ObjectDataSource 小结 二

一、自定义对象作为输入参数

注意，由于DataObjectDataSource 使用反射调用GUID函数，所以页面控件和Session等均不可以使用。

 

public class CustomParameter<T> : Parameter

   {

       T obj; //传?递?给?业?务?逻?辑?对?象?的?形?参?的?值?

       public T Value

       {

           get { return obj; }

           set { obj = value; }

       }

       public CustomParameter() { }

       //传?递?参?数?名?和?参?数?值?，?调?用?父?类?构?造?方?法?给?参?数?名?赋?值?，?并?把?参?数?值?保?存?到?obj里?。?

       public CustomParameter(string name, T value)

           : base(name)

       {

           obj = value;

       }

       public CustomParameter(string name, TypeCode type, T value)

           : base(name, type)

       {

           obj = value;

       }

       public CustomParameter(CustomParameter<T> original)

           : base(original)

       {

           obj = original.Value;

       }

       //被?DataSource控?件?绑?定?时?自?动?调?用?，?更?新?并?返?回?Parameter 对?象?的?值?。?

       protected override object Evaluate(HttpContext context, Control control)

       {

           return Value;

       }

   }

 

ObjectDataSource 对象

 

 

<asp:ObjectDataSource ID="ObjectDataSourceActivity" runat="server" DataObjectTypeName="Diebold.ProjectTracking.DBAccess.Activity"

    DeleteMethod="DeleteMethodHandler" InsertMethod="InsertMethodHandler" SelectMethod="SelectMethodHandler"

    TypeName="Diebold.ProjectTracking.Web.Controls.ActivityOutlookView" UpdateMethod="UpdateMethodHandler"

     OnInserted="ObjectDataSourceActivity_OnInserted">

</asp:ObjectDataSource>

 

 

在DataBind之前，设置好参数

 

          this.ObjectDataSourceActivity.SelectParameters.Clear();

          this.ObjectDataSourceActivity.SelectParameters.Add(new CustomParameter<List<int>>("ProjectIDList", this.ProjectIDList));

          this.ObjectDataSourceActivity.SelectParameters.Add(new CustomParameter<List<int>>("ActivityTypeIDList", this.ActivityTypeIDList));

 

定义查询函数

public IEnumerable SelectMethodHandler(List<int> projectIDList, List<int> activityTypeIDList)

{

    ActivityList curActivityList = new ActivityList();

    this.CurActivityList = this.CurDBManager.Activity.Select(projectIDList, activityTypeIDList);

    foreach (Activity activity in this.CurActivityList)

    {

        activity.ActivityTypeReference.Load();

        activity.ProjectReference.Load();

        activity.ProjectStatusReference.Load();

        activity.UserInfoReference.Load();

        activity.LoadData();

        curActivityList.Add(activity);

    }

    return curActivityList;

}

 

二、ObjectDataSource 输出参数

经过试验，使用页面所在的类的成员函数，以及Session等均不行，最后，使用页面所在类的静态成员成功！