DataGrid.ItemStyle Proprietà

  • Riferimento

Definizione

Spazio dei nomi:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Ottiene le proprietà di stile degli elementi del controllo DataGrid.

public:
 virtual property System::Web::UI::WebControls::TableItemStyle ^ ItemStyle { System::Web::UI::WebControls::TableItemStyle ^ get(); };
[System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.InnerProperty)]
public virtual System.Web.UI.WebControls.TableItemStyle ItemStyle { get; }
[<System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.InnerProperty)>]
member this.ItemStyle : System.Web.UI.WebControls.TableItemStyle
Public Overridable ReadOnly Property ItemStyle As TableItemStyle

Valore della proprietà

TableItemStyle

Un oggetto TableItemStyle che contiene le proprietà di stile degli elementi del controllo DataGrid. Il valore predefinito è un oggetto TableItemStyle vuoto.

Attributi
PersistenceModeAttribute

Esempio

Nell'esempio di codice seguente viene illustrato come usare la ItemStyle proprietà per impostare il colore di sfondo degli elementi in DataGrid giallo.

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
 <script language="C#" runat="server">
 
    DataTable Cart;
    DataView CartView;
 
    ICollection CreateDataSource() 
    {
       DataTable dt = new DataTable();
       DataRow dr;
 
       dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
       dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
       dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
 
       for (int i = 0; i < 10; i++) 
       {
          dr = dt.NewRow();
 
          dr[0] = i;
          dr[1] = "Item " + i.ToString();
          dr[2] = 1.23 * (i+1);
 
          dt.Rows.Add(dr);
       }
 
       DataView dv = new DataView(dt);
       return dv;
    }
 
    void Page_Load(Object sender, EventArgs e) 
    {
 
       if (!IsPostBack) 
       {
          // Load this data only once.
          ItemsGrid.DataSource= CreateDataSource();
          ItemsGrid.DataBind();
       }
 
    }
 
 </script>
 
 <head runat="server">
    <title>DataGrid Example</title>
</head>
<body>
 
    <form id="form1" runat="server">

       <h3>DataGrid Example</h3>
 
       <asp:DataGrid id="ItemsGrid" runat="server"
            BorderColor="black"
            BorderWidth="1"
            CellPadding="10"
            ShowFooter="true"
            AutoGenerateColumns="true">

          <HeaderStyle BackColor="#00aaaa">
          </HeaderStyle>

          <ItemStyle BackColor="yellow">
          </ItemStyle>

          <FooterStyle BackColor="#00aaaa">
          </FooterStyle>

       </asp:DataGrid>
 
    </form>
 
 </body>
 </html>

<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
 <script language="VB" runat="server">
 
    Dim Cart As DataTable
    Dim CartView As DataView
    
    Function CreateDataSource() As ICollection
        Dim dt As New DataTable()
        Dim dr As DataRow
        
        dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
        dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
        dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
        
        Dim i As Integer
        For i = 0 To 9
            dr = dt.NewRow()
            
            dr(0) = i
            dr(1) = "Item " & i.ToString()
            dr(2) = 1.23 *(i + 1)
            
            dt.Rows.Add(dr)
        Next i
        
        Dim dv As New DataView(dt)
        Return dv
    End Function 'CreateDataSource


    Sub Page_Load(sender As Object, e As EventArgs)
        
        If Not IsPostBack Then
            ' Load this data only once.
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
        End If
    End Sub 'Page_Load 
 
 </script>
 
 <head runat="server">
    <title>DataGrid Example</title>
</head>
<body>
 
    <form id="form1" runat="server">

       <h3>DataGrid Example</h3>
 
       <asp:DataGrid id="ItemsGrid" runat="server"
            BorderColor="black"
            BorderWidth="1"
            CellPadding="10"
            ShowFooter="true"
            AutoGenerateColumns="true">

          <HeaderStyle BackColor="#00aaaa">
          </HeaderStyle>

          <ItemStyle BackColor="yellow">
          </ItemStyle>

          <FooterStyle BackColor="#00aaaa">
          </FooterStyle>

       </asp:DataGrid>
 
    </form>
 
 </body>
 </html>


<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
   <script runat="server">
 
      ICollection CreateDataSource() 
      {
      
         // Create sample data for the DataGrid control.
         DataTable dt = new DataTable();
         DataRow dr;
 
         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
         dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
 
         // Populate the table with sample values.
         for (int i = 0; i < 5; i++) 
         {
            dr = dt.NewRow();
 
            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = 1.23 * (i + 1);
 
            dt.Rows.Add(dr);
         }
 
         DataView dv = new DataView(dt);
         return dv;
      }
 
      void Page_Load(Object sender, EventArgs e) 
      {
 
         // Load sample data only once, when the page is first loaded.
         if (!IsPostBack) 
         {
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();
         }

