try

{

    System.Reflection.Assembly dll = System.Reflection.Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + "Test.exe");

    ResourceManager resourceManager = new ResourceManager(dll.GetName().Name + ".Properties.Resources", dll);

    object obj = resourceManager.GetObject(picName.Replace('-', '_'));

    if (obj == null) return new Bitmap(, );

    return ((System.Drawing.Bitmap)(obj));

}

catch

{

    throw new ArgumentException("获取图片失败！");

}