/// <summary>
/// Removes the association of the specifed file type with the client.
/// </summary>
/// <param name="p_fasFileAssociation">The description of the file type association to remove.</param>
/// <exception cref="InvalidOperationException">Thrown if the user does not have sufficient priviledges
/// to remove the association.</exception>
protected void UnassociateFile(FileAssociationSetting p_fasFileAssociation)
{
if (!UacUtil.IsElevated)
throw new InvalidOperationException("You must have administrative privileges to change file associations.");
string strFileId = p_fasFileAssociation.Extension.TrimStart('.').ToUpperInvariant() + "_File_Type";
string[] strKeys = Registry.ClassesRoot.GetSubKeyNames();
if (Array.IndexOf<string>(strKeys, strFileId) != -1)
{
Registry.ClassesRoot.DeleteSubKeyTree(strFileId);
Registry.ClassesRoot.DeleteSubKeyTree(p_fasFileAssociation.Extension);
}
}
/// <summary>
/// Associates the specifed file type with the client.
/// </summary>
/// <param name="p_fasFileAssociation">The description of the file type association to create.</param>
/// <exception cref="InvalidOperationException">Thrown if the user does not have sufficient priviledges
/// to create the association.</exception>
protected void AssociateFile(FileAssociationSetting p_fasFileAssociation)
{
if (!UacUtil.IsElevated)
throw new InvalidOperationException("You must have administrative privileges to change file associations.");
string strFileId = p_fasFileAssociation.Extension.TrimStart('.').ToUpperInvariant() + "_File_Type";
try
{
Registry.SetValue(@"HKEY_CLASSES_ROOT\" + p_fasFileAssociation.Extension, null, strFileId);
Registry.SetValue(@"HKEY_CLASSES_ROOT\" + strFileId, null, p_fasFileAssociation.Description, RegistryValueKind.String);
Registry.SetValue(@"HKEY_CLASSES_ROOT\" + strFileId + @"\DefaultIcon", null, Application.ExecutablePath + ",0", RegistryValueKind.String);
Registry.SetValue(@"HKEY_CLASSES_ROOT\" + strFileId + @"\shell\open\command", null, "\"" + Application.ExecutablePath + "\" \"%1\"", RegistryValueKind.String);
}
catch (UnauthorizedAccessException)
{
throw new InvalidOperationException("Something (usually your antivirus) is preventing the program from interacting with the registry and changing the file associations.");
}
}