Question

我编写了一个相当简单的Web服务，它将SQL查询的结果集放入列表中。我在使用Web服务的项目中使用结果集调用该列表时遇到问题。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ViewData课程中执行此类操作，以便将结果存储在变量中并将其分配给textblocks等。

title = res.TitleView;

但它不允许我......有人看到我失踪的东西吗？

注意：这是一个通用Windows应用程序

Answer 1

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

Answer 2

您的DataMember数据合约属性中缺少ViewDetails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;
    }
}

从Web服务获取返回的列表

2 个答案: