编译器错误消息：CS1061：

Question

我有一个下拉列表，必须显示文件夹中的图像文件名，但是当我运行页面出现此错误时：

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

 <%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="ManageProducts.aspx.cs" Inherits="PagesNew_ManagementPages_ManageProducts" %>

错误的标签：

Image:</p>
Line 25:     <p>
Line 26:         <asp:DropDownList ID="ddImage" runat="server" OnSelectedIndexChanged="ddImage_SelectedIndexChanged">
Line 27:         </asp:DropDownList>
Line 28:     </p>

这是整个文件：

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <p>
        Name:</p>
    <p>
        <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
    </p>
    <p>
        Type:</p>
    <p>
        <asp:DropDownList ID="ddType" runat="server" DataSourceID="SqlDataSource1" DataTextField="Name" DataValueField="Id">
        </asp:DropDownList>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT * FROM [ProductTypes] ORDER BY [Name]"></asp:SqlDataSource>
    </p>
    <p>
        Price:</p>
    <p>
        <asp:TextBox ID="txtPrice" runat="server"></asp:TextBox>
    </p>
    <p>
        Image:</p>
    <p>
        <asp:DropDownList ID="ddImage" runat="server" OnSelectedIndexChanged="ddImage_SelectedIndexChanged">
        </asp:DropDownList>
    </p>
    <p>
        Description:</p>
    <p>
        <asp:TextBox ID="txtDescription" runat="server" Height="72px" TextMode="MultiLine" Width="223px"></asp:TextBox>
    </p>
    <p>
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />
    </p>
    <p>
        <asp:Label ID="lblResult" runat="server"></asp:Label>
    </p>
</asp:Content>

我不明白怎么了？

Answer 1

是的，select 下拉菜单，转到其属性，点击事件并双击显示 onSelectedindexChanged 的位置，VS 将创建事件的定义并将您定向到其光标。

在里面写一行简单的代码，看看能不能编译通过。

如果您已经这样做了，在事件上放置一个断点，启用从工具抛出的异常，然后运行通过事件，它应该会为您提供更详细的消息，说明失败的原因。

编译器错误消息：CS1061：

Compiler Error Message: CS1061:

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