C# Dispose()释放顺序杂谈

public void drawWord_first(object sender, PaintEventArgs e) 
        {
            Graphics gd = e.Graphics;
            //g.SmoothingMode = SmoothingMode.AntiAlias;
            GraphicsPath stringPath = new GraphicsPath();
            charInfo chars=new charInfo();
            string drawWords = chars.getChars();
            stringPath.AddString(chars.getChars(), new FontFamily("楷体_GB2312"), 0, 96, new Point(0, 0), StringFormat.GenericDefault);
            gd.DrawPath(new Pen(Brushes.Blue),stringPath);
            gd.Dispose();

        }

public void OnPaint_drawTian(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            this.tianHeight = 200;
            this.tianWidth = 200;
            this.tianLeftTop = new Point(0,0);
            this.tianRightTop = new Point(this.tianWidth,0);
            this.tianLeftBottom = new Point(0,this.tianHeight);
            this.tianRightBottom = new Point(this.tianWidth,this.tianHeight);
            this.tianTopCenter = new Point(this.tianWidth/2,0);
            this.tianBottomCenter=new Point(this.tianWidth/2,this.tianHeight);
            this.tianLeftCenter = new Point(0,this.tianHeight/2);
            this.tianRightCenter = new Point(this.tianWidth,this.tianHeight/2);

            this.tianRectangle = new Rectangle(this.tianLeftTop,new Size(this.tianWidth,this.tianHeight));
            this.tianPen=new Pen(Brushes.Red,2);
            this.tianPen.DashStyle = DashStyle.DashDot;
            g.DrawLine(this.tianPen, this.tianRectangle.Left, this.tianRectangle.Top, this.tianRectangle.Left + this.tianWidth, this.tianRectangle.Bottom);
            g.DrawLine(this.tianPen,this.tianRightTop,this.tianLeftBottom);
            g.DrawLine(this.tianPen,this.tianLeftCenter,this.tianRightCenter);
            g.DrawLine(this.tianPen,this.tianTopCenter,this.tianBottomCenter);
            this.tianPen.DashStyle = DashStyle.Solid;
            g.DrawRectangle(this.tianPen,this.tianRectangle);
            //g.Dispose();
        }

     

这样释放内存会报 参数无效 异常，经过思索，貌似第一个g对象被释放掉以后，第二个绘制就会成问题，所以正确写法应当如下：

public void OnPaint_drawTian(object sender, PaintEventArgs e){...//g.Dispose();}
public void drawWord_first(object sender, PaintEventArgs e){...g.Dispose();}                
请问大家，这样写对不，两个函数紧挨着被调用(注释掉第一个dispose语句就是了)

另外内存的释放顺序应该与使用的顺序相反...

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Dispose与Close没有任何关系.它们的共同点是遵循一个相似的约定. 
Dispose的约定是,这个方法将释放该实例所占用的所有资源,销毁自身. 
注意Dispose的约定是释放所有资源并销毁自身,就是说大多数情况下,被Dispose掉的实例都不应该被再次使用. 
如果一个类同时拥有Dispose和Close方法,一般来说,Dispose中都会调用Close方法.

 

 

 

Close   只是关闭而已,没有释放真正的释放资源,可以重新打开 
Dispose   是把对象销毁,将不再存在 

 

Close是停业整顿，Dispose是炸毁；

 

Close是关门，Dispose是破产。