Question

我正在使用VirtualPathProvider从数据库表中返回虚拟页面，但它一切正常，但问题是该站点不再识别页面物理存在的时间而不是保存在虚拟页面表中。

我正在使用的代码是在页面加载下面调试物理页面时函数FileExists返回false，页面加载失败并且“无法找到资源”。

如何解决这个问题的任何提示都会很棒！感谢

    Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.HtmlControls
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.Hosting

Public Class DbVirtualPathProvider
    Inherits VirtualPathProvider
    Public Shared Sub AppInitialize()
        Dim db As New DbVirtualPathProvider()
        HostingEnvironment.RegisterVirtualPathProvider(db)
    End Sub

    Public Overrides Function FileExists(ByVal virtualPath As String) As Boolean
        Dim strConn As String = ConfigurationManager.ConnectionStrings("connstr").ConnectionString
        Dim cnn As New SqlConnection(strConn)
        cnn.Open()
        Dim cmd As New SqlCommand()
        cmd.Connection = cnn
        cmd.CommandText = "select count(*) from webforms where virtualpath='" & virtualPath & "'"
        Dim retval As Object = cmd.ExecuteScalar()
        cnn.Close()
        Dim i As Integer = Convert.ToInt32(retval)
        If i <= 0 Then
            Return False
        Else
            Return True
        End If
    End Function

    Public Overrides Function GetFile(ByVal virtualPath As String) As VirtualFile
        Dim file As New DbVirtualFile(virtualPath)
        If file.WebFormContent Is Nothing Then
            Return Previous.GetFile(virtualPath)
        Else
            Return file
        End If
    End Function
End Class

Answer 1

查看VirtualPathProvider.Previous财产。 MSDN说，Previous属性获取对编译系统中先前注册的VirtualPathProvider对象的引用。

所以你应该修改一下你的FileExists方法，如：

Dim i As Integer = Convert.ToInt32(retval)
If i <= 0 Then
    Return Previous.FileExists(virtualPath)
Else
    Return True
End If

不应修改

GetFile方法，因为您已在那里使用Previous.GetFile(virtualPath)。

asp.net VirtualPathProvider - 不再识别物理文件

1 个答案: