LinkButton中使用CommandArgument传递参数

开发中经常需要将值存起来，当点击某一项时以便知道点击了哪一项。这里使用LinkButton的CommandArgument保存参数方式作个小结。

 

一、传递单一参数，注意下边代码中加粗部分:

代码

                         < asp:ListView  ID ="lvWorkFlowList"  runat ="server" >
                             < LayoutTemplate >
                                 < asp:PlaceHolder  runat ="server"  ID ="itemPlaceholder"   />
                             </ LayoutTemplate >
                             < ItemTemplate >
                                 < div  class ="listViewStyle" >                                    
                                     < <asp:LinkButton  ID ="lbnWorkFlowItem"  runat ="server"  OnClick ="lbnWorkFlowItem_Click"
                                        CommandArgument = '<%#((BPM.Foundation.WFDB.WF_Template_V)Container.DataItem).ID  %> '>
                                   < img  src ="../Resources/images/flow_icon.jpg"  alt ="" />  
                                    <% #((BPM.Foundation.WFDB.WF_Template_V)Container.DataItem).templateName %>
                                     </ asp:LinkButton >
                                 </ div >
                             </ ItemTemplate >
                         </ asp:ListView >

二、传递多个参数，使用json形式:

1、在页面上组合json，注意下边代码中加粗部分组合了带两个参数的json形式：

代码

                         < asp:ListView  ID ="lvWorkFlowList"  runat ="server" >
                             < LayoutTemplate >
                                 < asp:PlaceHolder  runat ="server"  ID ="itemPlaceholder"   />
                             </ LayoutTemplate >
                             < ItemTemplate >
                                 < div  class ="listViewStyle" >
                                     < asp:LinkButton  ID ="lbnWorkFlowItem"  runat ="server"  OnClick ="lbnWorkFlowItem_Click"
                                        CommandArgument = '<%#"{TID:\""  + ((BPM.Foundation.WFDB.WF_Template_V)Container.DataItem).templateID + "\",TVer:\""
         + ((BPM.Foundation.WFDB.WF_Template_V)Container.DataItem).templateEdition +"\"}"%> '>  
                         < img  src ="../Resources/images/flow_icon.jpg"  alt =""   />  
<% #((BPM.Foundation.WFDB.WF_Template_V)Container.DataItem).templateName %>
                                     </ asp:LinkButton >
                                 </ div >
                             </ ItemTemplate >
                         </ asp:ListView >

2、在后组合json的形式。

代码

             // 通过循环给每个listview增加json形式的参数
             foreach  (ListViewItem lvItem  in  lvWorkFlowList.Items)
            {
                Control conLinkButton  =  lvItem.FindControl( " lbnWorkFlowItem " );
                 if  (conLinkButton  !=   null )
                {
                    LinkButton lbnItem  =  (LinkButton)conLinkButton;
                     string  sID  =  lbnItem.CommandArgument;
                    var vTemplateItem  =
                        from wfp  in  iWorkflowPowerV
                        .Where(wfp  =>  wfp.ID.ToString()  ==  sID)
                        select  new  { wfp.templateID, wfp.templateEdition, wfp.templateName, wfp.businessType };
                     string  sJson  =   " Dpt:\ " { 0 }\ " ,Dty:\ " { 1 }\ " ,tptID:\ " { 2 }\ " ,tptEdition:\ " { 3 }\ " ,tptName:\ " { 4 }\ " ,tptType:\ " { 5 }\ "" ;
                     foreach  (var vObj  in  vTemplateItem)
                    {
                        sJson  =   string .Format(sJson, sDptId, sDtyId, vObj.templateID.ToString(), vObj.templateEdition.ToString(),
                            vObj.templateName.ToString(), vObj.businessType.ToString());
                        lbnItem.CommandArgument  =   " { "   +  sJson  +   " } " ;
                         break ;
                    }
                }
            }

 

后台调用参数方法：

代码

using  Newtonsoft.Json;   // 调用json类

         protected   void  lbnWorkFlowItem_Click( object  sender, EventArgs e)
        {
             string  sArg  =  ((LinkButton)sender).CommandArgument.ToString();
             // 得到json值
            Newtonsoft.Json.Linq.JObject jJsonObj  =  Newtonsoft.Json.Linq.JObject.Parse(sArg);
             // 得到参数1
             string  sTemplateID  =  ( string )jJsonObj[ " TID " ];
            hfTemplateID.Value  =  sTemplateID;
             // 得到参数2
             string  sTemplateEdition  =  ( string )jJsonObj[ " TVer " ];
            hfTemplateEdition.Value  =  sTemplateEdition;
        }