正在阅读：在 Visual C# .NET 中建立平滑的进度条在 Visual C# .NET 中建立平滑的进度条

public int Maximum { get { return max; } set { 　　　// Make sure that the maximum value is never set lower than the minimum value. if (value < min) { min = value; } max = value; 　　　// Make sure that value is still in range. if (val > max) { val = max; } 　　　// Invalidate the control to get a repaint. this.Invalidate(); } } public int Value { get { return val; } set { int oldValue = val; 　　　// Make sure that the value does not stray outside the valid range. if (value < min) { val = min; } else if (value > max) { val = max; } else { val = value; } 　　　// Invalidate only the changed area. float percent; Rectangle newValueRect = this.ClientRectangle; Rectangle oldValueRect = this.ClientRectangle; 　　　// Use a new value to calculate the rectangle for progress. percent = (float)(val - min) / (float)(max - min); newValueRect.Width = (int)((float)newValueRect.Width * percent); 　　　// Use an old value to calculate the rectangle for progress. percent = (float)(oldValue - min) / (float)(max - min); oldValueRect.Width = (int)((float)oldValueRect.Width * percent); Rectangle updateRect = new Rectangle(); 　　　// Find only the part of the screen that must be updated. if (newValueRect.Width > oldValueRect.Width) { updateRect.X = oldValueRect.Size.Width; updateRect.Width = newValueRect.Width - oldValueRect.Width; } else { updateRect.X = newValueRect.Size.Width; updateRect.Width = oldValueRect.Width - newValueRect.Width; } updateRect.Height = this.Height; 　　　// Invalidate the intersection region only. this.Invalidate(updateRect); } } public Color ProgressBarColor { get { return BarColor; } set { BarColor = value; 　　　// Invalidate the control to get a repaint. this.Invalidate(); } } private void Draw3DBorder(Graphics g) { int PenWidth = (int)Pens.White.Width; g.DrawLine(Pens.DarkGray, new Point(this.ClientRectangle.Left, this.ClientRectangle.Top), new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Top)); g.DrawLine(Pens.DarkGray, new Point(this.ClientRectangle.Left, this.ClientRectangle.Top), new Point(this.ClientRectangle.Left, this.ClientRectangle.Height - PenWidth)); g.DrawLine(Pens.White, new Point(this.ClientRectangle.Left, this.ClientRectangle.Height - PenWidth), new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Height - PenWidth)); g.DrawLine(Pens.White, new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Top), new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Height - PenWidth)); }