C# Dispose()釋放順序雜談

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("楷體_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();
        }

     

這樣釋放內存會報 參數無效 異常，經過思索，貌似第一個g對象被釋放掉以后，第二個繪制就會成問題，所以正確寫法應當如下：

public void OnPaint_drawTian(object sender, PaintEventArgs e){...//g.Dispose();}
public void drawWord_first(object sender, PaintEventArgs e){...g.Dispose();}                
請問大家，這樣寫對不，兩個函數緊挨着被調用(注釋掉第一個dispose語句就是了)

另外內存的釋放順序應該與使用的順序相反...

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Dispose與Close沒有任何關系.它們的共同點是遵循一個相似的約定. 
Dispose的約定是,這個方法將釋放該實例所占用的所有資源,銷毀自身. 
注意Dispose的約定是釋放所有資源並銷毀自身,就是說大多數情況下,被Dispose掉的實例都不應該被再次使用. 
如果一個類同時擁有Dispose和Close方法,一般來說,Dispose中都會調用Close方法.

 

 

 

Close   只是關閉而已,沒有釋放真正的釋放資源,可以重新打開 
Dispose   是把對象銷毀,將不再存在 

 

Close是停業整頓，Dispose是炸毀；

 

Close是關門，Dispose是破產。