public static string TryCreate(string fileName, out CertFileItem result)
{
try
{
FileInfo file = new FileInfo(fileName);
if (!file.Exists)
{
throw new FileNotFoundException("File not found", fileName);
}
if (file.Length > int.MaxValue)
{
throw new ArgumentException("File too large", "fileName");
}
byte[] data = new byte[(int)file.Length];
using (FileStream stream = file.Open(FileMode.Open, FileAccess.Read))
{
if (stream.Read(data, 0, data.Length) != data.Length)
{
throw new IOException("Not all data retrieved from file");
}
}
result = new CertFileItem(new X509Certificate2(data), file);
return(null);
}
catch (Exception exc)
{
result = null;
return("Error loading certificate from file: " + exc.Message);
}
}
private void openCertFileButton_Click(object sender, EventArgs e)
{
if (openCertificateDialog.ShowDialog(this) == DialogResult.OK)
{
string fileName = openCertificateDialog.FileName;
if (null == (fileName = CertFileItem.TryCreate(fileName, out CertFileItem result)))
{
SelectedCert = result;
}
else
{
MessageBox.Show(this, fileName, "Load Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}