来个人吧 苦恼死我了

Question

 foreach (ListItem item in this.CheckBoxList1.Items)
            {
                if (item.Selected==true)
                {
                    if (item.Value==dj)
                    {
                         Response.Write("<script>alert('" + kc + "')</script>"); 
                    } 
                   
                }
              
            }只要我加了第2个if 就显示不出来  我这句话没问题吧 大哥们

Answer 1

 string dj;
            string kc;
            while (sdr.Read())
            {
                kc = sdr["课程号"].ToString();
                dj = sdr["等级"].ToString();
            }
            foreach (ListItem item in this.CheckBoxList1.Items)
            {
                if (item.Selected==true||item.Value==dj)
                {
                    
                         Response.Write("<script>alert('" + kc + "')</script>"); 
                 
                }
              
            }
看下

Answer 2

 foreach (ListItem item in this.CheckBoxList1.Items)
            {
                if (item.SelectedValue==dj)
                    {
                         Response.Write("<script>alert('" + kc + "')</script>"); 
                    
                   
                }
              
            }

Answer 3

if (item.Value.tostring()==dj)

Answer 4

item.Value==dj 这个条件没满足,你一个if时,因为是 或 的关系,当然会弹出alert,因为已经满足了item.Selected==true

Answer 5

if (this.CheckBoxList1.SelectedValue==dj)
  {
  Response.Write("<script>alert('" + kc + "')</script>");  
    
    
  }可以直接这么写

Answer 6

if (item.Selected==true && item.Value==dj)
   {
 Response.Write("<script>alert('" + kc + "')</script>");  
     }

Answer 7

 SqlCommand da_bm = new SqlCommand("SELECT 课程号,等级 FROM 等级成绩表 WHERE (会考证号 = '" + GridView1.SelectedRow.Cells[1].Text.ToString() + "') and 等级>=3 ", cnnDB);
            cnnDB.Open();
            SqlDataReader sdr = da_bm.ExecuteReader();
            string dj;
            string kc;
            while (sdr.Read())
            {
                kc = sdr["课程号"].ToString();
                dj = sdr["等级"].ToString();
            }
            foreach (ListItem item in this.CheckBoxList1.Items)
            {
                if (this.CheckBoxList1.SelectedValue == dj)
                {
                         Response.Write("<script>alert('" + kc + "已经通过考试，请不要连续报名！谢谢')</script>"); 
                }
              
            }
            cnnDB.Close();还是不行啊 大哥们

Answer 8

 if (this.CheckBoxList1.SelectedValue == dj)
中的dj的值是null，肯定出不来值了。你的先给dj变量赋值。

Answer 9

关键是我只要加第2个 IF 她就什么都不显示了
断点也进不去
不加第2个IF 一切正常

Answer 10

 SqlCommand da_bm = new SqlCommand("SELECT 课程号,等级 FROM 等级成绩表 WHERE (会考证号 = '" + GridView1.SelectedRow.Cells[1].Text.ToString() + "') and 等级>=3 ", cnnDB);
            cnnDB.Open();
            SqlDataReader sdr = da_bm.ExecuteReader();
            string dj;
            string kc;
            while (sdr.Read())
            {
                kc = sdr["课程号"].ToString();
                dj = sdr["等级"].ToString();
            }
            foreach (ListItem item in this.CheckBoxList1.Items)
            {
                if (item.Selected==true)
                {
                    if (item.Value==dj)
                    {
                         Response.Write("<script>alert('" + kc + "')</script>"); 
                    } 
                   
                }
              
            }
          
           
            cnnDB.Close();
事件里的代码  帮忙看下

Answer 11

 foreach (ListItem item in this.CheckBoxList1.Items)
  {
Response.Write(dj）； //添加一个测试语句，看看dj的值是什么？  if (this.CheckBoxList1.SelectedValue == dj)
  {
  Response.Write("<script>alert('" + kc + "已经通过考试，请不要连续报名！谢谢')</script>");  
  }

