winform的从绘问题???????????????????

[superfishmanweb]

我用一个winform做了一个进度条,可是在弹出窗体的时候变成了一堆白色.之后想到用repaint,可是找不到,后来就用了Invalidate(); 但是还是没有效果.问题如何解决.具体情况如下:
form1访问连接数据库时候修改一个bool值并弹出带进度条的窗体,之后再访问数据库完毕后另bool起变化从而关闭进度条所在的窗口.就是在这个过程中弹出窗口变成了一陀白色的矩行.

[zdq801104]

用户控件代码：
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace SmoothProgressBar
{
/// <summary>
/// UserControl1 的摘要说明。
/// </summary>
public class UserControl1 : System.Windows.Forms.UserControl
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public UserControl1()
{
// 该调用是 Windows.Forms 窗体设计器所必需的。
InitializeComponent();

// TODO: 在 InitComponent 调用后添加任何初始化

}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
///
int min = 0; // Minimum value for progress range
int max = 100; // Maximum value for progress range
int val = 0; // Current progress
Color BarColor = Color.Blue; // Color of progress meter

protected override void OnResize(EventArgs e)
{
// Invalidate the control to get a repaint.
this.Invalidate();
}

protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
SolidBrush brush = new SolidBrush(BarColor);
float percent = (float)(val - min) / (float)(max - min);
Rectangle rect = this.ClientRectangle;

// Calculate area for drawing the progress.
rect.Width = (int)((float)rect.Width * percent);

// Draw the progress meter.
g.FillRectangle(brush, rect);

// Draw a three-dimensional border around the control.
Draw3DBorder(g);

// Clean up.
brush.Dispose();
g.Dispose();
}

public int Minimum
{
get
{
return min;
}

set
{
// Prevent a negative value.
if (value < 0)
{
min = 0;
}

// Make sure that the minimum value is never set higher than the maximum value.
if (value > max)
{
min = value;
min = value;
}

// Ensure value is still in range
if (val < min)
{
val = min;
}

// Invalidate the control to get a repaint.
this.Invalidate();
}
}

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));
}

protected override void Dispose( bool disposing )
{
if( disposing )
{
if( components != null )
components.Dispose();
}
base.Dispose( disposing );
}

#region 组件设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器
/// 修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
//
// UserControl1
//
this.BackColor = System.Drawing.Color.IndianRed;
this.Name = "UserControl1";
this.Size = new System.Drawing.Size(150, 40);

}
#endregion
}
}

[zdq801104]

控件使用：
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using SmoothProgressBar;
namespace WindowsApplication2
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Timer timer1;
private System.Windows.Forms.Button button1;
private SmoothProgressBar.UserControl1 smoothProgressBar1;
private SmoothProgressBar.UserControl1 smoothProgressBar2;
private System.ComponentModel.IContainer components;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.timer1 = new System.Windows.Forms.Timer(this.components);
this.smoothProgressBar1 = new SmoothProgressBar.UserControl1();
this.button1 = new System.Windows.Forms.Button();
this.smoothProgressBar2 = new SmoothProgressBar.UserControl1();
this.SuspendLayout();
//
// timer1
//
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
//
// smoothProgressBar1
//
this.smoothProgressBar1.Location = new System.Drawing.Point(40, 72);
this.smoothProgressBar1.Maximum = 100;
this.smoothProgressBar1.Minimum = 0;
this.smoothProgressBar1.Name = "smoothProgressBar1";
this.smoothProgressBar1.ProgressBarColor = System.Drawing.Color.Blue;
this.smoothProgressBar1.Size = new System.Drawing.Size(368, 24);
this.smoothProgressBar1.TabIndex = 0;
this.smoothProgressBar1.Value = 0;
//
// button1
//
this.button1.Location = new System.Drawing.Point(144, 200);
this.button1.Name = "button1";
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// smoothProgressBar2
//
this.smoothProgressBar2.Location = new System.Drawing.Point(48, 136);
this.smoothProgressBar2.Maximum = 100;
this.smoothProgressBar2.Minimum = 0;
this.smoothProgressBar2.Name = "smoothProgressBar2";
this.smoothProgressBar2.ProgressBarColor = System.Drawing.Color.Blue;
this.smoothProgressBar2.Size = new System.Drawing.Size(368, 24);
this.smoothProgressBar2.TabIndex = 2;
this.smoothProgressBar2.Value = 0;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(496, 301);
this.Controls.Add(this.smoothProgressBar2);
this.Controls.Add(this.button1);
this.Controls.Add(this.smoothProgressBar1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void timer1_Tick(object sender, System.EventArgs e)
{
if (this.smoothProgressBar1.Value > 0)
{
this.smoothProgressBar1.Value--;
this.smoothProgressBar2.Value++;
}
else
{
this.timer1.Enabled = false;
}
}

private void button1_Click(object sender, System.EventArgs e)
{
this.smoothProgressBar1.Value = 100;
this.smoothProgressBar2.Value = 0;

this.timer1.Interval = 1;
this.timer1.Enabled = true;

}

private void Form1_Load(object sender, System.EventArgs e)
{

}
}
}

[zdq801104]

引用DLL的问题就不用说了吧，把代码复制过去就可以用了

[tujiaping]

在ui线程里更新进度条应该就可以了

[julong88]

refresh()

[superfishmanweb]

zdq801104兄，我的那个进度条不时以各用于load的进度条，只使一格连接访问数据库的一种等待进度条，所以你说的那个似乎不怎么适合我，我要解决的问题是为什么我已经在弹出框中使用了Invalidate(); 但还是变成空白一片的问题。

[superfishmanweb]

julong88同志十分正确！