在aspx页面中回发后，下拉列表项清除。 [英] Drop down List items getting Cleared after Post back in aspx page.

问题描述

在我的aspx页面中DropdownList Items在页面没有回发（第一次加载）时被绑定，但当我点击任何按钮时（保存，编辑）（所有下拉列表项都被清除。



可以任何一个PLZ帮助，我错过了下拉列表的任何设置。 />


我把

Hi,

In my aspx page the DropdownList Items are getting binded when the page is not post back(first time loading) but when I clicked any button like (save ,edit)( all the drop down List items are getting Cleared.

can any one plz help, am i missing any settings for the dropdown list.

I put

Page.EnableViewState = true;

放在If（！ispostback）上面



If（！IsPostback）

里面的代码是

above the If(!ispostback)

The code inside the If(!IsPostback)
is

Parameters param = new Parameters();
DataSet datasetddlInternetwght = new DataSet();
datasetddlInternetwght = param.GetDDLListInternetWght();
ddlIntrntweight.DataTextField = datasetddlInternetwght.Tables[0].Columns["paramname"].ToString();
ddlIntrntweight.DataValueField = datasetddlInternetwght.Tables[0].Columns["paramvalue"].ToString();
ddlIntrntweight.DataSource = datasetddlInternetwght;
ddlIntrntweight.DataBind();

其中Parameters是单独的.cs文件中的类。我第一次加载页面时收到数据绑定但是当点击任何按钮时，下拉列表中的项目（ddlIntrntweight）将被清除。我为下拉列表启用了View状态;

where Parameters is a class in a separate .cs file. I am getting the Data binded when the Page is loaded for the first time but when any button got clicked the items in the Drop down list(ddlIntrntweight) are getting cleared. i enabled the View state for the Drop down list;

推荐答案

您应该启用视图状态。转到DropdownList的属性并将enableviewstate设置为true。

You should enable view state.Go to properties of the DropdownList and set enableviewstate to true.

请确保以下步骤：



1）将下拉菜单绑定如

Please make sure the follow steps:

1) Bind the drop down like

if (!Page.IsPostBack)
       {
           ddlIntrntweight.DataSource = SqlDataSource1;
           ddlIntrntweight.DataBind();
       }

2）确保

2) Make sure

AutoPostBack="True"

3）确保

3) Make sure

EnableViewState="True";

必须有一些你的代码中的问题。如果你分享你的代码，我将不胜感激....



++ Subhendu

There must be some problem in your code. I would appreciate if you share your code....

++Subhendu

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