'column1'有一个SelectedValue，它是无效的，因为它在项目列表中不存在。参数名称：value [英] 'column1' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value

问题描述

大家好，

我有一个用于保存地址的文本框，但现在它被替换为asp.net中的dropdownlist。

将前一条记录与下拉列表绑定。它给出以下错误： -

 '  column1' 有一个SelectedValue， 无效，因为它不存在  项目的列表。 
参数名称：value 

即标记

 <   td    样式  =  text-align：left >  
 <   asp：DropDownList  < span class =code-attribute>   ID   =  column1    AutoPostBack   =   true    runat   =  server   样式  =  width： 250px  
   
                                            < span class =code-attribute>               OnSelectedIndexChanged   =  column1_SelectedIndexChanged    OnDataBound   =  column1_DataBound  >  
 <   / asp：DropDownList  >  
 <   / td  >  

现在如何解决？

决方案

其中是您的代码值字段。尝试在代码中写入datatext字段和数据值字段。

Hi Everyone,
I had a textbox for saving address but now its being replaced with dropdownlist in asp.net.
While binding the previous record with the dropdownlist.It gives the following error:-

'column1' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

thats the markup

<td style="text-align: left">
                        <asp:DropDownList ID="column1" AutoPostBack="true" runat="server" Style="width: 250px"

                            OnSelectedIndexChanged="column1_SelectedIndexChanged" OnDataBound="column1_DataBound">
                        </asp:DropDownList>
                    </td>

How an it be resolved now?

解决方案

where is the value field on your code. try and write datatext filed and data value field on your code.

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