复生成{};   string codeBody = method.Body.ToString();   codeBody = codeBody.Trim().TrimStart('{').TrimEnd('}').Trim().TrimEnd(';');   if (codeBody != "")   {   CodeSnippetExpression csbody = new CodeSnippetExpression(codeBody);   CodeExpressionStatement stmt = new CodeExpressionStatement(csbody);   //Add the expression statements to the method.   cmm.Statements.Add(stmt);   }   myDesignerClass.Members.Add(cmm);  }  if (m is MemberDeclarationSyntax)  {  }  }  ccu.Namespaces.Add(ns);  //Partial Class  myDesignerClass.IsPartial = true;   ns.Types.Add(myDesignerClass);    return ccu; }

 //直接返回代码，最简单 public string GetTextCSCode() { Flush(); return __CSTextCode; }