Question

感谢您花时间阅读本文。

我希望执行以下操作，但是它不会在src参数中呈现任何输出：

<asp:ImageButton ID="btnSearch" runat="server" ImageUrl='<%# String.Format("{0}/structure/search_icon.png", MIS.BLL.CommonBLL.Settings.SiteImageURL)%>' CssClass="search_button" />

SiteImageURL是“设置”行中的一列。

非常感谢任何帮助，再次感谢。

Answer 1

好的，我自己想出来，用一个表达式构建器来生成我自己的方法。

CustomBuilder.vb

Namespace test


    Public Class CustomBuilder
        Inherits ExpressionBuilder

        Public Overrides Function GetCodeExpression(entry As BoundPropertyEntry, parsedData As Object, context As ExpressionBuilderContext) As CodeExpression
            Dim type1 As Type = entry.DeclaringType
            Dim descriptor1 As PropertyDescriptor = TypeDescriptor.GetProperties(type1)(entry.PropertyInfo.Name)
            Dim expressionArray1 As CodeExpression() = New CodeExpression(0) {}
            expressionArray1(0) = New CodePrimitiveExpression(entry.Expression.Trim())

            Dim temp As [String] = entry.Expression
            Return New CodeCastExpression(descriptor1.PropertyType, New CodeMethodInvokeExpression(New CodeTypeReferenceExpression(MyBase.[GetType]()), "GenLink", expressionArray1))
        End Function

        Public Shared Function GenLink(link As [String]) As [String]
            Return String.Format("{0}{1}", CommonBLL.Settings.SiteImageURL, link)
        End Function

    End Class
End Namespace

Web.config
    <compilation debug="true" strict="true" targetFramework="4.0">
      <expressionBuilders>
        <add expressionPrefix="GenLink" type="test.CustomBuilder"/>
      </expressionBuilders>      
    </compilation>

page
<asp:ImageButton ID="btnSearch" runat="server" ImageUrl="<%$ GenLink:/structure/search_icon.png %>" CssClass="search_button" />

努力享受！希望这有助于其他人...

imagebutton imageurl不在src中渲染输出

1 个答案: