Question

我使用c＃asp-net 4和ef4。

我有一个LINQ查询，它创建一个Anonymuse类型：

var queryRelatedContentsCategories = from cnt in context.CmsContents
                                     from category in cnt.CmsCategories
                                     join c in context.CmsCategories
                                     on cnt.CategoryId equals c.CategoryId
                                     join t in context.CmsTypes
                                     on cnt.TypeContent equals t.TypeContent
                                     join m in context.CmsModes
                                     on cnt.ModeContent equals m.ModeContent
                                     select new
                                     {
                                     cnt.ContentId,
                                     ContentTitle = cnt.Title,
                                     ContentCategoryTitle = c.Title,
                                     ContentCategoryTitleAssociation = category.Title,
                                     ContentIsPublished = cnt.IsPublished,
                                     TypeContentDescription = t.Description,
                                     ModeContentDescription = m.Description
                                     };

GridView与LINQ查询绑定：

<asp:GridView ID="uxManageRelatedContentsCategories" runat="server" AutoGenerateColumns="False"
        OnRowEditing="uxManageRelatedContentsCategories_RowEditing" 
        OnRowCancelingEdit="uxManageRelatedContentsCategories_RowCancelingEdit" 
        onrowupdating="uxManageRelatedContentsCategories_RowUpdating">
        <Columns>
            <asp:CommandField ShowEditButton="True" />
            <asp:BoundField DataField="ContentId" HeaderText="ContentId" ReadOnly="True" />
            <asp:BoundField DataField="ContentTitle" HeaderText="ContentTitle" ReadOnly="True" />
            <asp:BoundField DataField="ContentCategoryTitle" HeaderText="CategoryContentTitle"
                ReadOnly="True" />
            <asp:TemplateField HeaderText="ContentCategoryTitleAssociation">
                <ItemTemplate>
                    <asp:Label ID="uxContentCategoryTitleAssociationDispalyer" runat="server" Text='<%# Eval("ContentCategoryTitleAssociation") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:Label ID="uxContentCategoryTitleAssociationCurrentDispalyer" runat="server" Text='<%# Eval("ContentCategoryTitleAssociation") %>'></asp:Label>

                    <asp:ListBox ID="uxCategoryIdNewSelector" runat="server" DataSourceID="uxEntityDataSourceListCategoriesPublished"
                        DataTextField="Title" DataValueField="CategoryId"></asp:ListBox>
                    <act:ListSearchExtender ID="uxCategoryIdNewSelector_ListSearchExtender" runat="server"
                        Enabled="True" IsSorted="True" QueryPattern="Contains" TargetControlID="uxCategoryIdNewSelector">
                    </act:ListSearchExtender>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidatorListNewCategory" runat="server"
                        ErrorMessage="Title field is required." ControlToValidate="uxCategoryIdNewSelector">*</asp:RequiredFieldValidator>
                </EditItemTemplate>
            </asp:TemplateField>
            <asp:CheckBoxField DataField="ContentIsPublished" HeaderText="ContentIsPublished"
                ReadOnly="True" />
            <asp:BoundField DataField="TypeContentDescription" HeaderText="TypeContentDescription"
                ReadOnly="True" />
            <asp:BoundField DataField="ModeContentDescription" HeaderText="ModeContentDescription"
                ReadOnly="True" />
        </Columns>
        <EmptyDataTemplate>
            Item not found.
        </EmptyDataTemplate>
    </asp:GridView>

直到现在一切正常。

当用户将GridView置于编辑模式时，我需要更改一行。

我的问题是：我无法看到GridView的DataItem，因此我无法检索用户在GridView事件中插入的值：

onrowupdating

据我所知，匿名类型是只读的，目前我使用FindControl和Cell属性从GridView中获取正在编辑的行的值。

// Retrieve the row being edited.
GridViewRow row = uxManageRelatedContentsCategories.Rows[uxManageRelatedContentsCategories.EditIndex];
// Retrieve Value in WebControls
ListBox listCategories = (ListBox)row.FindControl("uxCategoryIdNewSelector");
int myContentId = Convert.ToInt32(row.Cells[1].Text);
int myCategoryIdSelected = Convert.ToInt32(listCategories.SelectedValue);
Label myCurrentCategoryTitleLink = (Label)row.FindControl("uxContentCategoryTitleAssociationCurrentDispalyer");

我的问题：

如何从匿名类型中检索绑定到GridView的值而不查找单元格属性或标签？

很棒的代码示例。谢谢你们照常提供的帮助。

Answer 1

创建一个看起来像您拥有的匿名类型的“ViewModel”类，并使用它。

使用具体的类，您将能够将对象转换为ViewModel并执行您想要执行的任何操作。

如何编辑绑定到具有匿名类型的LINQ查询的GridView中的行

1 个答案: