using System;

public class MyClass : Entity<long>
{
    public long Id
    {
        get;
        set;
    }

    [required]
    public string Name
    {
        get;
        set;
    }

    public string Slug
    {
        get;
        set;
    }

    public DateTime CreatedOn
    {
        get;
        private set;
    }

    public DateTime UpdatedOn
    {
        get;
        private set;
    }

    /* ... */
}

目前我手动创建数据契约类,如下所示：

[DataContract(Namespace = "http://example.com/",Name = "MyClass")]
public sealed class MyClass
{
    [DataMember(EmitDefaultValue = false,Name = "Id")]
    public long Id
    {
        get;
        set;
    }

    [DataMember(EmitDefaultValue = false,Name = "Name",Isrequired = true)]
    public string Name
    {
        get;
        set;
    }

    [DataMember(EmitDefaultValue = false,Name = "Slug")]
    public string Slug
    {
        get;
        set;
    }

    [DataMember(EmitDefaultValue = false,Name = "CreatedOn")]
    public DateTime CreatedOn
    {
        get;
        set;
    }

    [DataMember(EmitDefaultValue = false,Name = "UpdatedOn")]
    public DateTime UpdatedOn
    {
        get;
        set;
    }
}

我想使用Roslyn重写“MyClass.cs”,所以它看起来像我手工创建的类.目前我有以下：

using System;
using System.IO;
using Roslyn.Compilers.CSharp;

internal class Program
{
    private static void Main()
    {
        var reader = new StreamReader(@"..\..\MyClass.cs");
        var source = reader.ReadToEnd();
        var tree = SyntaxTree.ParseCompilationUnit(source);
        var rewriter = new MyRewriter();
        var newRoot = rewriter.Visit(tree.Root);
        Console.WriteLine(newRoot.Format());
    }
}

public class MyRewriter : SyntaxRewriter
{
    protected override SyntaxNode VisitClassDeclaration(ClassDeclarationSyntax node)
    {
        var declaration = (TypeDeclarationSyntax) base.VisitClassDeclaration(node);

        return ((ClassDeclarationSyntax) declaration).Update(
            declaration.Attributes,Syntax.TokenList(Syntax.Token(SyntaxKind.PublicKeyword),Syntax.Token(SyntaxKind.SealedKeyword)),declaration.Keyword,declaration.Identifier,declaration.TypeParameterListOpt,null,declaration.ConstraintClauses,declaration.OpenBraceToken,declaration.Members,declaration.CloseBraceToken,declaration.SemicolonTokenOpt);
    }

    protected override SyntaxNode VisitPropertyDeclaration(PropertyDeclarationSyntax node)
    {
        var typeSyntax = node.Type;

        if (node.Identifier.ValueText == "Id")
        {
            typeSyntax = Syntax.IdentifierName("string");
        }

        var newProperty = Syntax.PropertyDeclaration(
            modifiers: Syntax.TokenList(Syntax.Token(SyntaxKind.PublicKeyword)),type: typeSyntax,identifier: node.Identifier,accessorList: Syntax.AccessorList(
                accessors: Syntax.List(
                    Syntax.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration,semicolonTokenOpt: Syntax.Token(SyntaxKind.SemicolonToken)),Syntax.AccessorDeclaration(SyntaxKind.SetAccessorDeclaration,semicolonTokenOpt: Syntax.Token(SyntaxKind.SemicolonToken))
                    )
                )
            );

        return newProperty;
    }
}

我一直在尝试找到一种方法来将DataMember和DataContract自定义属性添加到MyClass,但是不成功.如何添加自定义属性？