编译错误 - 您是否缺少using指令或程序集引用？

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我调试程序后，该页面显示我以下错误。我不知道解决这个错误，是缺少程序集？编译错误 - 您是否缺少using指令或程序集引用？

以下是错误的显示：

编译错误

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: 'ASP.dcbrequestlogcriteria_aspx' does not contain a definition for 'ddlTelco_SelectedIndexChanged' and no extension method 'ddlTelco_SelectedIndexChanged' accepting a first argument of type 'ASP.dcbrequestlogcriteria_aspx' could be found (are you missing a using directive or an assembly reference?)

源错误：

<span class="fieldlable">Telco:</span> 
<span> 
<asp:DropDownList ID="ddlTelco" runat="server" DataTextField="Text" DataValueField="Value" AutoPostBack="true" OnSelectedIndexChanged="ddlTelco_SelectedIndexChanged" SelectMethod="LoadTelco" Enabled="false"></asp:DropDownList> 
</span> 
<asp:RequiredFieldValidator ID="RequiredFieldValidatorTelco" runat="server" ErrorMessage="Telco" ControlToValidate="ddlTelco"></asp:RequiredFieldValidator>

来源

2017-01-17 Cheah Eng Teong

错误消息告诉确切的问题是... – VDWWD

这意味着它正在寻找的事件ddlTelco_SelectedIndexChanged您订阅了你的控制

在您的标记背后的代码，定义事件为ddlTelco_SelectedIndexChanged或通过订阅您的控制，以一个事件并产生

ddlTelco.OnSelectedIndexChanged + = ddlTelco_SelectedIndexChanged

protected void ddlTelco_SelectedIndexChanged(object sender, EventArgs e) 
    { 
    //Write implementation here 
    }

并重建。

来源

2017-01-17 08:03:17

您分配了事件处理ddlTelco_SelectedIndexChanged到OnSelectedIndexChanged事件DropDownList的但是你忘了在后端定义它，或者它可能会被删除。

如果你真的想要做的事与OnSelectedIndexChanged定义在后端ddlTelco_SelectedIndexChanged和重建解决方案。如果你不想办法从标记删除OnSelectedIndexChanged

来源

2017-01-17 07:50:12

编译错误 - 您是否缺少using指令或程序集引用？

回答

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