Assembly assembly = Assembly.GetEntryAssembly();
//不知為什么，上面的有時候不行，可以這樣寫： Assembly assembly = this.GetType().Assembly;
System.IO.Stream stream = assembly.GetManifestResourceStream("OutlookBar.Resources.up.bmp");
//OutlookBar表示命名空間，Resources表示文件夾名稱;
//如查直接放在項目的根目錄下，則寫為： assembly.GetManifestResourceStream("OutlookBar.up.bmp");
Bitmap upImage = (Bitmap)Image.FromStream(stream);

Bitmap upImage = TestProject.up;

if (!File.Exists("TestProject.resources"))
File.Create("TestProject.resources").Dispose();

using (IResourceWriter rw = new ResourceWriter("TestProject.resources"))
{
Image img = Image.FromFile(@"D:/up.bmp");
rw.AddResource("up.bmp", img);
rw.Close();
}

using (ResourceSet rs = new ResourceSet("TestProject.resources"))
{
var image = (Bitmap)rs.GetObject("down.bmp");
pictureBox1.Image = image;
rs.Close();
}