asp.net - ASP.net GridView 和对象数据源

Question

如何配置 ASP.NET GridView 以通过 Object DataSource 填充它，其中对象方法需要 noticeCode 以通过 C# 代码传递？

StudentControlPanel.aspx.cs

protected void Page_Load(object sender, EventArgs e)
    {
        string username = (string)Request.QueryString["username"];

        Student std = Student.GetStudentByUsername(username);

        if (std != null)
        {
            labName.Text = std.StudentName;
            labUsername.Text = username;
            labRollNo.Text = std.RollNo;
            labRegNo.Text = std.RegNo;

            Dept dpt = std.Department;

            if (dpt != null)
            {
                labDepartment.Text = dpt.DeptName;
            }
            else
            {
                labDepartment.Text = "?";
            }
        }

        /*        Student-class has a SessionCode-property          */
        /*        I need to pass this to Notice.GetNoticesBySessionCode()...*/
    }

通知.cs

public class Notice
{
public static List<Notice> GetNoticesBySessionCode(string sessionCode)
        {
            List<Notice> notices = null;

            /*      EcecuteReader().....         */

            return notices;
        }
    }

Answer 1

您必须std.SessionCode在代码隐藏中将 的值绑定到 ObjectDataSource。在上面的“配置数据源”屏幕中，暂时选择无。您将动态绑定它。

如果您的 ObjectDataSource 如下所示：

<asp:ObjectDataSource ID="myObjDS" runat="server"
  TypeName="YourNamespace.Notice"
  SelectMethod="GetNoticesBySessionCode">
  <SelectParameters>
    <asp:Parameter Name="sessionCode" Type="String"/>
  </SelectParameters>
</asp:ObjectDataSource>

然后

if (std != null)
{
  //all the other code you have above.
  myObjDS.SelectParameters["sessionCode"].DefaultValue = std.SessionCode;
  myObjDS.DataBind(); //ensure you actually need this, may cause a double roundtrip to your DB.
}

Answer 2

上面的答案已经很好地涵盖了。只是添加，你也可以在objectdatasource的onselecting事件中添加参数。

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.objectdatasource.selecting.aspx