Asp.net Dropdownlist选择的索引已更改

本文介绍了Asp.net Dropdownlist选择的索引已更改的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 亲爱的， i正在编写以下代码。 if（Page.IsPostBack == false） { 试试 { BindSectionDropDownlist（）; BindSubSectionDropDownlist（）; BindSectionLineDropDownlist（）; } catch（例外情况） { Response.Write（"< script language = Javascript> alert（''" + ex.Message.ToString（）+"''）;< / script> ;"）; } } } // BindSectionDropDownList的定义 private void BindSectionDropDownlist（） { DataView dv = new DataView（）; dv = objSectionMaster.GetSectionRecForReports（）; reportCategory_Dropdownlist.DataTextField =" Section Desc"; reportCategory_Dropdownlist.DataValueField =" sectionId"; reportCategory_Dropdownlist.DataSource = dv; reportCategory_Dropdownli st.DataBind（）; reportCategory_Dropdownlist.Items.Insert（0，new ListItem（" - Select - "，" - Select-- "）; //reportCategoty_DropDownList.SelectedIndex=-1; } private void BindSubSectionDropDownlist（） { DataView dv = new DataView（）; dv = objSectionMaster.GetSubSectionRecReports（）; subSection_Dropdownlist.DataTextField =" SectionDesc"; subSection_Dropdownlist.DataValueField =" sectionId"; subSection_Dropdownlist.DataSource = dv; subSection_Dropdownlist.DataBind（ ）; subSection_Dropdownlist.Items.Insert（0，new ListItem（" - Select - "，" - Select - "）） ; //reportCategoty_DropDownList.SelectedIndex=-1; } private void BindSectionLineDropDownlist（） { DataView dv = new DataView（）; dv = objSectionMaster.GetSectionLineR ecReports（）; sectionLineDesc_DropDownList.DataTextField =" Sectio nLineDescription" ;; sectionLineDesc_DropDownList.DataValueField =" SectionLineId"; sectionLineDesc_DropDownList.DataSource = dv; sectionLineDesc_DropDownList.DataBind（）; sectionLineDesc_DropDownList.Items.Insert（0，new ListItem（" - 选择 - "，" -1"））; //reportCategoty_DropDownList.SelectedIndex=-1; } private void search_Button_Click（object sender，System.EventArgs e） { selectQuery（）; } selectQuery（）; { //基于 sectionLineDesc_DropDownList选择 } 前两个下拉列表的选择索引没有改变但是 第三个被选中当我点击搜索时，第三个下拉列表的索引被更改 按钮。 任何帮助将不胜感激。 Dear all , i am writting following code. if(Page.IsPostBack==false){try{ BindSectionDropDownlist();BindSubSectionDropDownlist();BindSectionLineDropDownlist();} catch(Exception ex){Response.Write("<script language=Javascript>alert(''"+ex.Message.ToString()+"'');</script>");}}}// Defination of BindSectionDropDownListprivate void BindSectionDropDownlist(){DataView dv = new DataView();dv = objSectionMaster.GetSectionRecForReports();reportCategory_Dropdownlist.DataTextField="Section Desc";reportCategory_Dropdownlist.DataValueField ="sectionId";reportCategory_Dropdownlist.DataSource=dv;reportCategory_Dropdownlist.DataBind();reportCategory_Dropdownlist.Items.Insert(0,newListItem("--Select--","--Select--")); //reportCategoty_DropDownList.SelectedIndex=-1;}private void BindSubSectionDropDownlist(){DataView dv = new DataView();dv = objSectionMaster.GetSubSectionRecReports();subSection_Dropdownlist.DataTextField="SectionDesc ";subSection_Dropdownlist.DataValueField ="sectionId";subSection_Dropdownlist.DataSource=dv;subSection_Dropdownlist.DataBind();subSection_Dropdownlist.Items.Insert(0,newListItem("--Select--","--Select--")); //reportCategoty_DropDownList.SelectedIndex=-1;}private void BindSectionLineDropDownlist(){ DataView dv = new DataView();dv = objSectionMaster.GetSectionLineRecReports();sectionLineDesc_DropDownList.DataTextField="Sectio nLineDescription";sectionLineDesc_DropDownList.DataValueField ="SectionLineId";sectionLineDesc_DropDownList.DataSource= dv;sectionLineDesc_DropDownList.DataBind(); sectionLineDesc_DropDownList.Items.Insert(0,newListItem("--Select--","-1")); //reportCategoty_DropDownList.SelectedIndex=-1;} private void search_Button_Click(object sender, System.EventArgs e){selectQuery();} selectQuery();{ //Code for further processing of on the basis ofsectionLineDesc_DropDownList selection} selection index of first two dropdownlist is not changed butthe third selected index of third dropdownlist is changedwhen i am click on search button.any help will be greatly appreciated. 推荐答案 这篇关于Asp.net Dropdownlist选择的索引已更改的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！