asp.net 按类型获取控件的所有子控件

z9zf31ra  于 2023-06-07  发布在  .NET
关注(0)|答案(3)|浏览(234)

我试图使一个方法，创建一个列表的所有子控件的名称DetalsView是类型字符串。
我得到的最接近的是：

foreach (Control c in dv.Controls)
            {
                if (c is Label)
                {
                    controlsToCheck.Add(c.ID);
                }
            }

            foreach (string s in controlsToCheck)
            {
                Label lbl = (Label)dv.FindControl(s);
                if (lbl.Text == "")
                {
                    lbl.Text = "None";
                    lbl.CssClass = "bold";
                }
            }

然而，所有这一切都是在第一个foreach迭代一次，然后退出（即。控件只返回一个项）。如果我使用FindControl，我可以得到的项目，但这意味着我必须这样做的每一个项目。
有什么麻烦吗？
谢谢！
编辑：这是我的DetailsView（我剪了一些东西，其中只是更多的控件，以便它适合页面）：

<asp:DetailsView DefaultMode="ReadOnly" FieldHeaderStyle-CssClass="dwHeader" CssClass="marginLeftRightBottom10px"
            AutoGenerateDeleteButton="true" AutoGenerateEditButton="true" GridLines="None"
            ID="dvIndividualItem" runat="server" AutoGenerateRows="False" DataSourceID="sqldsSingleItem"
            OnDataBound="dvIndividualItem_DataBound">
            <Fields>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Item Name:</h1>
                        <p>
                            The name of the item.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label runat="server" ID="lblItemName" Text='<%# Bind("itemName") %>'></asp:Label>
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox runat="server" ID="tbItemName"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Item Description:</h1>
                        <p>
                            The description of the item.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label runat="server" ID="lblItemDescription" Text='<%# Bind("itemDescription") %>'></asp:Label>
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox runat="server" ID="tbItemDescription"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Item Image:</h1>
                        <p>
                            The image of the item.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Image runat="server" ID="imgItem" Width="40px" Height="40px" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox ReadOnly="true" runat="server" ID="tbItemImage"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Item Type:</h1>
                        <p>
                            Specifies the item type.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblItemType" Text='<%# Eval("itemType") %>' runat="server" />
                    </ItemTemplate>
                    <%--                            <InsertItemTemplate>
                        <asp:DropDownList AutoPostBack="true" OnSelectedIndexChanged="ddlItemTypes_SelectedIndexChanged"
                            DataTextField="itemType" DataValueField="typeId" DataSourceID="sqldsTier1Category"
                            ID="ddlItemTypes" runat="server">
                        </asp:DropDownList>
                        <asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:myDbConnection%>" ID="sqldsTier1Category"
                            runat="server" SelectCommand="dbo.getItemCategories" SelectCommandType="StoredProcedure">
                        </asp:SqlDataSource>
                    </InsertItemTemplate>--%>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Item SubType:</h1>
                        <p>
                            Specifies the sub-item type.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblSubItemType" Text='<%# Eval("itemSubType") %>' runat="server" />
                    </ItemTemplate>
                    <%--                            <InsertItemTemplate>
                        <asp:DropDownList OnDataBound="ddlItemSubTypes_OnDataBound" AutoPostBack="true" DataTextField="itemSubType"
                            DataValueField="subTypeId" DataSourceID="sqldsTier2Category" ID="ddlItemSubTypes"
                            runat="server">
                        </asp:DropDownList>
                        <asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:myDbConnection%>" ID="sqldsTier2Category"
                            runat="server" SelectCommand="dbo.getItemSubCategories" SelectCommandType="StoredProcedure">
                            <SelectParameters>
                                <asp:ControlParameter ControlID="dwNewItem$ddlItemTypes" Name="typeId" PropertyName="SelectedValue"
                                    DbType="Int16" />
                            </SelectParameters>
                        </asp:SqlDataSource>
                    </InsertItemTemplate>--%>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Item SubSubType:</h1>
                        <p>
                            Specifies the sub-sub-item type.</p>
                        <p>
                            <i>Not always applicable.</i></p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblSubSubItemType" Text='<%# Eval("itemSubSubType") %>' runat="server" />
                    </ItemTemplate>
                    <%--                            <InsertItemTemplate>
                        <asp:DropDownList DataTextField="itemSubSubType" DataValueField="subSubTypeId" DataSourceID="sqldsTier3Category"
                            ID="ddlItemSubSubTypes" runat="server">
                        </asp:DropDownList>
                        <asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:myDbConnection%>" ID="sqldsTier3Category"
                            runat="server" SelectCommand="dbo.getItemSubSubCategories" SelectCommandType="StoredProcedure">
                            <SelectParameters>
                                <asp:ControlParameter ControlID="dwNewItem$ddlItemSubTypes" Name="subTypeId" PropertyName="SelectedValue"
                                    DbType="Int16" />
                            </SelectParameters>
                        </asp:SqlDataSource>
                    </InsertItemTemplate>--%>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Requires Sword Swinger Class?</h1>
                        <p>
                            Specifies whether the item can only be used by the Sword Swinger.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="cbReqSwordSwinger" Text='<%# Bind("requiresSwordSwinger") %>' runat="server" />
                    </ItemTemplate>
                    <%--                            <InsertItemTemplate>
                        <asp:CheckBox runat="server" ID="cbReqSwordSwinder" />
                    </InsertItemTemplate>--%>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Requires Rat Catcher Class?</h1>
                        <p>
                            Specifies whether the item can only be used by the Rat Catcher.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="cbReqRatCatcher" Text='<%# Bind("requiresRatCatcher") %>' runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:CheckBox runat="server" ID="cbReqRatCatcher" />
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <h1>
                            Requires Spell Mumbler Class?</h1>
                        <p>
                            Specifies whether the item can only be used by the Spell Mumbler.</p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="cbReqSpellMumbler" Text='<%# Bind("requiresSpellMumbler") %>' runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:CheckBox runat="server" ID="cbReqSpellMumbler" />
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderStyle-CssClass="colorBlue dwHeader">
                    <HeaderTemplate>
                        <h1>
                            Strength permanently added:</h1>
                        <p>
                            Specifies the amount of strength the item permanently adds to your character.</p>
                        <p>
                            <i>Only available when the item is set to type "Consumable"</i></p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblPermanentStrength" Text='<%# Bind("permanentStrength") %>' runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox Enabled="false" runat="server" ID="tbItemPermanentStr"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderStyle-CssClass="colorBlue dwHeader">
                    <HeaderTemplate>
                        <h1>
                            Agility permanently added:</h1>
                        <p>
                            Specifies the amount of agility the item permanently adds to your character.</p>
                        <p>
                            <i>Only available when the item is set to type "Consumable"</i></p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblPermanentAgility" Text='<%# Bind("permanentAgility") %>' runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox Enabled="false" runat="server" ID="tbItemPermanentAgl"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderStyle-CssClass="colorBlue dwHeader">
                    <HeaderTemplate>
                        <h1>
                            Magical Power permanently added:</h1>
                        <p>
                            Specifies the amount of magical power the item permanently adds to your character.</p>
                        <p>
                            <i>Only available when the item is set to type "Consumable"</i></p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblPermanentMagicalPower" Text='<%# Bind("permanentMagicalPower") %>'
                            runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox Enabled="false" runat="server" ID="tbItemPermanentMP"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderStyle-CssClass="colorBlue dwHeader">
                    <HeaderTemplate>
                        <h1>
                            Health Points restored:</h1>
                        <p>
                            Specifies the amount of health points the item restores.</p>
                        <p>
                            <i>Only available when the item is set to type "Consumable"</i></p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblHPRestored" Text='<%# Bind("restoresHealthPoints") %>' runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox Enabled="false" runat="server" ID="tbItemRestoresHp"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderStyle-CssClass="colorBlue dwHeader">
                    <HeaderTemplate>
                        <h1>
                            Mana Points restored:</h1>
                        <p>
                            Specifies the amount of mana points the item restores.</p>
                        <p>
                            <i>Only available when the item is set to type "Consumable"</i></p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblManaRestored" Text='<%# Bind("restoresMana") %>' runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox Enabled="false" runat="server" ID="tbItemRestoresMana"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderStyle-CssClass="colorBlue dwHeader">
                    <HeaderTemplate>
                        <h1>
                            Health Points permanently added:</h1>
                        <p>
                            Specifies the amount of health points the item permanently adds to your character.</p>
                        <p>
                            <i>Only available when the item is set to type "Consumable"</i></p>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblPermanentHP" Text='<%# Bind("permanentHealth") %>' runat="server" />
                    </ItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox Enabled="false" runat="server" ID="tbItemPermanentHP"></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>
            </Fields>
        </asp:DetailsView>
asp.net

