如何使用数据绑定参数声明地创建RouteUrls？ [英] How to create RouteUrls with databound parameters declaratively?

问题描述

我在ASP.NET 4（Web表单，而不是MVC）中使用新的路由功能。现在我有一个asp：ListView绑定到数据源。其中一个属性是一个 ClientID ，我想用于从ListView项目链接到另一个页面。在 global.asax 我已经定义了一条路线：

  System.Web .Routing.RouteTable.Routes.MapPageRoute（ClientRoute，
MyClientPage / {ClientID}，〜/ Client.aspx）; 
  

所以例如 http：// server / MyClientPage / 2 是一个有效的URL，如果ClientID = 2存在。

在ListView项目中，我有一个asp：HyperLink，以便我可以创建链接： p>

 < asp：HyperLink ID =HyperLinkClientrunat =server
 NavigateUrl ='<％＃ / MyClientPage /+ Eval（ClientID）％>'> 
转到客户详细信息
< / asp：HyperLink> 
  

尽管这样可以使用RouteUrl表达式，但我更愿意使用RouteName而不是硬编码的路由。例如对于常量ClientID = 2，我可以写：

 < asp：HyperLink ID =HyperLinkClientrunat =server 
 NavigateUrl =<％$ RouteUrl：ClientID = 2，RouteName = ClientRoute％> > 
转到客户详细信息
< / asp：HyperLink> 
  

现在我想知道我是否可以组合路由表达式语法和数据绑定语法。基本上我喜欢用<％＃Eval（ClientID）％> 替换常量 2 。但是以一种天真的方式这样做...

 < asp：HyperLink ID =HyperLinkClientrunat =server
 NavigateUrl ='<％$ RouteUrl：ClientID =<％＃Eval（ClientID）％>，RouteName = ClientRoute％>'> 
转到客户详细信息
< / asp：HyperLink> 
  

...不工作：<％＃Eval（ClientID ）％> 未被评估，但被视为字符串。使用多种引号的玩法也没有帮助到目前为止（大多数情况下解析器错误）。

问题：是否可能在所有我试图在这里实现？如果是的话，那是正确的方法？

提前谢谢！

解决方案>

使用 System.Web.UI.Control.GetRouteUrl ：

VB：

 < asp：HyperLink ID =HyperLinkClient runat =server
 NavigateUrl ='<％＃GetRouteUrl（ClientRoute，New with {.ClientID = Eval（ClientID）}）％>'> 
转到客户详细信息
< / asp：HyperLink> 
  

C＃：

 code>< asp：HyperLink ID =HyperLinkClientrunat =server
 NavigateUrl ='<％＃GetRouteUrl（ClientRoute，新{ClientID = Eval（ClientID）}）％ >'> 
转到客户详细信息
< / asp：HyperLink> 
  

I'm using the new Routing feature in ASP.NET 4 (Web forms, not MVC). Now I have an asp:ListView which is bound to a datasource. One of the properties is a ClientID which I want to use to link from the ListView items to another page. In global.asax I have defined a route:

System.Web.Routing.RouteTable.Routes.MapPageRoute("ClientRoute",
    "MyClientPage/{ClientID}", "~/Client.aspx");

so that for instance http://server/MyClientPage/2 is a valid URL if ClientID=2 exists.

In the ListView items I have an asp:HyperLink so that I can create the link:

<asp:HyperLink ID="HyperLinkClient" runat="server" 
    NavigateUrl='<%# "~/MyClientPage/"+Eval("ClientID") %>' >
    Go to Client details
</asp:HyperLink>

Although this works I would prefer to use the RouteName instead of the hardcoded route by using a RouteUrl expression. For instance with a constant ClientID=2 I could write:

<asp:HyperLink ID="HyperLinkClient" runat="server" 
    NavigateUrl="<%$ RouteUrl:ClientID=2,RouteName=ClientRoute %>" >
    Go to Client details
</asp:HyperLink>

Now I am wondering if I can combine the route expression syntax and the databinding syntax. Basically I like to replace the constant 2 above by <%# Eval("ClientID") %>. But doing this in a naive way...

<asp:HyperLink ID="HyperLinkClient" runat="server" 
    NavigateUrl='<%$ RouteUrl:ClientID=<%# Eval("ClientID") %>,RouteName=ClientRoute %>' >
    Go to Client details
</asp:HyperLink>

... does not work: <%# Eval("ClientID") %> is not evaluated but considered as a string. Playing around with several flavors of quotation marks also didn't help so far (Parser errors in most cases).

Question: Is it possible at all what I am trying to achieve here? And if yes, what's the correct way?

Thank you in advance!

解决方案

Use System.Web.UI.Control.GetRouteUrl:

VB:

<asp:HyperLink ID="HyperLinkClient" runat="server"  
    NavigateUrl='<%# GetRouteUrl("ClientRoute", New With {.ClientID = Eval("ClientID")}) %>' > 
    Go to Client details 
</asp:HyperLink>

C#:

<asp:HyperLink ID="HyperLinkClient" runat="server"  
    NavigateUrl='<%# GetRouteUrl("ClientRoute", new {ClientID = Eval("ClientID")}) %>' > 
    Go to Client details 
</asp:HyperLink>

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