在DataList里面怎么判断一个值？？急急！在线等待

[fslhj]

如：
<asp:DataList id="DataList1" runat="server"
RepeatDirection="Horizontal"
RepeatColumns="2">
<ItemTemplate>
<%# Container.DataItem("content")%>
<br>
</ItemTemplate>
</ASP:Datalist>

我想当字段“content”的值为“no”时显示“发表”
当该值不为“no”时显示<%# Container.DataItem("content")%>

该怎么作判断呢？
请高手指点

在线......

[OK521]

在这里用label控件来代替，在后台程序中用datareader来判断

[fslhj]

这里涉及到一个分页问题，这样做很不方便呀。

[fslhj]

而且需要读取的数据是多行，label是不能存在于DataList控件里面的

[garth]

可以在itemdatabind事件中判断("content")的值
然后用label控件显示相应的值

[garth]

可以阿，用摸板列什么不能放阿

[saucer]

add a method

string GetValue (object o)
{
if (o == null || o == DBNull.Value)
return "";

if (o.ToString().ToLower() == "no")
return "发表";

return o.ToString();
}


<%# GetValue(Container.DataItem("content"))%>


or

<%# Container.DataItem("content").ToString().ToLower() == "no" ? "发表" : Container.DataItem("content").ToString() %>

[kinglht]

同意楼上！！

[dragontt]

这是数据绑定的介绍

当在 ASP.NET 页上调用 DataBind 方法时，数据绑定表达式在该页上的任何属性（包括服务器控件属性）和数据源之间创建绑定。可以将数据绑定表达式包含在服务器控件开始标记中属性/值对的值侧，或页中的任何位置。

<tagprefix:tagname property="<%# data-binding expression %> runat="server" />
或

literal text <%# data-binding expression %>


要达到你的要求，只有一个办法，再绑定之前将数据处理一次
因为<%# data-binding expression %>中不支持写表达式

如果有更好的方法，欢迎指教
：）

[dragontt]

呵呵
我很佩服我自己呢
这样写就可以了
<%# (((Container.DataItem("content")=="no")?"发表":Container.DataItem("content")).ToString()%>

[dragontt]

不好意思，楼上的各位
我没看思归老大的回答
5555555555555

[fslhj]

saucer(思归, MS .NET MVP) 的方法可行，
不过好象在“VB”在行不通。
如：
<script language="VB" runat=server>

public sub tocontent(content as object)
Dim strcontent as string= content.ToString()
if (strcontent = "no") then
content="[提供]"
else
content=strcontent
end if
end sub
</script>

<asp:DataList id="DataList1" runat="server"
RepeatDirection="Horizontal"
RepeatColumns="2">
<ItemTemplate>
<%# tocontent(Container.DataItem("content"))%><br>
</ItemTemplate>
</ASP:Datalist>

错误：
E:\master\fm1949.com\music\music\index1.aspx(302) : error BC30518: Overload resolution failed because no accessible 'ToString' can be called with these arguments:
'Public Shared Overloads Function ToString(value As String) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Date) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Decimal) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Double) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Single) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As System.UInt64) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Long) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As System.UInt32) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Integer) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As System.UInt16) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Short) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Byte) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As System.SByte) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Char) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Boolean) As String': Expression does not produce a value.
'Public Shared Overloads Function ToString(value As Object) As String': Expression does not produce a value.

target.SetDataBoundString(8, System.Convert.ToString(tocontent(Container.DataItem("content"))))
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[fslhj]

问题已解决：
将上面的
public sub tocontent(content as object)
Dim strcontent as string= content.ToString()
if (strcontent = "no") then
content="[提供]"
else
content=strcontent
end if
end sub

改成：
function tocontent(content as object)
Dim strcontent as string= content.ToString()
if (strcontent = "no") then
content="[提供]"
else
content=strcontent
end if
end function
即可

非常感谢谢各位

[jmsofts]

gz