单击C＃清除私有空白 [英] Clear private void with click C#

问题描述

我的代码工作并创建自动按钮...



一切正常



我需要点击按钮上的清晰表格



一些帮助？



我尝试了什么：

 private void artikli_buttoni（）// pice 
 {
 
 SqlConnection con = new SqlConnection （数据源=。\\SQLEXPRESS;初始目录= bss;集成安全性=真）; 
 // SqlConnection con = new SqlConnection（cs）; 
 SqlCommand cmd = new SqlCommand（SELECT ime +' - '+ cijena_sa_porezom，data FROM roba_usluge where grupa_artikala ='Piće'，con）; 
 
 
 var da = new SqlDataAdapter（cmd）; 
 var ItemTable = new DataTable（）; 
 da.Fill（ItemTable）; 
 
 con.Open（）; 
 Int32 count = ItemTable.Rows.Count; 
 con.Close（）; 
 
 int top = 70; 
 int left = 10; 
 for（int i = 1; i< = count; i ++）
 
 {
 Button button = new Button（）; 
 button.Size = new Size（128,128）; 
 button.BackColor = Color.Transparent; 
 //butbut.FlatStyle = FlatStyle.Flat; 
 button.FlatAppearance.BorderSize = 0; 
 button.Font = new System.Drawing.Font（Trebuchet MS，10）; 
 button.TextAlign = ContentAlignment.TopCenter; 
 button.BackgroundImageLayout = ImageLayout.Zoom; 
 
 button.Left = left; 
 button.Top = top; 
 button.Text = ItemTable.Rows [i  -  1] [0] .ToString（）; 
 
 if（ItemTable.Rows [i  -  1] [1]！= null）
 {
 try 
 {
 byte [] _byte =（ byte []）ItemTable.Rows [i  -  1] [1]; 
 MemoryStream ms = new MemoryStream（_byte）; 
 button.BackgroundImage = System.Drawing.Image.FromStream（ms）; // bilo image 
} 
 catch {} 
} 
 
 
 button.Click + = new EventHandler（this.btn_Click）; 
 
 
 this.Controls.Add（button）; 
 if（i％5 == 0）
 {
 left = 10; 
 top + = button.Height + 2; 
} 
其他
 {
 left + = button.Width + 2; 
} 
 
 
 
} 
} 
 

解决方案

一个懒惰的（？）/实用解决方案将是在列表中注册动态创建的按钮。此列表稍后可用于删除它们。



由@ John-Simmons-outlaw-programmer提示约翰西蒙斯/非法程序员 - 专业档案 [ ^ ]：别忘了也为每个按钮解开事件处理程序



最后这个示意图伪代码可以帮助您实现您的请求



表格：

< pre lang =c＃>列表按钮dynBtnList = new ...;

AddBtn：

  所需的每个按钮：
 Button btn =  new 按钮... 
 btn.Click + = 此 .btn_Click; 
 dynBtnList.Add（btn）
  this  .Controls.Add（btn）; 

RemoveBtn：

  for  each（Button btn  in  dynBtnList;）
 {
 btn.Click- =  this  .btn_Click; 
 Controls.Remove（btn）; 
} 
 dynBtnList.Clear（）; 

My code work and create automatcly buttons...

Everything working fine

I need clear form on button click

some help?

What I have tried:

private void artikli_buttoni()  //pice
       {

           SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;Initial Catalog=bss;Integrated Security=True");
           //SqlConnection con = new SqlConnection(cs);
           SqlCommand cmd = new SqlCommand("SELECT ime+'-'+cijena_sa_porezom, data FROM roba_usluge where grupa_artikala='Piće'", con);


           var da = new SqlDataAdapter(cmd);
           var ItemTable = new DataTable();
           da.Fill(ItemTable);

           con.Open();
           Int32 count = ItemTable.Rows.Count;
           con.Close();

           int top = 70;
           int left = 10;
           for (int i = 1; i <= count; i++)

           {
               Button button = new Button();
               button.Size = new Size(128, 128);
               button.BackColor = Color.Transparent;
               //button.FlatStyle = FlatStyle.Flat;
               button.FlatAppearance.BorderSize = 0;
               button.Font = new System.Drawing.Font("Trebuchet MS", 10);
               button.TextAlign = ContentAlignment.TopCenter;
               button.BackgroundImageLayout = ImageLayout.Zoom;

               button.Left = left;
               button.Top = top;
               button.Text = ItemTable.Rows[i - 1][0].ToString();

               if (ItemTable.Rows[i - 1][1] != null)
               {
                   try
                   {
                       byte[] _byte = (byte[])ItemTable.Rows[i - 1][1];
                       MemoryStream ms = new MemoryStream(_byte);
                       button.BackgroundImage = System.Drawing.Image.FromStream(ms);//bilo image
                   }
                   catch { }
               }


               button.Click += new EventHandler(this.btn_Click);


               this.Controls.Add(button);
               if (i % 5 == 0)
               {
                   left = 10;
                   top += button.Height + 2;
               }
               else
               {
                   left += button.Width + 2;
               }



           }
       }

解决方案

A maybe lazy(?)/pragmatic solution will be to Register the dynamic created Buttons in a list. This list can later be used to remove them.

Hint by @John-Simmons-outlaw-programmer John Simmons / outlaw programmer - Professional Profile[^]: "Don't forget to also unhook your event handler for each button"

Finally this schematic pseudo code should help you to implement your request

Form:

List Button dynBtnList= new...;

AddBtn:

for each button needed:
Button btn= new Button...
btn.Click+= this.btn_Click;
dynBtnList.Add(btn)
this.Controls.Add(btn);

RemoveBtn:

for each(Button btn in dynBtnList;)
{
  btn.Click-= this.btn_Click;
  Controls.Remove(btn);
}
dynBtnList.Clear();

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