C#利用DesignSurface实现简单的窗体设计器的方法介绍（图文）

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;

}