C#（WinForm）常用小知識點

一）C#遍曆容器中的控制項
代碼1：
private List<Control> find(Control c, Type t)  //c 為容器控制項,  t 為所選類型
{
     List<Control> controls = new List<Control>();
     foreach (Control cc in c.Controls)
     {
          if (cc.GetType() == t)
              controls.Add(cc);
     }
     return controls;
}

代碼2：

public List<TextBox> getTextBoxList()
 {
            try
            {
                List<TextBox> lstText = new List<TextBox>();
                IEnumerator ier = this.panel1.Controls.GetEnumerator();
                while (ier.MoveNext())
                {
                    if (ier.Current is TextBox)
                    {
                        TextBox a = ier.Current as TextBox;
                        lstText.Add(a);
                    }
                }
                return lstText;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex.Message);
            }
            return null;
 }

二）c#中如何得到一個文本串的寬度（以像素px為單位）

 

.NET 的 System.Drawing 空間中，Graphics 對象提供了能達到此目的的方法：MeasureString()        public void PrintOutBox(string printStr,int printWidth,string printAlingment,System.Windows.Forms.PaintEventArgs g)
  {
            int x1 = CurrentX;
            int y1= CurrentY;
            int t_space=2;
            SizeF sf=g.MeasureString(printStr,printFont());// printFont()為傳回型別為Font的方法            Rectangle rec1 = new Rectangle(CurrentX, CurrentY, printWidth, (int)(sf.Height + t_space));
            g.DrawRectangle(Pens.Black,rec1);
            if (printAlingment == "r" | printAlingment == "R")
            {
                CurrentX = x1 + printWidth - (int)sf.Width;
                CurrentY = y1 +  (t_space / 2);
            }
            g.DrawString(printStr, printFont(), Brushes.Black, CurrentX, CurrentY);
  }