      }

      void Selection_Change(Object sender, EventArgs e)
      {

         // Set the background color for the items and alternating items in
         // the DataGrid control. Notice that the ItemStyle property affects
         // the even-numbered items, while the AlternatingItemStyle property 
         // affects the odd-numbered items.
         ItemsGrid.ItemStyle.BackColor = 
             System.Drawing.Color.FromName(ItemBackColorList.SelectedItem.Value);
         ItemsGrid.AlternatingItemStyle.BackColor = 
             System.Drawing.Color.FromName(AltItemBackColorList.SelectedItem.Value);

      }

   </script>
 
<head runat="server">
    <title>DataGrid ItemStyle and AlternatingItemStyle Example</title>
</head>
<body>
 
   <form id="form1" runat="server">
 
      <h3>DataGrid ItemStyle and AlternatingItemStyle Example</h3>

      Select background colors for the items and alternating items.

      <br /><br />
 
      <b>Product List</b>
 
      <asp:DataGrid id="ItemsGrid"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           AutoGenerateColumns="False"
           runat="server">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <ItemStyle BackColor="White">
         </ItemStyle>

         <AlternatingItemStyle BackColor="White">
         </AlternatingItemStyle>

         <Columns>

            <asp:BoundColumn DataField="IntegerValue" 
                 HeaderText="Item"/>

            <asp:BoundColumn DataField="StringValue" 
                 HeaderText="Description"/>

            <asp:BoundColumn DataField="CurrencyValue" 
                 HeaderText="Price"
                 DataFormatString="{0:c}">

               <ItemStyle HorizontalAlign="Right">
               </ItemStyle>

            </asp:BoundColumn>
 
         </Columns> 
 
      </asp:DataGrid>

      <hr />

      <table cellpadding="5">

         <tr>

            <td>

               Item BackColor:

            </td>

            <td>

               Alternating item BackColor:

            </td>

         </tr>

         <tr>

            <td>

               <asp:DropDownList id="ItemBackColorList"
                    AutoPostBack="True"
                    OnSelectedIndexChanged="Selection_Change"
                    runat="server">

                  <asp:ListItem Selected="True" Value="White"> White </asp:ListItem>
                  <asp:ListItem Value="Silver"> Silver </asp:ListItem>
                  <asp:ListItem Value="DarkGray"> Dark Gray </asp:ListItem>
                  <asp:ListItem Value="Khaki"> Khaki </asp:ListItem>
                  <asp:ListItem Value="DarkKhaki"> Dark Khaki </asp:ListItem>

               </asp:DropDownList>

            </td>

            <td>

               <asp:DropDownList id="AltItemBackColorList"
                    AutoPostBack="True"
                    OnSelectedIndexChanged="Selection_Change"
                    runat="server">

                  <asp:ListItem Selected="True" Value="White"> White </asp:ListItem>
                  <asp:ListItem Value="Silver"> Silver </asp:ListItem>
                  <asp:ListItem Value="DarkGray"> Dark Gray </asp:ListItem>
                  <asp:ListItem Value="Khaki"> Khaki </asp:ListItem>
                  <asp:ListItem Value="DarkKhaki"> Dark Khaki </asp:ListItem>

               </asp:DropDownList>

            </td>

         </tr>

      </table>
 
   </form>
 
</body>
</html>


<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
   <script runat="server">
 
      Function CreateDataSource() As ICollection 
      
         ' Create sample data for the DataGrid control.
         Dim dt As DataTable = New DataTable()
         Dim dr As DataRow
 
         ' Define the columns of the table.
         dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
         dt.Columns.Add(New DataColumn("StringValue", GetType(string)))
         dt.Columns.Add(New DataColumn("CurrencyValue", GetType(double)))
 
         ' Populate the table with sample values.
         Dim i As Integer

         For i = 0 to 4 
        
            dr = dt.NewRow()
 
            dr(0) = i
            dr(1) = "Item " & i.ToString()
            dr(2) = 1.23 * (i + 1)
 
            dt.Rows.Add(dr)

         Next i
 
         Dim dv As DataView = New DataView(dt)
         Return dv

      End Function
 
      Sub Page_Load(sender As Object, e As EventArgs) 
 
         ' Load sample data only once, when the page is first loaded.
         If Not IsPostBack Then 
  
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()

         End If

      End Sub

      Sub Selection_Change(sender As Object, e As EventArgs)

         ' Set the background color for the items and alternating items in
         ' the DataGrid control. Notice that the ItemStyle property affects
         ' the even-numbered items, while the AlternatingItemStyle property 
         ' affects the odd-numbered items.
         ItemsGrid.ItemStyle.BackColor = _
             System.Drawing.Color.FromName(ItemBackColorList.SelectedItem.Value)
         ItemsGrid.AlternatingItemStyle.BackColor = _
             System.Drawing.Color.FromName(AltItemBackColorList.SelectedItem.Value)

      End Sub

   </script>
 
<head runat="server">
    <title>DataGrid ItemStyle and AlternatingItemStyle Example</title>
</head>
<body>
 
   <form id="form1" runat="server">
 
      <h3>DataGrid ItemStyle and AlternatingItemStyle Example</h3>

      Select background colors for the items and alternating items.

