(1) int i=12345; this.textBox1.Text=i.ToString(); //結果 12345(this指當前對象,或叫當前類的實例) this.textBox2.Text=i.ToString("d8"); //結果 00012345 (2) int i=123; double j=123.45; string s1=string.Format("the value is {0,7:d}",i); string s2=string.Format("the value is {0,7:f3}",j); this.textBox1.Text=s1 ; //結果 the value is 123 this.textBox2.Text=s2; //結果 the value is 123.450 (3)double i=12345.6789; this.textBox1.Text=i.ToString("f2"); //結果 12345.68 this.textBox2.Text=i.ToString("f6"); //結果 12345.678900 (4)double i=12345.6789; this.textBox1.Text=i.ToString("n"); //結果 12,345.68 this.textBox2.Text=i.ToString(“n4”); //結果 12,345.6789 (5)double i=0.126; string s=string.Format("the value is {0:p}",i); this.textBox1.Text=i.ToString("p"); //結果 12.6% this.textBox2.Text=s; //結果 the value is 12.6% (6) DateTime dt =new DateTime(2003,5,25); this.textBox1.Text=dt.ToString("yy.M.d"); //結果 03.5.25 this.textBox2.Text=dt.ToString(“yyyy年M月”); //結果 2003年5月 Convert.ToDateTime("2005/12/22 22:22:22").ToString("yyyy/MM/dd HH:mm:ss") "2005/12/22 22:22:22" (7) int i=123; double j=123.45; string s=string.Format("i:{0,-7},j:{1,7}",i,j); //-7表示左對齊,占7位 this.textBox1.Text=s ; //結果i:123 ,j: 123.45