显示在运行时

Question

随机图像我想显示随机图像

继承人我的代码

private void Page_Load(object sender, EventArgs e) 
{ 
    int num1=0; 
    Random randNum = new Random(); 
    num1 = randNum.Next(0, 9); 
    Image1.ImageUrl = DisplayNumber(num1); 
    Image1.Visible=true; 
} 

protected string DisplayNumber(int i) 
{ 
     string imagepath=""; 
     switch (i) 
     { 
      case 0: 
       imagepath = "~/fordoctor/doctor_login/images/0.GIF"; 
       break; 

      case 1: 
       imagepath = "~/fordoctor/doctor_login/images/1.GIF"; 
       break; 

      case 2: 
       imagepath = "~/fordoctor/doctor_login/images/2.GIF"; 
       break; 

      case 3: 
       imagepath = "~/fordoctor/doctor_login/images/3.GIF"; 
       break; 

      case 4: 
       imagepath = "~/fordoctor/doctor_login/images/4.GIF"; 
       break; 

      case 5: 
       imagepath = "~/fordoctor/doctor_login/images/5.GIF"; 
       break; 

      case 6: 
       imagepath = "~/fordoctor/doctor_login/images/6.GIF"; 
       break; 

      case 7: 
       imagepath = "~/fordoctor/doctor_login/images/7.GIF"; 
       break; 

      case 8: 
       imagepath = "~/fordoctor/doctor_login/images/8.GIF"; 
       break; 

      case 9: 
       imagepath = "~/fordoctor/doctor_login/images/9.GIF"; 
       break; 
     } 
     Session["num1"] = imagepath; 
     return imagepath; 

    } 

，但它不显示任何 我甚至已经检查使用的Response.Write（会话[“NUM1”图像]的ToString（））; 和图像显示在下一页

Answer 1

我建议让您的代码与此类似：

private void Page_Load(object sender, EventArgs e) { 
    string imgUrl = GetRandomImageUrl(); 
    Session["num1"] = imgUrl; 
    Image1.ImageUrl = imgUrl; 
    Image1.Visible = true; 
} 

protected string GetRandomImageUrl() { 
    Random r = new Random(); 
    return String.Format("~/fordoctor/doctor_login/images/{0}.gif", r.Next(0, 9)); 
} 

Answer 2

检查您的GIF的情况下，应该是小写（通常）。