使用Repeater的Template

.NET FX提供了一个方法,就是使用Template来在程序运行时对Repeater的显示进行控制.

这里我就不多说了,可以去看MSDN中的相关资料.(嘿嘿,其实我也没搞多少

)..

其实主要是private void lc_DataBinding(object sender, EventArgs e)函数,在DataSource中的数据进行Bind的时候,每Bind一个,都会调用这个函数一次,我们就通过自定义这个函数的实现来完成动态修改格局:)

下面是代码的实现部分:

/// <summary> /// DataControlerType /// </summary> public enum DataControlerType     { /// <summary> /// Repeater /// </summary>         Repeater, /// <summary> /// DataList /// </summary>         DataList, /// <summary> /// DataGrid /// </summary>         DataGrid     }

//     public delegate void DataBinder(object container,Literal lc); /// <summary> /// DataBinder handler. /// </summary> public delegate void TemplateDataBinder( object container,Literal lc, string [] columnnames);

/// <summary> /// Summary description for Template. /// </summary> public class DataTemplateItem : ITemplate     { private ListItemType templateType; private string [] columnNames = null ; private DataControlerType controlType; public TemplateDataBinder mydataBinder = null ;

/// <summary> /// Constructor /// </summary> /// <param name="columnnames"></param> /// <param name="templatetype"></param> /// <param name="controltype"></param> public DataTemplateItem( string [] columnnames,ListItemType templatetype,DataControlerType controltype)         {             templateType = templatetype;             columnNames = columnnames;             controlType = controltype;         }

/// <summary> /// /// </summary> /// <param name="columnnames"></param> /// <param name="templatetype"></param> /// <param name="controltype"></param> /// <param name="dataBinder"></param> public DataTemplateItem( string [] columnnames,ListItemType templatetype,DataControlerType controltype,TemplateDataBinder dataBinder)         {             mydataBinder = dataBinder;             templateType = templatetype;             columnNames = columnnames;             controlType = controltype;         }

/// <summary> /// /// </summary> /// <param name="templatetype"></param> /// <param name="controltype"></param> public DataTemplateItem(ListItemType templatetype,DataControlerType controltype)         {             templateType = templatetype;                controlType = controltype;         }

/// <summary> /// /// </summary> /// <param name="templatetype"></param> /// <param name="controltype"></param> /// <param name="dataBinder"></param> public DataTemplateItem(ListItemType templatetype,DataControlerType controltype,TemplateDataBinder dataBinder)         {             mydataBinder = dataBinder;             templateType = templatetype;                controlType = controltype;         }

public void InstantiateIn(System.Web.UI.Control container)         {             Literal lc = new Literal(); if (mydataBinder == null )             { switch (templateType)                 { case ListItemType.Header:                         lc.Text = " <TABLE><TR> " ; foreach ( string i in columnNames)                         {                             lc.Text += " <TD> " + i + " </TD> " ;                         }                         lc.Text += " </TR> " ; break ; case ListItemType.Footer:                         lc.Text = " </TABLE> " ; break ; case ListItemType.Item: case ListItemType.AlternatingItem:                         lc.DataBinding += new EventHandler(lc_DataBinding); break ;                 }             } else             { switch (templateType)                 { case ListItemType.Header: case ListItemType.Footer:                         mydataBinder(container,lc, this .columnNames); break ; case ListItemType.Item: case ListItemType.AlternatingItem:                         lc.DataBinding += new EventHandler(lc_DataBinding); break ;                 }             }             container.Controls.Add(lc);         }

private void lc_DataBinding( object sender, EventArgs e)         {             Literal lc = (Literal)sender;             Object container; if (controlType == DataControlerType.Repeater)             {                 container = (RepeaterItem)lc.NamingContainer;             } else if (controlType == DataControlerType.DataList)             {                 container = (DataListItem)lc.NamingContainer;                            } else // if(controlType == ControlType.DataGrid)             {                 container = (DataGridItem)lc.NamingContainer;                            } if (mydataBinder == null )             { foreach ( string i in columnNames)                 {                     lc.Text += " <TD> " ;                     lc.Text += DataBinder.Eval(container, " DataItem. " + i);                     lc.Text += " </TD> " ;                 }                 lc.Text += " <TR> " ;             } else             {                 mydataBinder(container,lc,columnNames);             }         }     }

上面的代码中,我定义了一个Delegate TemplateDataBinder ,用来控制显示输出. 使用代码: this.Repeater1.DataSource = reader; this.Repeater1.HeaderTemplate = new ShowDataTemplate(ListItemType.Header,DataControlerType.Repeater,new ShowDataTemplateDelegate(TempHeader)); this.Repeater1.FooterTemplate = new ShowDataTemplate(ListItemType.Footer,DataControlerType.Repeater); this.Repeater1.ItemTemplate = new ShowDataTemplate(ListItemType.Item,DataControlerType.Repeater,new ShowDataTemplateDelegate(TempItem)); this.Repeater1.AlternatingItemTemplate = new ShowDataTemplate(ListItemType.AlternatingItem,DataControlerType.Repeater,new ShowDataTemplateDelegate(TempAlternatingItem)); this.Repeater1.DataBind();

private void TempHeader (object container,Literal lc,string[] columnNames)         { int index = -1;             lc.Text += "<table style=/"BORDER-COLLAPSE: collapse/" borderColor=/"#dcdcdc/" cellSpacing=/"0/" cellPadding=/"4/" rules=/"none/" frame=/"box/"><TR>"; foreach(string i in columnNames)             {                 index++; if(i == "ID"){ continue;                 }                 lc.Text += "<TD class=/"frmHeader/" style=/"BORDER-RIGHT: white 2px solid/" background=/"#dcdcdc/">" + columnShows[index] + "</TD>";             }             lc.Text += "</TR>";         }

private void TempItem (object container,Literal lc,string[] columnNames)         { string id = "";             lc.Text += "<TR>"; foreach(string i in columnNames)             { if(i == "ID"){                     id = (string)DataBinder.Eval(container,"DataItem."+i);; continue;                 }                 lc.Text += "<TD class=/"frmText/">"; if(i == "Modify")                 {                     lc.Text += "<a href=Modify.aspx?ID=" + id + ">修改</a>";                 } else if(i == "Name" || i == "Title"){                     lc.Text += "<a href=View.aspx?ID=" + id + ">" + (string)DataBinder.Eval(container,"DataItem."+i) + "</a>";                 } else{                     lc.Text += DataBinder.Eval(container,"DataItem."+i);                 }                 lc.Text += "</TD>";             }             lc.Text += "</TR>";         }

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