引用System.Windows.Forms(在 system.windows.forms.dll 中) using System.Windows.Forms;
用了的using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Drawing.Drawing2D; using System.Threading;//线程 这些都写了的还是不行
using System.Windows.Forms;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Threading;//线程
这些都写了的还是不行