从 Web 服务获取返回列表

Question

我编写了一个相当简单的 Web 服务，它将 SQL 查询的结果集放入一个列表中。我在使用 Web 服务的项目中调用带有结果集的列表时遇到问题。我将把我的代码放在下面：

网络服务

[OperationContract]
List<ViewDetails> ViewDetails();

[DataContract]
public class ViewDetails
{
    public string TitleView { get; set; }
    public string BodyView { get; set; }
    public string AuthorView { get; set; }

    public ViewDetails() { }
    public ViewDetails(string myTitleView, string myBodyView, string myAuthorView)
    {
        this.TitleView = myTitleView;
        this.BodyView = myBodyView;
        this.AuthorView = myAuthorView;
    }
}

 public List<ViewDetails> ViewDetails()
    {
        List<ViewDetails> details = new List<ViewDetails>();

        SqlConnection conn = new SqlConnection(strConnString);
        conn.Open();
        SqlCommand cmd = new SqlCommand("SELECT TOP 2 [My_Title] AS 'Title', [My_Body] AS 'Body', [My_Author] AS 'Author' FROM [My_table] ORDER BY [Date] DESC", conn);
        SqlDataReader rdrDetails = cmd.ExecuteReader();

        try
        {
            while (rdrDetails.Read())
            {
                details.Add(new ViewDetails(rdrDetails.GetSqlString(rdrDetails.GetOrdinal("Title")).ToString(), rdrDetails.GetSqlString(rdrDetails.GetOrdinal("Body")).ToString(), rdrDetails.GetSqlString(rdrDetails.GetOrdinal("Author")).ToString()));
            }
        }
        catch (Exception e)
        {
            //exception
        }
        finally
        {
            conn.Close();
        }

        return details;
    }

我正在使用网络服务的项目

 public async void ViewData()
 {
        ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
        string title = string.Empty;
        string body = string.Empty;
        string author = string.Empty;

        var res = await client.ViewDetailsAsync();
  }

我希望能够在我的 ViewData 类中做这样的事情，这样我就可以将结果存储在变量中并将它们分配给 textblocks 等。

title = res.TitleView;

但它不允许我....有人看到我缺少的东西吗？

注意：这是一个通用 Windows 应用程序

Answer 1

您的ViewDetails 数据协定属性中缺少DataMember 属性。

[DataContract]
public class ViewDetails
{
   [DataMember]  
   public string TitleView { get; set; }
   [DataMember]
   public string BodyView { get; set; }
   [DataMember]
   public string AuthorView { get; set; }

    public ViewDetails() { }
    public ViewDetails(string myTitleView, string myBodyView, string myAuthorView)
    {
     this.TitleView = myTitleView;
     this.BodyView = myBodyView;
     this.AuthorView = myAuthorView;
    }
}

Answer 2

您错过了res 是List<ViewDetails>。 res 不是 ViewDetails 的实例。所以你应该输入title = res[0].TitleView;