VirtualDirectory(String) コンストラクター

定義

名前空間:

System.Web.Hosting

アセンブリ:

System.Web.dll

VirtualDirectory クラスの新しいインスタンスを初期化します。

protected:
 VirtualDirectory(System::String ^ virtualPath);

protected VirtualDirectory (string virtualPath);

new System.Web.Hosting.VirtualDirectory : string -> System.Web.Hosting.VirtualDirectory

Protected Sub New (virtualPath As String)

パラメーター

virtualPath

String

このインスタンスによって表されるリソースへの仮想パス。

例

次のVirtualDirectoryコード例は、カスタム VirtualPathProvider オブジェクトによって提供されるオブジェクトから仮想ファイル情報をDataSet取得するコンストラクターの実装です。 これには、インスタンスの GetData 設定に使用されるメソッドが VirtualDirectory 含まれます。 この例を実行するために必要な完全なコードについては、クラスの概要の「例」セクションを VirtualDirectory 参照してください。

public SampleVirtualDirectory(string virtualDir, SamplePathProvider provider)
  : base(virtualDir)
{
  spp = provider;
  GetData();
}

protected void GetData()
{
  DataSet ds = spp.GetVirtualData();

  // Clean up the path to match data in resource file.
  string path = VirtualPath.Replace(HostingEnvironment.ApplicationVirtualPath, "");
  path = path.TrimEnd('/');

  // Get the virtual directory from the resource table.
  DataTable dirs = ds.Tables["resource"];
  DataRow[] rows = dirs.Select(
    String.Format("(name = '{0}') AND (type='dir')", path));

  // If the select returned a row, the directory exists.
  if (rows.Length > 0)
  {
    exists = true;

    // Get children from the resource table.
    // This technique works for small numbers of virtual resources.
    //   Sites with moderate to large numbers of virtual
    //   resources should choose a method that consumes fewer
    //   computer resources.
    DataRow[] childRows = dirs.Select(
      String.Format("parentPath = '{0}'", path));

    foreach (DataRow childRow in childRows)
    {
      string childPath = (string)childRow["path"];

      if (childRow["type"].ToString() == "dir")
      {
        SampleVirtualDirectory svd = new SampleVirtualDirectory(childPath, spp);
        children.Add(svd);
        directories.Add(svd);
      }
      else
      {
        SampleVirtualFile svf = new SampleVirtualFile(childPath, spp);
        children.Add(svf);
        files.Add(svf);
      }
    }
  }
}

Public Sub New(ByVal virtualDir As String, ByVal provider As SamplePathProvider)
  MyBase.New(virtualDir)
  spp = provider
  GetData()
End Sub

Protected Sub GetData()
  ' Get the data from the SamplePathProvider.
  Dim spp As SamplePathProvider
  spp = CType(HostingEnvironment.VirtualPathProvider, SamplePathProvider)

  Dim ds As DataSet
  ds = spp.GetVirtualData

  ' Clean up the path to match data in resource file.
  Dim path As String
  path = VirtualPath.Replace(HostingEnvironment.ApplicationVirtualPath, "")
  Dim trimChars() As Char = {"/"c}
  path = path.TrimEnd(trimChars)

  ' Get the virtual directory from the resource table.
  Dim dirs As DataTable
  dirs = ds.Tables("resource")
  Dim rows As DataRow()
  rows = dirs.Select( _
    String.Format("(name = '{0}') AND (type='dir')", path))

  ' If the select returned a row, the directory exits.
  If (rows.Length > 0) Then
    existsValue = True

    ' Get the children from the resource table.
    ' This technique works for small numbers of virtual resources.
    '  Sites with moderate to large numbers of virtual
    '  resources should choose a method that consumes fewer
    '  computer resources.
    Dim childRows As DataRow()
    childRows = dirs.Select( _
      String.Format("parentPath = '{0}'", path))

    For Each childRow As DataRow In childRows
      Dim childPath As String
      childPath = CType(childRow("path"), String)

      If (childRow("type").ToString = "dir") Then
        Dim svd As New SampleVirtualDirectory(childPath, spp)
        childrenValue.Add(svd)
        directoriesValue.Add(svd)
      Else
        Dim svf As New SampleVirtualFile(childPath, spp)
        childrenValue.Add(svf)
        directoriesValue.Add(svf)
      End If
    Next

  End If
End Sub

こちらもご覧ください

• VirtualFile