C# winform 单击按钮防止多次实例化（在线等）
一个单击按钮，希望list中值可以多次添加，但每次单击都会重新实例化，导致智能访问mlist[0]
            List<ImageListshow> mlist=new List<ImageListshow>();
            ImageListshow show1 = new ImageListshow();
            //show1.path = Connection.ConnectionPicture();
            show1.path = Image.FromFile(Connection.ConnectionPicture());
            show1.save = true;
            mlist.Add(show1);
            //pictureBox_get1.Image= mlist[0].path;
            string pictureBox = "pictureBox_get";
            pictureBox = pictureBox + i;
            PictureBox pb1 = (PictureBox)this.Controls.Find(pictureBox, true)[0];
            pb1.Image = mlist[0].path;
------解决方案--------------------
把你的List<ImageListshow> mlist作为成员变量写在你的类里面：
 

class AClass

{ 

    //成员变量

    List<ImageListshow> mlist;

    //构造方法

    AClass()

    {

        List<ImageListshow> mlist=new List<ImageListshow>();

    }

    //其它成员函数

    public void yourMethod()

    {

        mlist=new List<ImageListshow>();

        ImageListshow show1 = new ImageListshow();

        //show1.path = Connection.ConnectionPicture();

        show1.path = Image.FromFile(Connection.ConnectionPicture());

        show1.save = true;

        mlist.Add(show1);

        //pictureBox_get1.Image= mlist[0].path;

        string pictureBox = "pictureBox_get";

        pictureBox = pictureBox + i;

        PictureBox pb1 = (PictureBox)this.Controls.Find(pictureBox, true)[0];

        pb1.Image = mlist[0].path;

    }

}

------解决方案--------------------
List<ImageListshow> mlist=new List<Im