使用Repeater的Template

.NETFX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
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.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>";
        }

本文来源21aspnet,经授权后由javajgs_com发布,观点不代表Java架构师必看的立场,转载请联系原作者。

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