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FilePicker for WPF allows users to select multiple files at run time, though this option is not selected by default. At run time, users can only select one file at a time by default – you can allow users to select multiple files by setting the Multiselect property to True, for example see the steps below.
To set the Multiselect property add Multiselect="True" to the <c1:C1FilePicker> tag so that it appears similar to the following:
<c1:C1FilePicker Name="C1FilePicker1" Multiselect="True" HorizontalAlignment="Left" Margin="112,36,0,0" VerticalAlignment="Top" Width="161"/>
To set the Multiselect property, add the following code to your project:
Me.C1FilePicker1.Multiselect = True
this.c1FilePicker1.Multiselect = true;.
To set the Multiselect property at design time, complete the following steps:
This will set the Multiselect property to allow users to select multiple files at run time in the OpenFileDialog dialog box.