WPF WindowsFormsHost control is not woking showing error - wpf

Question

I am using WindowsFormsHost to show DataGridView in my WPF application.
<wfi:WindowsFormsHost Name="winhost" Grid.Row="0" Width="930" Height="200" Margin="5,5,5,0" Visibility="Hidden">
<wf:DataGridView x:Name="dataGridViewOutlookMailList" ScrollBars="Both" AllowUserToAddRows="False" RowHeadersVisible="False" CellContentClick="dataGridViewOutlookMailList_CellContentClick">
<wf:DataGridView.Columns>
<wf:DataGridViewCheckBoxColumn Name="dataGridViewCheckBoxColumn3" HeaderText="" Width="25" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn13" HeaderText="Outlook Entry ID" Width="100" Visible="false" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn14" HeaderText="FullPath With FileName" Width="100" Visible="False" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn15" HeaderText="Resume Name" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn18" HeaderText="Sender Name" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn17" HeaderText="Received By Name" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn16" HeaderText="Received" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn19" HeaderText="Sender Address" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn20" HeaderText="To" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn21" HeaderText="Bcc" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn22" HeaderText="Cc" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn23" HeaderText="Subject" Width="100" Visible="True" />
<wf:DataGridViewTextBoxColumn Name="dataGridViewTextBoxColumn24" HeaderText="Body" Width="100" Visible="True" />
<wf:DataGridViewCheckBoxColumn Name="dataGridViewCheckBoxColumn4" HeaderText="NotesActivity" Width="25" Visible="False" />
<wf:DataGridViewCheckBoxColumn Name="dataGridViewCheckBoxColumn5" HeaderText="Body As Attachment" Width="100" Visible="False" />
</wf:DataGridView.Columns>
</wf:DataGridView>
I am getting following error while mouse over on datagridview also the UI is not loaded properly. see the screen shot for details.
I am also using following code
WinForms.DataGridViewCellStyle ColStyle1 = new WinForms.DataGridViewCellStyle();
System.Drawing.Text.PrivateFontCollection pfc = new System.Drawing.Text.PrivateFontCollection();
pfc.AddFontFile(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + #"\NewZrr\OpenSans-Regular.ttf");
foreach (WinForms.DataGridViewColumn c in dataGridViewOutlookMailList.Columns)
{
c.DefaultCellStyle.Font = new System.Drawing.Font(pfc.Families[0], 8, System.Drawing.FontStyle.Regular);
}
pfc = null;
in my Window_Loaded method to change the font of datagridview. kindly guide me to resolve the issue.

Answer 1

The problem is that the PrivateFontCollection instance in the pfc variable goes out of scope, so when the DataGridViewCell is drawn for the first time the specified font cannot be loaded correctly.
Move the pfc instance outside the Window_Loaded method to prevent GC from collecting it, and do not set it to null, make it a long-living object.
Reference: Parameter is not valid when draw text in label with custom font