如何委派Telerik的网格视图常用的方法是从每个子页从父页面打电话？ [英] How to delegate telerik grid view common methods to be call from parent page from every child page?
问题描述
我使用 Telerik的GridView的显示的记录列表，我比 10页上我用这GridView控件与此以下更在所有这些页面的常见事件代码复制粘贴（有一些小的改动）：
I am using Telerik Gridview for displaying list of records and i have more than 10 pages on which i am using this gridview with this following common events code copy pasted(with some minor changes) on all this pages:
protected void Page_Load(object sender, EventArgs e)
{
DisplayRecords()
}
public void DisplayRecords()
{
//Grid view names are different on different pages.
GridView1.DataSource=Fetching records from database.
GridView1.DataBind();
}
protected void GridView1_SortCommand(object sender, GridSortCommandEventArgs e)
{
DisplayRecords()
}
protected void GridView1_PageIndexChanged(object sender, GridPageChangedEventArgs e)
{
var index = e.NewPageIndex;
DisplayRecords()
}
protected void GridView1_PageSizeChanged(object sender, GridPageSizeChangedEventArgs e)
{
var size = e.NewPageSize;
DisplayRecords()
}
这是我的一个页面从以下继承页：
This is my one page which inherits from following page:
public partial class LoadSettings : ParentPage
{
//Load events and other events
}
[Serializable]
public class ParentPage: RadAjaxPage
{
}
Page 1:**ttt.aspx**
public void DisplayRecords()
{
//Grid view names are different on different pages.
GridView1.DataSource=this.GetAlltttData()
GridView1.DataBind();
}
public DataTable GetAlltttData()
{
using (var context = new MyDataContext())
{
var data = from c in context.ttt select c;
return MyDataContext.LINQToDataTable(data);
}
}
Page 2:**bbb.aspx**
public void DisplayRecords()
{
//Grid view names are different on different pages.
GridView1.DataSource=this.GetAllbbbData()
GridView1.DataBind();
}
public DataTable GetAllbbbData()
{
using (var context = new MyDataContext())
{
var data = from c in context.bbb select c;
return MyDataContext.LINQToDataTable(data);
}
}
protected void rgbbb_SortCommand(object sender, GridSortCommandEventArgs e)
{
DisplayRecords()
}
protected void rgbbb_PageIndexChanged(object sender, GridPageChangedEventArgs e)
{
var index = e.NewPageIndex;
DisplayRecords()
}
protected void rgbbb_PageSizeChanged(object sender, GridPageSizeChangedEventArgs e)
{
var size = e.NewPageSize;
DisplayRecords()
}
所以，这是可能的，我可以把所有此事件在这个 ParentPage 页和刚刚从每一个孩子页面中调用，而不是污染我的每一个页面，这个事件??
So is this possible that i can place all this events in this ParentPage page and just call from every child page instead of polluting my every page with this events??
注意：在我的一些网页此 DisplayRecords 的方法可以包含一些参数，但休息，所有的事件都只是普通
Note:In some of my pages this DisplayRecords methods can contains some parameters but rest all events are just common.
推荐答案
可能是你可以把你常用的逻辑抽象类中与方法（或属性），返回混凝土参考 GridView控件从这个类继承。然后在每一页上你就必须实现该方法。
May be you can put you common logic inside abstract class with method (or property) that returns reference on concrete GridView and inherit from this class. Then on each page your just have to implement that method.
事情是这样的：
public abstract class ParentPage
{
public virtual void DisplayRecords()
{
var gridView = this.GetGridView();
gridView.DataSource = this.GetAllData();
gridView.DataBind();
}
protected abstract DataTable GetAllData();
protected string GetSortOrder()
{
if (this.sortOrder != GridSortOrder.Assending)
return string.Format("{0} DESC", this.sortExpression)
return this.sortExpression;
}
protected void Page_Load(object sender, EventArgs e)
{
DisplayRecords();
}
protected void GridView1_SortCommand(object sender, GridSortCommandEventArgs e)
{
if (!e.Item.OwnerTableView.SortExpressions.ContainsExpression(e.SortExpression))
{
GridSortExpression sortExpr = new GridSortExpression();
sortExpr.FieldName = e.SortExpression;
sortExpr.SortOrder = GridSortOrder.Ascending;
e.Item.OwnerTableView.SortExpressions.AddSortExpression(sortExpr);
}
}
protected void GridView1_PageIndexChanged(object sender, GridPageChangedEventArgs e)
{
e.Item.OwnerTableView.PageIndex = e.NewPageIndex;
DisplayRecords();
}
protected void GridView1_PageSizeChanged(object sender, GridPageSizeChangedEventArgs e)
{
e.Item.OwnerTableView.PageSize = e.NewPageSize;
DisplayRecords();
}
}
Page 1:**ttt.aspx**
public class **tttPage : BasePage
{
protected override GridView GetGridView()
{
//return GridView of this page
return GridView1;
}
protected override DataTable GetAllData()
{
using (var context = new MyDataContext())
{
var data = c in context.ttt select c;
return MyDataContext.LINQToDataTable(data);
}
}
}
Page 1:**bbb.aspx**
public class **bbbPage : BasePage
{
protected override GridView GetGridView()
{
//return GridView of this page
return GridView1;
}
protected override DataTable GetAllData()
{
using (var context = new MyDataContext())
{
var data = c in context.bbb select c;
return MyDataContext.LINQToDataTable(data);
}
}
}
或者你可以把你常用的与虚拟方法的基类的内部逻辑在哪里使用事件参数获取 GridView控件如 e.Item.OwnerTableView 。
这使得它的虚拟，你将能够在任何页面类重写这个逻辑
By making it virtual you will be able to override this logic in any page class
事情是这样的：
public abstract class ParentPage<TEntity>
{
public virtual void DisplayRecords(GridView gridView)
{
gridView.DataSource = this.GetAllData();
gridView.DataBind();
}
protected abstract DataTable GetAllData();
protected void Page_Load(object sender, EventArgs e)
{
DisplayRecords(e.Item.OwnerTableView);
}
protected void GridView_SortCommand(object sender, GridSortCommandEventArgs e)
{
DisplayRecords(e.Item.OwnerTableView);
}
protected void GridView_PageIndexChanged(object sender, GridPageChangedEventArgs e)
{
DisplayRecords(e.Item.OwnerTableView);
}
protected void GridView_PageSizeChanged(object sender, GridPageSizeChangedEventArgs e)
{
DisplayRecords(e.Item.OwnerTableView);
}
}
public class **tttPage : ParentPage
{
protected override DataTable GetAllData()
{
using (var context = new MyDataContext())
{
var data = c in context.ttt select c;
return MyDataContext.LINQToDataTable(data);
}
}
}
public class **bbbPage : ParentPage
{
protected override DataTable GetAllData()
{
using (var context = new MyDataContext())
{
var data = c in context.bbb select c;
return MyDataContext.LINQToDataTable(data);
}
}
}
您也可以使用泛型参数从数据库获取的值。
Also you can use generic parameter for getting values from db.
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