无法使用XMLRPC发布Wordpress 3.5.2的帖子

我已经使用XMLRPC向Wordpress（3.5.2）发布了一个线程，这是我的代码：

public string newPost(string title, string content, string[] categoryIds)
    {
        this.Url = this.url ;
        Post post = new Post();
        post.post_date = DateTime.Now;
        post.post_title = title;
        post.post_content = content;
        post.post_status = "publish";
        XmlRpcStruct terms = new XmlRpcStruct();
        terms.Add("category", categoryIds);
        post.terms = terms;
        return newPost("0", this.username, this.password, post, true);
    }
    [XmlRpcMethod("wp.newPost ")]
    public string newPost(string blogId, string username, string password, Post content, bool pubish)
    {
        string s = "";
        try
        {
            s = (string)this.Invoke("newPost", new object[] { blogId, username, password, content, pubish });
        }
        catch (Exception ex)
        {
            s = ex.Message;
        }
        return s;
    }

但当我查看adnin的帖子时，它显示的是"预定"

知道吗？非常感谢。