今天写了一个可以显示进度条的ListView控件,代码如下: /// <summary> /// ListViewEx 的摘要说明。 /// </summary> public class ListViewEx : System.Windows.Forms.ListView {  /// <summary>   /// 必需的设计器变量。  /// </summary>  private System.ComponentModel.Container components = null;   private String mProgressColumnText = String.Empty;  /// <summary>  /// 需要设置为进度条的列标头文字,根据这些文字判断所在列是否为进度条显示列  /// </summary>  private String ProgressColumnText  {   get   {    return mProgressColumnText;   }   set   {    mProgressColumnText = value;   }  }  private Color mProgressColor = Color.Red;  public Color ProgressColor  {   get   {    return this.mProgressColor;   }   set   {    this.mProgressColor = value;   }  }  private Color mProgressTextColor = Color.Black;  public Color ProgressTextColor  {   get   {    return mProgressTextColor;   }   set   {    mProgressTextColor = value;   }  }  public ListViewEx()  {   SetStyle(    ControlStyles.AllPaintingInWmPaint |    ControlStyles.DoubleBuffer |    ControlStyles.UserPaint |    ControlStyles.ResizeRedraw,    true);   InitializeComponent();    // TODO: 在 InitializeComponent 调用后添加任何初始化   }   public int ProgressColumIndex  {   set   {    progressIndex = value;   }   get   {    return progressIndex;   }  }  int progressIndex = -1;  /// <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 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()  {   //    // ListViewEx   //    this.Name = "ListViewEx";   this.Size = new System.Drawing.Size(544, 392);   this.Click += new System.EventHandler(this.ListViewEx_Click);   this.Paint += new System.Windows.Forms.PaintEventHandler(this.ListViewEx_Paint);   }  #endregion    const string numberstring = "0123456789.";  private bool CheckIsFloat(String s)  {   foreach(char c in s)   {    if(numberstring.IndexOf(c) > -1)    {     continue;    }    else     return false;   }   return true;  }  private void ListViewEx_Paint(object sender, System.Windows.Forms.PaintEventArgs e)  {   e.Graphics.Clear(this.BackColor);//清除显示类容   if(progressIndex == -1)//检索被设置为进度条的列   {    for(int i=0;i<this.Columns.Count;i++)    {     if(this.Columns[i].Text == mProgressColumnText)     {      progressIndex = i;break;     }    }   }     for(int i=0;i<this.Items.Count;i++)//依次绘制每一行   {    Rectangle rect = this.GetItemRect(i);//获取当前要绘制行的Rect    if(rect.Top < 0 || rect.Top >= this.ClientRectangle.Height)     continue; //不在显示范围内,跳过        if(rect != Rectangle.Empty)    {     int totalwidth = 0; //列宽记数,实际上就是当前要绘制列的X坐标     for(int j=0;j<this.Columns.Count;j++)     {      int currwidth = this.Columns[j].Width;//获取当前列宽度      Rectangle tmpRect = new Rectangle(totalwidth,rect.Top,currwidth,rect.Height);//生成当前subitem的外接矩形      if(j!= progressIndex)      { //非进度条列       DrawString(tmpRect,this.Items[i].SubItems[j].Text,this.Columns[j].TextAlign,e.Graphics,        this.Items[i].Selected);      }      else      { //进度条列       if(CheckIsFloat(this.Items[i].SubItems[j].Text))//判断当前subitem文本是否可以转为浮点数       {        float tmpf = float.Parse(this.Items[i].SubItems[j].Text);        if(tmpf >= 1.0f)        {         tmpf = tmpf / 100.0f;        }        DrawProgress(tmpRect,tmpf,e.Graphics,         this.Items[i].Selected);       }      }       totalwidth += this.Columns[j].Width;            }          }       }     } //绘制非进度条列的subitem  private void DrawString(Rectangle rect,String s,HorizontalAlignment aglin,Graphics g,bool isSelect)  {   StringFormat sf = new StringFormat();   switch(aglin)   {    case HorizontalAlignment.Center:     sf.Alignment = StringAlignment.Center;     break;    case HorizontalAlignment.Left:     sf.Alignment = StringAlignment.Near;     break;    case HorizontalAlignment.Right:     sf.Alignment = StringAlignment.Far;     break;   }   sf.LineAlignment = StringAlignment.Center;   sf.Trimming = StringTrimming.EllipsisCharacter;   if(!isSelect)    g.DrawString(s,this.Font,Brushes.Black,rect, sf);   else   {    g.FillRectangle(Brushes.RoyalBlue,rect);    g.DrawString(s,this.Font,Brushes.White,rect, sf);   }  } ///绘制进度条列的subitem  private void DrawProgress(Rectangle rect,float percent,Graphics g,bool isSelect)  {   if(rect.Height > 2 && rect.Width > 2)   {    if(rect.Top > 0 && rect.Top < this.Height &&      (rect.Left > this.Left && rect.Left < this.Width))    {     //绘制进度     int width = (int)(rect.Width * percent);     Rectangle newRect = new Rectangle(rect.Left + 1,rect.Top + 1,width - 2,rect.Height -2 );     using(Brush tmpb = new SolidBrush(this.mProgressColor))     {      g.FillRectangle(tmpb, newRect);     }     if(!isSelect)      g.DrawRectangle(Pens.Yellow,rect);     else     {      newRect = new Rectangle(rect.Left + 1,rect.Top + 1,rect.Width-2,rect.Height - 2);      g.DrawRectangle(Pens.RoyalBlue,newRect);     }     StringFormat sf = new StringFormat();     sf.Alignment = StringAlignment.Center;     sf.LineAlignment = StringAlignment.Center;     sf.Trimming = StringTrimming.EllipsisCharacter;     newRect = new Rectangle(rect.Left + 1,rect.Top + 1,rect.Width-2,rect.Height - 2);     using(Brush b = new SolidBrush(mProgressTextColor))     {      g.DrawString(percent.ToString("p1"),this.Font,b,newRect, sf);     }    }   }   else    return;  }   private void ListViewEx_Click(object sender, System.EventArgs e)  {   this.Invalidate();  } }

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