      <br /><br />
 
      <b>Product List</b>
 
      <asp:DataGrid id="ItemsGrid"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           AutoGenerateColumns="False"
           runat="server">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <ItemStyle BackColor="White">
         </ItemStyle>

         <AlternatingItemStyle BackColor="White">
         </AlternatingItemStyle>

         <Columns>

            <asp:BoundColumn DataField="IntegerValue" 
                 HeaderText="Item"/>

            <asp:BoundColumn DataField="StringValue" 
                 HeaderText="Description"/>

            <asp:BoundColumn DataField="CurrencyValue" 
                 HeaderText="Price"
                 DataFormatString="{0:c}">

               <ItemStyle HorizontalAlign="Right">
               </ItemStyle>

            </asp:BoundColumn>
 
         </Columns> 
 
      </asp:DataGrid>

      <hr />

      <table cellpadding="5">

         <tr>

            <td>

               Item BackColor:

            </td>

            <td>

               Alternating item BackColor:

            </td>

         </tr>

         <tr>

            <td>

               <asp:DropDownList id="ItemBackColorList"
                    AutoPostBack="True"
                    OnSelectedIndexChanged="Selection_Change"
                    runat="server">

                  <asp:ListItem Selected="True" Value="White"> White </asp:ListItem>
                  <asp:ListItem Value="Silver"> Silver </asp:ListItem>
                  <asp:ListItem Value="DarkGray"> Dark Gray </asp:ListItem>
                  <asp:ListItem Value="Khaki"> Khaki </asp:ListItem>
                  <asp:ListItem Value="DarkKhaki"> Dark Khaki </asp:ListItem>

               </asp:DropDownList>

            </td>

            <td>

               <asp:DropDownList id="AltItemBackColorList"
                    AutoPostBack="True"
                    OnSelectedIndexChanged="Selection_Change"
                    runat="server">

                  <asp:ListItem Selected="True" Value="White"> White </asp:ListItem>
                  <asp:ListItem Value="Silver"> Silver </asp:ListItem>
                  <asp:ListItem Value="DarkGray"> Dark Gray </asp:ListItem>
                  <asp:ListItem Value="Khaki"> Khaki </asp:ListItem>
                  <asp:ListItem Value="DarkKhaki"> Dark Khaki </asp:ListItem>

               </asp:DropDownList>

            </td>

         </tr>

      </table>
 
   </form>
 
</body>
</html>

Commenti

Utilizzare questa proprietà per fornire uno stile personalizzato per gli elementi del DataGrid controllo. Gli attributi di stile comuni che possono essere modificati includono forecolor, backcolor, font e allineamento del contenuto all'interno della cella. Fornendo uno stile diverso migliora l'aspetto del DataGrid controllo.

Le proprietà dello stile di elemento nel DataGrid controllo vengono ereditate da una proprietà dello stile di elemento a un'altra tramite una gerarchia. Le proprietà dello stile di elemento impostate più in basso nella gerarchia vengono ereditate dalle proprietà dello stile di elemento superiori nella gerarchia. Ad esempio, se si specifica un carattere rosso per la ItemStyle proprietà, tutte le altre proprietà dello stile di elemento nel DataGrid controllo avranno anche un carattere rosso. In questo modo è possibile fornire un aspetto comune per il controllo impostando una singola proprietà di stile elemento. È possibile eseguire l'override delle impostazioni di stile ereditate per una proprietà di stile dell'elemento superiore nella gerarchia impostandone le proprietà di stile. Ad esempio, è possibile specificare un carattere blu per la AlternatingItemStyle proprietà, sostituendo il carattere rosso specificato nella ItemStyle proprietà. La tabella seguente elenca l'ordine della gerarchia dal più alto al più basso.

Precedenza Style, proprietà
1 EditItemStyle
2 SelectedItemStyle
3 AlternatingItemStyle
4 ItemStyle
5 ControlStyle

Per specificare uno stile personalizzato per gli elementi del DataGrid controllo, posizionare i <ItemStyle> tag tra i tag di apertura e chiusura del DataGrid controllo. È quindi possibile elencare gli attributi di stile all'interno del tag di apertura <ItemStyle> .

È anche possibile usare la AlternatingItemStyle proprietà per fornire un aspetto diverso per gli elementi alternativi nel DataGrid controllo.

Si applica a

Vedi anche