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Getting litas of all child controls by type

im trying to create a method that creates a list with the name of all the child elements of the DetalsView that have a type string.

The closest I got:

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"; } }

However, all this happens, repeats once in the first foreach, and then exits (i.e. dv.Controls returns only one element). If I use FindControl, I can go to the elements, but that means I have to do this for each element.

Any plasters?

Thanks!

Edit: here is my DetailsView (I cut out some things that only have more controls to fit the page):

  <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>
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4 answers

try it

  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; } } }

and call

 List<Control> ControlsToCheck = GetAllControls(dv).OfType<Label>().ToList();
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When you iterate through dv.Controls , it only displays the controls at the first level below your DetalsView. You need to iterate through all the child controls, and then their children, etc., if you need to find all the shortcuts.

The answer from @Bala R. is a great example of this. You can also find some examples on this answer .

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I changed the Bala R solution a bit. I made this a universal extension method that only gives you the type of control you're interested in, so you don't need to call .OfType<T> as the second step:

 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 (control is T) yield return descendant as T; } } }

Used as follows:

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

or

 foreach(Label label in dv.GetControls<Label>()) { //do stuff }
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this link helped me, I hope to be appropriate 4 u2;)

http://msdn.microsoft.com/en-us/library/yt340bh4%28v=vs.100%29.aspx

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Source: https://habr.com/ru/post/984789/

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