为.net中的ListBox控件添加双击事件

         我在用dotnet做一个项目的过程中，遇到了一个ListBox的问题：通过在一个ListBox中双击，把选中的项添加到另一个ListBox中，但ListBox控件本身并没有该事件，那么如何实现呢？我就想到了客户端脚本javascrit,通过查阅相关资料,终于把这个问题解决了，现在写出来与大家分享，希望能对大家有所帮助。

        这里有三个问题：

        第一：双击所要执行的javascript代码是什么？

                    注意：javascript代码的语法要正确，即每一行都要以“；”结尾；

                    function change()

                        {

                             var addOption=document.createElement("option");

                             var index1;

                             if(document.Form1.ListBox1.length==0)return(false);

                              index1=document.Form1.ListBox1.selectedIndex;

                             if(index1<0)return(false);

                              addOption.text=document.Form1.ListBox1.options(index1).text;

                              addOption.value=document.Form1.ListBox1.value;

                             document.Form1.ListBox2.add(addOption);

                             document.Form1.ListBox1.remove (index1);

                         }

        第二：如何将 javascript 代码转换为C#代码？

                    public static void ListBox_DblClick(Page page,System.Web.UI.WebControls.WebControl webcontrol,string                                 SourceControlName,string TargetControlName)

                     {

                           SourceControlName = "document.Form1." +  SourceControlName;

                           TargetControlName = "document.Form1." +  TargetControlName;

                           string js = "<script language=javascript> function change(SourceControlName,TargetControlName)";

                           js += "{";

                           js +=     "var addOption=document.createElement('option'); \n";

                           js += "  var index1; \n";

                           js += "if(SourceControlName.length==0)return(false);\n";

                           js += "  index1=SourceControlName.selectedIndex; \n ";

                           js += "  if(index1<0)return(false);\n";

                           js += " addOption.text=SourceControlName.options(index1).text; \n";

                           js += "addOption.value=SourceControlName.value; \n";

                           js += "TargetControlName.add(addOption); \n";

                           js += "SourceControlName.remove (index1) \n";

                           js +="}";

                           js += "</script>";

                            //注册该 javascript ；

                           page.RegisterStartupScript("",js);

                            //为控件添加双击事件；

                           webcontrol.Attributes.Add("onDblClick","change(" + SourceControlName + "," + TargetControlName     +                                 ");");

                      }

                    在该方法中,SourceControlName是要绑定双击事件的控件，TargetControlName是接收双击事件选定项的控件。   

                    这里有一个问题，如何让对象作为参数传给javascript的change函数，我这里采用的是用  SourceControlName  ,TargetControlName 来传递两个ListBox的Name, 然后与“document.Form1.“组合成一个串来传递给javascript的change函数，即

                            SourceControlName = "document.Form1." +  SourceControlName;

                           TargetControlName = "document.Form1." +  TargetControlName;

        第三：如何为控件添加双击事件？

                    用ControlName.Attributes.Add(“属性名称”，“函数名称或代码”);