如何在ASP.NET中最好地填充HTML表?

时间:2008-09-04 13:54:43

标签: asp.net html vb.net

这就是我所拥有的。有用。但是,有更简单或更好的方法吗?

ASPX Page ...

<asp:Repeater ID="RepeaterBooks" runat="server">
    <HeaderTemplate>
        <table class="report">
            <tr>
                <th>Published</th>
                <th>Title</th>
                <th>Author</th>
                <th>Price</th>
            </tr>
    </HeaderTemplate>
    <ItemTemplate>
            <tr>
                <td><asp:Literal ID="LiteralPublished" runat="server" /></td>
                <td><asp:Literal ID="LiteralTitle" runat="server" /></td>
                <td><asp:Literal ID="LiteralAuthor" runat="server" /></td>
                <td><asp:Literal ID="LiteralPrice" runat="server" /></td>
            </tr>
    </ItemTemplate>
    <FooterTemplate>
        </table>
    </FooterTemplate>
</asp:Repeater>

ASPX.VB代码背后......

Protected Sub Page_Load( ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim db As New BookstoreDataContext
    RepeaterBooks.DataSource = From b In db.Books _
                               Order By b.Published _
                               Select b
    RepeaterBooks.DataBind()
End Sub

Sub RepeaterBooks_ItemDataBound( ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles RepeaterBooks.ItemDataBound
    If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then
        Dim b As Book = DirectCast(e.Item.DataItem, Book)
        DirectCast(e.Item.FindControl("LiteralPublished"), Literal).Text = "<nobr>" + b.Published.ToShortDateString + "</nobr>"
        DirectCast(e.Item.FindControl("LiteralTitle"), Literal).Text = "<nobr>" + TryNbsp(HttpContext.Current.Server.HtmlEncode(b.Title)) + "</nobr>"
        DirectCast(e.Item.FindControl("LiteralAuthor"), Literal).Text = "<nobr>" + TryNbsp(HttpContext.Current.Server.HtmlEncode(b.Author)) + "</nobr>"
        DirectCast(e.Item.FindControl("LiteralPrice"), Literal).Text = "<nobr>" + Format(b.Price, "c") + "</nobr>"
    End If
End Sub

Function TryNbsp(ByVal s As String) As String
    If s = "" Then
        Return "&nbsp;"
    Else
        Return s
    End If
End Function

8 个答案:

答案 0 :(得分:4)

@Geoff

这种Eval语句实际上是在2.0中添加的,但是如果性能很重要,应避免使用Eval,因为它使用了Reflection。

转发器是一种非常好的方法,尽管在代码中生成表可能会更快:

ASPX页面:

<table class="report" id="bookTable" runat="server">
        <tr>
            <th>Published</th>
            <th>Title</th>
            <th>Author</th>
            <th>Price</th>
        </tr>
 </table>

代码背后:

Protected Sub Page_Load( ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not Page.IsPostback Then
        BuildTable()
    End If
End Sub

Private Sub BuildTable()
    Dim db As New BookstoreDataContext
    Dim bookCollection = from b in db.Books _
                         Order By b.Published _
                         Select b
    Dim row As HtmlTableRow
    Dim cell As HtmlTableCell

    For Each book As Books In bookCollection
        row = New HtmlTableRow()
        cell = New HtmlTableCell With { .InnerText = b.Published.ToShortDateString }
        row.Controls.Add(cell)
        cell = New HtmlTableCell With { .InnerText = TryNbsp(HttpContext.Current.Server.HtmlEncode(b.Title)) }
        row.Controls.Add(cell)
        cell = New HtmlTableCell With { .InnerText = TryNbsp(HttpContext.Current.Server.HtmlEncode(b.Author))
        row.Controls.Add(cell)
        cell = New HtmlTableCell With { .InnerText = Format(b.Price, "c") }
        row.Controls.Add(cell)
        bookTable.Controls.Add(row)
    Next

我想这取决于速度对你的重要程度。为了简单起见,我想我会选择Repeater。

答案 1 :(得分:3)

框架3.5引入的ListView控件可能是一个更好的解决方案。你的标记看起来像这样:

<asp:ListView runat="server" ID="ListView1" 
    DataSourceID="SqlDataSource1">
  <LayoutTemplate>
    <table runat="server" id="table1" runat="server" >
      <tr runat="server" id="itemPlaceholder" ></tr>
    </table>
  </LayoutTemplate>
  <ItemTemplate>
    <tr runat="server>
      <td runat="server">
        <asp:Label ID="NameLabel" runat="server" 
          Text='<%#Eval("Name") %>' />
      </td>
    </tr>
  </ItemTemplate>
</asp:ListView>

答案 2 :(得分:2)

在.Net 3.0+中,您可以通过执行以下操作将ItemDataBound替换为asp:Literal:

<ItemTemplate>
            <tr>
                <td><%# Eval("published") %></td>
                ...

其中“已发布”是您绑定到转发器的数据中字段的名称

编辑: @ Alassek:我认为反思的表现经常被过分强调。显然,您需要对应用程序的性能进行基准测试,但Eval的命中率可能以毫秒为单位。除非您的应用程序提供多个并发命中,否则这可能不是问题,使用Eval的代码的简单性,以及它是一个很好的表示分离,使它成为一个很好的解决方案。

答案 3 :(得分:1)

我同意Geoff的观点,我们唯一一次使用Literals是我们想要对数据执行不同的事情。
例如,我们可能希望DueDate字段说“今天”或“昨天”而不是实际日期。

答案 4 :(得分:1)

这就是GridView的用途。

<asp:GridView runat="server" DataSourceID="SqlDataSource1">
   <Columns>
      <asp:BoundField HeaderText="Published" DataField="Published" />
      <asp:BoundField HeaderText="Author" DataField="Author" />
   </Columns>
</asp:GridView>

答案 5 :(得分:1)

我会使用GridView(或DataGrid,如果您使用的是旧版本的ASP.NET)。

<asp:GridView ID="gvBooks" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField HeaderText="Published" DataField="Published" />
        <asp:BoundField HeaderText="Title" DataField="Title" />                     
        <asp:BoundField HeaderText="Author" DataField="Author" />
        <asp:BoundField HeaderText="Price" DataField="Price" />
    </Columns>
</asp:GridView>

使用一些代码隐藏:

Private Sub gvBooksRowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvBooks.RowDataBound
     Select Case e.Row.RowType
        Case DataControlRowType.DataRow

            ''' Your code here '''

     End Select
End Sub

您可以以类似的方式绑定它。 RowDataBound事件就是您所需要的。

答案 6 :(得分:0)

  

ALassek 写道:

     

...在代码中生成表格......

我喜欢那个样子!由于拼写错误或字段名称更改,似乎不太可能产生运行时异常。

答案 7 :(得分:0)

如果你不需要ASP.NET处理编辑功能,我会远离DataGrid和GridView ...它们提供不必要的膨胀