asp.net中的错误“DropDownList1”有一个无效的SelectedValue ... [英] error in asp.net "DropDownList1' has a SelectedValue which is invalid ...

问题描述

您好我的vs.net 2010 asp.net中有一个网站，有一个gridview和一个sqldatasource，我的代码是：

< / ItemTemplate>

< / asp：TemplateField>

< asp：TemplateField HeaderText =employeeidSortExpression =employeeid>

< EditItemTemplate>

< asp：TextBox ID =TextBox1runat =serverText ='<％＃Bind（employeeid）％>'>< / asp：TextBox>

< / EditItemTemplate>

< ItemTemplate>

< asp：Label ID =Label1runat =serverText ='<％＃Bind （employeeid）％>'>< / asp：标签>

< / ItemTemplate>

< / asp：TemplateField>

< asp：TemplateField HeaderText =nameSortExpression =name>

< E ditItemTemplate>

< asp：TextBox ID =TextBox2runat =serverText ='<％＃Bind（name）％>'>< / asp：TextBox> ;

< / EditItemTemplate>

< ItemTemplate>

< asp：Label ID =Label2runat =serverText ='<％＃Bind（name）％>'>< / asp：Label>

< / ItemTemplate>

< / asp ：TemplateField>

< asp：TemplateField HeaderText =genderSortExpression =gender>

< EditItemTemplate>

< asp：DropDownList ID =DropDownList1runat =serverSelectedValue ='<％＃Bind（gender）％>'>

< asp：listitem> gender< / asp ：listitem>

< asp：listitem>男< / asp：listitem>

< asp：listitem> female< / asp：listitem>

< / asp：DropDownList>

< / EditItemTemplate>

< ; ItemTemplate>

< asp：Label ID =Label3runat =serverText ='<％＃Bind（gender）％>'>< / asp：标签>

< / ItemTemplate>

< / asp：TemplateField>

< asp：TemplateField HeaderText =citySortExpression = city>

< EditItemTemplate>

< asp：TextBox ID =TextBox4runat =serverText ='<％＃Bind（ city）％>'>< / asp：TextBox>

< / EditItemTemplate>

< ItemTemplate>

< ; asp：Label ID =Label4runat =serverText ='<％＃Bind（city）％>'>< / asp：Label> ;

< / ItemTemplate>

< / asp：TemplateField>

Hi I have a web site in vs 2010 asp.net in my form there are a gridview and a sqldatasource and my code is :
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="employeeid" SortExpression="employeeid">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("employeeid") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("employeeid") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="name" SortExpression="name">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("name") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="gender" SortExpression="gender">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" SelectedValue='<%# Bind("gender") %>'>
<asp:listitem>gender</asp:listitem>
<asp:listitem>male</asp:listitem>
<asp:listitem>female</asp:listitem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("gender") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="city" SortExpression="city">
<EditItemTemplate>
<asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("city") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label4" runat="server" Text='<%# Bind("city") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>

推荐答案

SelectedValue属性的值在您的listitem中找不到。假设您获得的选择值为10，但您的下拉列表项中不存在该值。所以你得到了例外。无论你将什么值作为SelectedValue属性，必须出现在你的下拉列表项目中。



尝试如下代码：

The SelectedValue property's value is not found in your listitem. Suppose you are getting selected value "10" but that is not present in your dropdownlist item. So you are getting exception. Whatever you are putting value as SelectedValue property that must be present in your dropdownlist Item.

Try code like below:

<asp:dropdownlist id="DropDownList1" runat="server" selectedvalue="<%# Bind("gender") %>" xmlns:asp="#unknown">	
	<asp:listitem text="gender" value="0"></asp:listitem>
	<asp:listitem text="male" value="1"></asp:listitem>
	<asp:listitem text="female" value="2"></asp:listitem>
</asp:dropdownlist>

这里我使用的值为0,1,2 - 你需要改变你所拥有的从性别列数据中获取。

Here I used value as 0,1,2 - you need to change what ever you are getting from "gender" column data.

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