Question

我遇到了一个棘手的问题，一个ObjectDataSource（绑定到DetailsView）没有检查DeleteParameters的delete方法（我在标记和数据对象中都指定了需要整数）。这是标记：

<asp:ObjectDataSource ID="odsFrontPageBannerDetails" runat="server" DataObjectTypeName="FrontPage.Banner" DeleteMethod="DeleteFrontPageBanner" InsertMethod="InsertFrontPageBanner" SelectMethod="GetFrontPageBanner" UpdateMethod="UpdateFrontPageBanner" TypeName="FrontPage.BannersData">
    <DeleteParameters>
        <asp:Parameter Name="idx" Type="Int32"  />
    </DeleteParameters>
    <SelectParameters>
        <asp:ControlParameter ControlID="GridView1" Name="idx" PropertyName="SelectedValue" Type="Int32" />
    </SelectParameters>
</asp:ObjectDataSource>

和对象：

<DataObjectMethod(DataObjectMethodType.Delete, True)> _
Public Shared Function DeleteFrontPageBanner(ByVal idx As Integer) As Integer
    Dim retval As Integer = 0
    Dim iReturnCode As Integer = 0
    Using conn As New SqlConnection(GetConnStr())
        Using cmd As New SqlCommand
            cmd.CommandType = CommandType.StoredProcedure
            cmd.CommandText = "FrontPage_BannerDelete"
            cmd.Connection = conn
            cmd.Parameters.AddWithValue("@idx", idx)
            Try
                conn.Open()
                iReturnCode = cmd.ExecuteNonQuery
                If iReturnCode >= 0 Then
                    retval = 1
                    LastErrorMsg = String.Empty
                Else
                    Throw New DataException("Return code is: " & iReturnCode)
                End If
            Catch ex As Exception
                LastErrorMsg = ex.Message
                retval = 0
            End Try
        End Using
    End Using
    Return retval
End Function

和detailsview标记：

   <asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" CellPadding="4" DataSourceID="odsFrontPageBannerDetails" ForeColor="#333333" GridLines="None" Height="50px" Width="338px">
        <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
        <CommandRowStyle BackColor="#E2DED6" Font-Bold="True" />
        <EditRowStyle BackColor="#999999" />
        <FieldHeaderStyle BackColor="#E9ECF1" Font-Bold="True" />
        <Fields>
            <asp:BoundField DataField="idx" HeaderText="idx" ReadOnly="True" SortExpression="idx" />
            <asp:CheckBoxField DataField="Active" HeaderText="Active" SortExpression="Active" />
            <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
            <asp:BoundField DataField="BannerText" HeaderText="BannerText" SortExpression="BannerText" />
            <asp:BoundField DataField="BannerImage" HeaderText="Banner Image" SortExpression="BannerImage" />
            <asp:BoundField DataField="BannerLink" HeaderText="Go To Page Link" SortExpression="BannerLink" />
            <asp:BoundField DataField="BackgroundColor" HeaderText="Background Color" SortExpression="BackgroundColor" />
            <asp:BoundField DataField="BannerHeight" HeaderText="Banner Height" HtmlEncode="False" SortExpression="BannerHeight" />
            <asp:BoundField DataField="StartDate" DataFormatString="{0:MM/dd/yyyy}" HeaderText="Start Date" HtmlEncode="False" SortExpression="StartDate" />
            <asp:BoundField DataField="EndDate" DataFormatString="{0:MM/dd/yyyy}" HeaderText="End Date" HtmlEncode="False" SortExpression="EndDate" />
            <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" ShowInsertButton="True" />
        </Fields>
        <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
    </asp:DetailsView>

错误表示DeleteParameters完全被忽略！（我直接从视频教程中看到了一个例子，它对作者来说效果很好）

ObjectDataSource'odsFrontPageBannerDetails'找不到带有参数的非泛型方法'DeleteFrontPageBanner' 输入'FrontPage.Banner'。

有什么想法吗？我试过重建解决方案和页面没有运气！

在尝试了我可以想到的每个参数组合没有成功之后，我决定只更改delete方法以接受Frontpage.Banner对象，现在它删除没有错误 - 请参阅下面的更改：

<DataObjectMethod(DataObjectMethodType.Delete, True)> _
Public Shared Function DeleteFrontPageBanner(ByVal o As FrontPage.Banner) As Integer
    Dim retval As Integer = 0
    Dim iReturnCode As Integer = 0
    Using conn As New SqlConnection(GetConnStr())
        Using cmd As New SqlCommand
            cmd.CommandType = CommandType.StoredProcedure
            cmd.CommandText = "FrontPage_BannerDelete"
            cmd.Connection = conn
            cmd.Parameters.AddWithValue("@idx", o.idx)
            Try
                conn.Open()
                iReturnCode = cmd.ExecuteNonQuery
                If iReturnCode >= 0 Then
                    retval = 1
                    LastErrorMsg = String.Empty
                Else
                    Throw New DataException("Return code is: " & iReturnCode)
                End If
            Catch ex As Exception
                LastErrorMsg = ex.Message
                retval = 0
            End Try
        End Using
    End Using
    Return retval
End Function

仍然希望解释为什么标记中的删除参数被完全忽略。

Answer 1

通常，对象数据源将根据参数名称以任何顺序解析方法，而不检查数据类型。

但是，如果设置了DataObjectTypeName属性，则以不同的方式解析该方法。 ObjectDataSource查找具有在DeleteMethod属性中指定的名称的方法，该属性采用DataObjectTypeName属性中指定的类型的一个参数。在这种情况下，参数的名称无关紧要。

请参阅here

ObjectDataSource找不到带有类型参数的非泛型方法

1 个答案: