FileDialog.FilterIndex Property
Gets or sets the index of the filter currently selected in the file dialog box.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Property Value
Type: System.Int32A value containing the index of the filter currently selected in the file dialog box. The default value is 1.
Use the FilterIndex property to set which filtering option is shown first to the user. You can also use the value of FilterIndex after showing the file dialog to perform special file operations depending upon the filter chosen.
Note |
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The index value of the first filter entry is 1. |
The following code example uses the OpenFileDialog implementation of FileDialog and illustrates creating, setting of properties, and showing the dialog box. The example uses the Filter and FilterIndex properties to provide a list of filters for the user. The example requires a form with a Button placed on it and the System.IO namespace added to it.
Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim myStream As Stream = Nothing Dim openFileDialog1 As New OpenFileDialog() openFileDialog1.InitialDirectory = "c:\" openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*" openFileDialog1.FilterIndex = 2 openFileDialog1.RestoreDirectory = True If openFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then Try myStream = openFileDialog1.OpenFile() If (myStream IsNot Nothing) Then ' Insert code to read the stream here. End If Catch Ex As Exception MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message) Finally ' Check this again, since we need to make sure we didn't throw an exception on open. If (myStream IsNot Nothing) Then myStream.Close() End If End Try End If End Sub
Available since 1.1
