Question

我从https://msdn.microsoft.com/en-us/magazine/mt707527.aspx得到了以下来源，它使用Roslyn生成类：

    // Get a workspace
    var workspace = new AdhocWorkspace();

    // Get the SyntaxGenerator for the specified language
    var generator = SyntaxGenerator.GetGenerator(workspace, LanguageNames.CSharp);

    // Create using/Imports directives
    var usingDirectives = generator.NamespaceImportDeclaration("System");

    // Generate two private fields
    var lastNameField = generator.FieldDeclaration("_lastName",
      generator.TypeExpression(SpecialType.System_String),
      Accessibility.Private);
    var firstNameField = generator.FieldDeclaration("_firstName",
      generator.TypeExpression(SpecialType.System_String),
      Accessibility.Private);

    // Generate two properties with explicit get/set
    var lastNameProperty = generator.PropertyDeclaration("LastName",
      generator.TypeExpression(SpecialType.System_String), Accessibility.Public,
      getAccessorStatements: new SyntaxNode[]
      { generator.ReturnStatement(generator.IdentifierName("_lastName")) },
      setAccessorStatements: new SyntaxNode[]
      { generator.AssignmentStatement(generator.IdentifierName("_lastName"),
    generator.IdentifierName("value"))});
    var firstNameProperty = generator.PropertyDeclaration("FirstName",
      generator.TypeExpression(SpecialType.System_String),
      Accessibility.Public,
      getAccessorStatements: new SyntaxNode[]
      { generator.ReturnStatement(generator.IdentifierName("_firstName")) },
      setAccessorStatements: new SyntaxNode[]
      { generator.AssignmentStatement(generator.IdentifierName("_firstName"),
      generator.IdentifierName("value")) });

    // Generate parameters for the class' constructor
    var constructorParameters = new SyntaxNode[] {
      generator.ParameterDeclaration("LastName",
      generator.TypeExpression(SpecialType.System_String)),
      generator.ParameterDeclaration("FirstName",
      generator.TypeExpression(SpecialType.System_String)) };

    // Generate the constructor's method body
    var constructorBody = new SyntaxNode[] {
      generator.AssignmentStatement(generator.IdentifierName("_lastName"),
      generator.IdentifierName("LastName")),
      generator.AssignmentStatement(generator.IdentifierName("_firstName"),
      generator.IdentifierName("FirstName"))};


    // Generate the class' constructor
    var constructor = generator.ConstructorDeclaration("Person",
      constructorParameters, Accessibility.Public,
      statements: constructorBody);

    // An array of SyntaxNode as the class members
    var members = new SyntaxNode[] { lastNameField,
    firstNameField, lastNameProperty, firstNameProperty,
    constructor };

    // Generate the class
    var classDefinition = generator.ClassDeclaration(
      "Person", typeParameters: null,
      accessibility: Accessibility.Public,
      modifiers: DeclarationModifiers.Abstract,
      baseType: null,
      members: members);

    generator.AddBaseType(classDefinition, generator.IdentifierName("PersonBase"));

    // Declare a namespace
    var namespaceDeclaration = generator.NamespaceDeclaration("MyTypes", classDefinition);

    // Get a CompilationUnit (code file) for the generated code
    var newNode = generator.CompilationUnit(usingDirectives, namespaceDeclaration).
      NormalizeWhitespace();


    StringBuilder sb = new StringBuilder();
    using (StringWriter writer = new StringWriter(sb))
    {
        newNode.WriteTo(writer);
        Console.Write(writer.ToString());
    };

一切正常。现在，我需要生成具有名为“PersonBase”

的基类的Person类

我尝试使用下面的代码段，但它不会产生预期的结果：

generator.AddBaseType(classDefinition, generator.IdentifierName("PersonBase"));

我做错了什么？

我们非常感谢您的帮助。

感谢。

Answer 1

找到解决方案。

它似乎与Roslyn对象的不可变特性有关：

    var baseNode = generator.IdentifierName("PersonBase");

    // Generate the class
    var classDefinition = generator.ClassDeclaration(
      "Person", typeParameters: null,
      accessibility: Accessibility.Public,
      modifiers: DeclarationModifiers.Abstract,
      baseType: baseNode,
      members: members);

感谢。

c＃roslyn生成具有基类型的类

1 个答案: