用button控制label的visible屬性

Question

我先定義了Label1的Visible 為false在下面的事件中,沒有效果，但如果不要UploadFile();這一句（我自定義的一個函數）就可以了，請問這個問題如何解決？？    protected void Button1_Click(object sender, EventArgs e)
    {
        this.Label1.Visible = true;      
        UploadFile();
    }

Answer 1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            this.label1.Visible = true;
        }
    }
}

Answer 2

在这边是可以的 开始还以为是没有刷新所致 faint

Answer 3

    protected void Button1_Click(object sender, EventArgs e) 
    { 
        this.Label1.Visible = true;      
        UploadFile(); 
    }
你改成
    protected void Button1_Click(object sender, EventArgs e) 
    { 
                UploadFile(); 
             this.Label1.Visible = true;          }试试

Answer 4

你自己写的uploadfile()的代码给出

Answer 5

UploadFile(); 
的代码不会有问题吧？

Answer 6

你在 UploadFile(); 是否执行了 this.Label1.Visible = false;    ?

Answer 7

沒有执行this.Label1.Visible = false

Answer 8

 
            UploadFile(); 
            this.Label1.Visible = true;    
            Label1.Invalidate();
試試。

Answer 9

web下沒有Label1.Invalidate();吧？？

Answer 10

在UploadFile(); 里面可能有this.Label1.Visible的操作！！  

Answer 11

我对UploadFile()里面的内容很感兴趣

Answer 12

下面是UploadFile()，沒有把属性改成false 
public void UploadFile() 
    { 
      if (FileUpload1.PostedFile != null) 
        { 
            string name = FileUpload1.FileName; 
            string dtstr = DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString();// +DateTime.Now.Minute.ToString(); 
            FileUpload1.PostedFile.SaveAs(Server.MapPath("Email") + "\\" + dtstr + name);                      ReadFile(Server.MapPath("Email") + "\\" + dtstr + name); 
        } 
    }

Answer 13

接上面 
private void ReadFile(string path) 
    { 
        if (con.ConnectionString == "") { con.ConnectionString = dtconn.getconn(); } 
        if (con.State.ToString() == "Closed") { con.Open(); }         if (System.IO.File.Exists(path)) 
        { 
            StreamReader reader = new StreamReader(path, System.Text.Encoding.GetEncoding("GB2312"));                        
            string oneline; 
    
            trans = con.BeginTransaction(); 
            try 
            {            
                while ((oneline = reader.ReadLine()) != null) 
                {                
                    oneline = oneline.Trim(); 
                    if (oneline != "") 
                    { 
                        string[] ss = oneline.Split(" ".ToCharArray()); 
                        string Smonth = "", Sday = "", Stime = "", Ssystem = "";//保存時間                         if (!(ss[0].ToString().Length == 0)) 
                        { 
                            Smonth = ss[0].ToString(); 
                            Sday = ss[1].ToString(); 
                            Stime = ss[2].ToString(); 
                            Ssystem = ss[3].ToString();                             StringBuilder sb = new StringBuilder(); 
                            sb.Append("insert into logdetails values("); 
                            int i; 
                            sb.Append("'" + Smonth + "'" + ","); 
                            sb.Append("'" + Sday + "'" + ","); 
                            sb.Append("'" + Stime + "'" + ","); 
                            sb.Append("'" + Ssystem + "'" + ",");                             sb.Append("'"); 
                            for (i = 4; i < ss.Length; i++) 
                            { 
                                if (ss[i].Contains("'")) 
                                { 
                                    string[] child = ss[i].ToString().Split("'".ToCharArray()); 
                                    if (!(child[0].ToString().Length == 0)) 
                                    { 
                                        for (int k = 0; k < child.Length; k++) 
                                        {                                        
                                            sb.Append(child[k] + "''"); 
                                        } 
                                        sb.Remove(sb.ToString().LastIndexOf("''"), 2); 
                                        sb.Append(" "); 
                                    } 
                                } 
                                else 
                                { 
                                    sb.Append(ss[i] + " "); 
                                }                        
                            } 
                            sb.Append("'"); 
                            sb.Append(")"); 
                            sqlexecute(sb.ToString()); 
                        } 
                    }                 } 
                reader.Close();            
                Response.Write(" <script language='javascript'>alert('导入数据完成!');history.go(-1); </script>");              
            } 
            catch (Exception ex) 
            { 
                trans.Rollback(); 
                Response.Write(" <script language='javascript'>alert('出现错误，事务已经回滚！');history.go(-1); </script>");                    
            } 
            finally 
            { 
                trans.Commit(); 
                con.Close(); 
            } 
        } 
        else 
        { 
            Response.Write(" <script language='javascript'>alert('指定的文件不存在!');history.go(-1); </script>"); 
            Response.End(); 
        } 
    }

Answer 14

会不会是ReadFile(string path) 中的数据库连接没有正常关闭?

Answer 15

先打断点，看看label1.visable=true有没有被执行
再看看生成的页面有没有label1

Answer 16

你在上传文件的时候 服务器并没有完你的请求···
等你传输完毕后 服务器才把VISABLE值为false
页面刷新，按钮才消失
你可以用JS把按钮阴了····在前台按钮添加 OnClick='document.all.buttonName.style.display="none";'就行了

Answer 17

看意思应该是显示上载文件信息用的，其实不用设置visable，只要把TEXT=“”就不会看到该控件，而当TEXT有字符时才看到该控件显示字符，而不用隐藏控件本身。