在ASP.NET C＃中未触发onselectedindexchanged下拉列表事件 [英] Onselectedindexchanged event of dropdownlist is not firing in ASP.NET C#

问题描述

我实际上在我的项目中添加了一个下拉列表，然后只是激发了onselectedindexchanged上的事件，我尝试了很多东西来解雇它，

最后我把它绑起来真的不行，请帮帮我..还有一个我在项目中也添加了一个模板。关于那个模板有什么问题吗？



我尝试了什么：



这里是我的代码：

< asp：DropDownList ID =drl1runat =serverOnSelectedIndexChanged =drl1_SelectedIndexChanged>



代码：

if（！IsPostBack）

{

ShowDDL（）;

}



private void ShowDDL（）

{

var size =来自PS的drop.Product_Size

选择新的{PS.Size，PS.Size_Id};

drl1.DataValueField =Size_Id;

drl1.DataTextField =Size;

drl1.DataSource = size.ToList（）;

drl1.DataBind（）;

drl1.Items.Insert（0， - 选择大小 - ）;

}





试试

{

string size = drl1.Selected价值;

var products =（来自PM in drop.PRODUCT_DBM

加入PS in drop.Product_Size on PM.product_size_id等于PS.Size_Id

其中PS.Size == size

选择新的

{

PS.Size

}）;

}

catch（例外情况）

{

}

解决方案

我认为 AutoPostBack =true缺失..



试试这个

 <   asp：DropDownList     ID   =  drl1    AutoPostBack   =  true    runat   =  server    OnSelectedIndexChanged   =  drl1_SelectedIndexChanged >  
 <   / asp：DropDownList  > ;  

I actually added one dropdownlist in my project and then just fired event onselectedindexchanged and i tried a lot to fire it,
at last i tied its really not working please help me.. and one more thing i have added one template also in my project. is there any problem regarding that template?

What I have tried:

here is my code:
<asp:DropDownList ID="drl1" runat="server" OnSelectedIndexChanged="drl1_SelectedIndexChanged" >

CODE:
if (!IsPostBack)
{
ShowDDL();
}

private void ShowDDL()
{
var size = from PS in drop.Product_Size
select new { PS.Size, PS.Size_Id };
drl1.DataValueField = "Size_Id";
drl1.DataTextField = "Size";
drl1.DataSource = size.ToList();
drl1.DataBind();
drl1.Items.Insert(0, "-Select Size-");
}


try
{
string size = drl1.SelectedValue;
var products = (from PM in drop.PRODUCT_DBM
join PS in drop.Product_Size on PM.product_size_id equals PS.Size_Id
where PS.Size == size
select new
{
PS.Size
});
}
catch (Exception ex)
{
}

解决方案

I think AutoPostBack="true" is missing..

try with this

<asp:DropDownList ID="drl1" AutoPostBack="true" runat="server" OnSelectedIndexChanged="drl1_SelectedIndexChanged">
  </asp:DropDownList>

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