问题
im trying to make a method that creates a List with the name of all the child controls of a DetalsView that are of type string.
The closest i got was:
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 does is iterate once in the first foreach, and then exit (ie. dv.Controls only returns one item). If i use FindControl, i can get to the items, but it means i have to do it for each item.
Any toughts?
Thanks!
Edit: here is my DetailsView (i cut some things out, which where just more controls so it fits on 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>
回答1:
Try this
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();
回答2:
When you are iterating through dv.Controls, it's only showing controls at the first level underneath your DetalsView. You need to iterate through all the child controls, and then their children, etc. if you need to find all the Labels.
The answer by @Bala R. is a great example of this. You can also find some examples on this answer.
回答3:
I modified Bala R's solution a little. I made it a generic extension method that only yeilds the type of control you are interested in so you don't need to call .OfType<T> as a 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 like this:
List<Label> labels = dv.GetControls<Label>().ToList();
or
foreach(Label label in dv.GetControls<Label>())
{
//do stuff
}
回答4:
this link helped me, i hope be befit 4 u2 ;)
http://msdn.microsoft.com/en-us/library/yt340bh4%28v=vs.100%29.aspx
来源：https://stackoverflow.com/questions/7555209/getting-a-lits-of-all-child-controls-of-a-control-by-type