3条答案

按热度按时间
dm7nw8vv

dm7nw8vv1#

试试这个

public static IEnumerable<Control> GetAllControls(Control parent)
    {
        foreach (Control control in parent.Controls)
        {
            yield return control;
            foreach (Control descendant in GetAllControls(control))
            {
                yield return descendant;
            }
        }
    }

然后打电话

List<Control> ControlsToCheck = GetAllControls(dv).OfType<Label>().ToList();
赞(0）分享  回复(0）举报  2023-06-07
ssgvzors

ssgvzors2#

我稍微修改了巴拉R的解决方案。我把它变成了一个通用的扩展方法，它只产生你感兴趣的控件类型，所以你不需要在第二步调用.OfType<T>：

public static IEnumerable<T> GetControls<T>(this Control parent) where T : Control
{
    foreach (Control control in parent.Controls)
    {
        if (control is T) yield return control as T;
        foreach (Control descendant in GetControls<T>(control))
        {
            if (descendant is T)
                yield return descendant as T;
        }
    }
}

用法如下：

List<Label> labels = dv.GetControls<Label>().ToList();

或

foreach(Label label in dv.GetControls<Label>())
{
    //do stuff
}
赞(0）分享  回复(0）举报  2023-06-07
vxf3dgd4

vxf3dgd43#

当您迭代dv.Controls时，它只显示DetalsView下第一层的控件。您需要遍历所有子控件，然后遍历其子控件，等等如果你需要找到所有的标签。
答案来自@巴拉R。就是一个很好的例子。您还可以在this answer上找到一些示例。

赞(0）分享  回复(0）举报  2023-06-07
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