FormView 中的 ASP.NET DropDownList

Question

一直在处理 ASP.NET 表单，并且在某个特定部分上苦苦挣扎。我正在使用带有指向存储过程的插入函数的 SqlDataSource，并带有一些输入参数。我有一个 FormView 设置。我希望表单的输入字段之一是 DropDownList，其选项是从不同的 SqlDataSource 填充的。作为参考，这里是formview：

<asp:FormView runat="server" id="FormView1" DataSourceID="SqlDataSource1" DefaultMode="Insert">
    <EditItemTemplate>
        refund_ach:
        <asp:CheckBox Checked='<%# Bind("ach") %>' runat="server" id="refund_achCheckBox" />
        <br />
        refund_dba_name:
        <asp:TextBox Text='<%# Bind("dbaname") %>' runat="server" id="refund_dba_nameTextBox" />
        <br />
        refund_mid:
        <asp:TextBox Text='<%# Bind("mid") %>' runat="server" id="refund_midTextBox" />
        <br />
        refund_description:
        <asp:TextBox Text='<%# Bind("description") %>' runat="server" id="refund_descriptionTextBox" />
        <br />
        refund_amount:
        <asp:TextBox Text='<%# Bind("amount") %>' runat="server" id="refund_amountTextBox" />
        <br />
        refund_type:
        <asp:TextBox Text='<%# Bind("type") %>' runat="server" id="refund_typeTextBox" />
        <br />
        <asp:LinkButton runat="server" Text="Update" CommandName="Update" id="UpdateButton" CausesValidation="True" />&nbsp;
        <asp:LinkButton runat="server" Text="Cancel" CommandName="Cancel" id="UpdateCancelButton" CausesValidation="False" />
    </EditItemTemplate>
    <InsertItemTemplate>
        <asp:Table runat="server" id="Table1">
            <asp:TableRow>
                <asp:TableCell>ACH?:
                </asp:TableCell>
                <asp:TableCell><asp:CheckBox Checked='<%# Bind("ach") %>' runat="server" id="refund_achCheckBox" />
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow>
                <asp:TableCell>DBA Name:
                </asp:TableCell>
                <asp:TableCell><asp:TextBox Text='<%# Bind("dbaname") %>' runat="server" id="refund_dba_nameTextBox" />
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow>
                <asp:TableCell>MID:
                </asp:TableCell>
                <asp:TableCell><asp:TextBox Text='<%# Bind("mid") %>' runat="server" id="refund_midTextBox" />
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow>
                <asp:TableCell>Description:
                </asp:TableCell>
                <asp:TableCell><asp:TextBox Text='<%# Bind("description") %>' runat="server" id="refund_descriptionTextBox" />
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow>
                <asp:TableCell>Amount:
                </asp:TableCell>
                <asp:TableCell><asp:TextBox Text='<%# Bind("amount") %>' runat="server" id="refund_amountTextBox" />
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow>
                <asp:TableCell>Type:
                </asp:TableCell>
                <asp:TableCell><asp:DropDownList DataSourceID="SqlDataSource2" SelectedValue='<%# Bind("type") %>' DataTextField="Reason" DataValueField="ID" runat="server" id="refund_typeTextBox" />
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
                    <asp:LinkButton runat="server" Text="Insert" CommandName="Insert" id="InsertButton" CausesValidation="True" />&nbsp;
        <asp:LinkButton runat="server" Text="Cancel" CommandName="Cancel" id="InsertCancelButton" CausesValidation="False" />
    </InsertItemTemplate>
    <ItemTemplate>
        refund_ach:
        <asp:CheckBox Checked='<%# Bind("ach") %>' runat="server" id="refund_achCheckBox" Enabled="false" />
        <br />
        refund_dba_name:
        <asp:Label Text='<%# Bind("dbaname") %>' runat="server" id="refund_dba_nameLabel" />
        <br />
        refund_mid:
        <asp:Label Text='<%# Bind("mid") %>' runat="server" id="refund_midLabel" />
        <br />
        refund_description:
        <asp:Label Text='<%# Bind("description") %>' runat="server" id="refund_descriptionLabel" />
        <br />
        refund_amount:
        <asp:Label Text='<%# Bind("amount") %>' runat="server" id="refund_amountLabel" />
        <br />
        refund_type:
        <asp:Label Text='<%# Bind("type") %>' runat="server" id="refund_typeLabel" />
        <br />
    </ItemTemplate>
</asp:FormView>

这里是 SqlDataSource：

    <asp:SqlDataSource runat="server" id="SqlDataSource1" ProviderName="System.Data.SqlClient" ConnectionString="Data Source=myserver;Initial Catalog=mydatabase;Persist Security Info=True;User ID=mysvcaccount;Password=NOPE!;" SelectCommand="SELECT [refund_ach], [refund_dba_name], [refund_mid], [refund_description], [refund_amount], [refund_type] FROM [refund]" InsertCommand="EXEC usp_refund_insert @user, @ach, @dbaname, @mid, @description, @amount, @type">
    <InsertParameters>
        <asp:formparameter FormField="refund_achCheckBox" Name="ach" Type="Boolean" />
        <asp:formparameter FormField="refund_amountTextBox" Name="amount" Type="Decimal" />
        <asp:formparameter FormField="refund_dba_nameTextBox" Name="dbaname" Type="String" />
        <asp:formparameter FormField="refund_descriptionTextBox" Name="description" Type="String" />
        <asp:formparameter FormField="refund_midTextBox" Name="mid" Type="String" />
        <asp:formparameter FormField="refund_typeTextBox" Name="type" Type="Int32" />
        <asp:parameter DefaultValue="dfsdf" Name="user" Type="String" />
    </InsertParameters>
</asp:SqlDataSource>

数据很好地填充在 DDL 中（来自另一个 SqlDataSource）。所有需要的选项都会出现。但是在提交表单时，我收到一个错误。我删除了 DDL 并为该参数硬编码了一个值，它执行得很好。我花了最后几个小时在互联网上搜寻解决方案，找到了很多，尝试了它们，但没有任何运气。我是一名 DBA，所以 .NET 不是我的强项，但让 DDL 像这样工作似乎并不难。

Answer 1

哇。在非常沮丧之后，我决定从头开始，再试一次，只是为了确保我没有错过任何东西。我构建的所有东西都完全相同，减去所有表格元素......而且效果很好。我添加了表格元素，停止工作。再次删除它们：有效。

不知道为什么，也许精通 .NET 的人可以解释原因，但它确实解决了我的问题。