Answer 12

- -
foreach
只要加 Response.Write(dj）；
就什么都不显示了
难道是我的变量问题？

Answer 13

string dj＝null;
 string kc＝null;
定义时你先赋值，估计就可以实现了

Answer 14

  SqlCommand da_bm = new SqlCommand("SELECT 课程号,等级 FROM 等级成绩表 WHERE (会考证号 = '" + GridView1.SelectedRow.Cells[1].Text.ToString() + "') and 等级>=3 ", cnnDB);
            cnnDB.Open();
            SqlDataReader sdr = da_bm.ExecuteReader();
            string dj;
            string kc;
            while (sdr.Read())
            {
                kc = sdr["课程号"].ToString();
                dj = sdr["等级"].ToString();
            }
            foreach (ListItem item in this.CheckBoxList1.Items)
            {
               
                if (item.Selected==true)
                {
                    
                }
              
            }
          
           
            cnnDB.Close();我这样写 一点问题没有  下来  加个IF也错  加啥都错  无奈了

Answer 15

dj 肯定是null 或者其他什么值，去数据库执行下这个sql 看看dj值是什么。

Answer 16

SqlCommand da_bm = new SqlCommand("SELECT 课程号,等级 FROM 等级成绩表 WHERE (会考证号 = '" + GridView1.SelectedRow.Cells[1].Text.ToString() + "') and 等级>=3 ", cnnDB);
            cnnDB.Open();
            SqlDataReader sdr = da_bm.ExecuteReader();
            string dj;
            string kc;
            while (sdr.Read())
            {
                kc = sdr["课程号"].ToString();
                dj = sdr["等级"].ToString();
            }  
                  IF(this.CheckBoxList1.SelectedValue==DJ)          
                    {
                         Response.Write("<script>alert('" + kc + "')</script>"); 
                    }                   
             
          
           
            cnnDB.Close();

Answer 17

你先给dj初始化个值。
string dj＝null;
 string kc＝null;

Answer 18

SqlCommand da_bm = new SqlCommand("SELECT 课程号,等级 FROM 等级成绩表 WHERE (会考证号 = '" + GridView1.SelectedRow.Cells[1].Text.ToString() + "') and 等级>=3 ", cnnDB);
            cnnDB.Open();
            SqlDataReader sdr = da_bm.ExecuteReader();
            string dj;
            string kc;
            while (sdr.Read())
            {
                kc = sdr["课程号"].ToString();
                dj = sdr["等级"].ToString();
            }  
                  IF(this.CheckBoxList1.SelectedValue==DJ)          
                    {
                         Response.Write("<script>alert('" + kc + "')</script>"); 
                    }                  
             
          
           
            cnnDB.Close();

Answer 19

SqlCommand da_bm = new SqlCommand("SELECT 课程号,等级 FROM 等级成绩表 WHERE (会考证号 = '" + GridView1.SelectedRow.Cells[1].Text.ToString() + "') and 等级>=3 ", cnnDB);
            cnnDB.Open();
            SqlDataReader sdr = da_bm.ExecuteReader();
            string dj;
            string kc;
            while (sdr.Read())
            {
                kc = sdr["课程号"].ToString();
                dj = sdr["等级"].ToString();
            }
            foreach (ListItem item in this.CheckBoxList1.Items)
            {
               
                if (item.Value == dj)
                {
                   Response.Write("<script>alert('" + kc + "')</script>");   
                }
              
            }
          
           
            cnnDB.Close();

Answer 20

不好意思，看错你的意思了．比较应该没错的．this.CheckBoxList1.Items　 的 ListItem 的text,Value  你是如何赋值的？

Answer 21

foreach (ListItem item in this.CheckBoxList1.Items)
            {
                if (item.Selected==true && item.valeue ==dj)
                {
                                            Response.Write("<script>alert('" + kc + "')</script>"); 
                    
                   
                }
              
            }

Answer 22

item.Selected.Value 是object，dj是个string 肯定不等啦，

Answer 23

checkbox 的 item？ 模糊记忆item.value 只是 1,0,2 此类的东西 仅供参考