根據用戶輸入限制按鈕的點擊次數

Question

我有一個頁面，其中用於添加管理員房間，管理員將選擇他要添加的房間數量，然后繼續命名房間ID，問題是給定數量的按鈕后我的按鈕將無法禁用。 如果管理員要添加5個房間，則只能單擊5次該按鈕以添加房間，然后單擊5次后應禁用該按鈕。 這是我的示例代碼。

int count = 0; // <-- Global Variable

protected void addBtn_Click(object sender, EventArgs e)
    {
        int qty = Convert.ToInt32(qtyDDL.SelectedValue);  // <--number of rooms admin wants to add
        count++;   
        roomtypeDDL.Enabled = false;
        qtyDDL.Enabled = false;
        if(count < qty)
        {
            string roomid = roomidBox.Text;
            string rtype = roomtypeDDL.SelectedItem.ToString();
        }

        else
        {
            roomidBox.Enabled = false;
            roomtypeDDL.Enabled = true;
            addBtn.Enabled = false;
            addBtn.BackColor = System.Drawing.ColorTranslator.FromHtml("#2C2A2A");
        }
    }

Answer 1

您應該使用會話，因為在asp.net中，每個請求的公共變量都將返回初始值

  protected void addBtn_Click(object sender, EventArgs e)
    {
        if (Session["Count"]==null)
        {
            Session["Count"] = 0;
        }
        count = int.Parse(Session["Count"]);
        int qty = Convert.ToInt32(qtyDDL.SelectedValue);  // <--number of rooms admin wants to add
        count++;
        roomtypeDDL.Enabled = false;
        qtyDDL.Enabled = false;
        if (count < qty)
        {
            string roomid = roomidBox.Text;
            string rtype = roomtypeDDL.SelectedItem.ToString();
        }

        else
        {
            roomidBox.Enabled = false;
            roomtypeDDL.Enabled = true;
            addBtn.Enabled = false;
            addBtn.BackColor = System.Drawing.ColorTranslator.FromHtml("#2C2A2A");
        }
        Session["Count"] = count;
    }

Answer 2

protected void qtyDDL_SelectedIndexChanged(object sender, EventArgs e)
    {
        try
        {
            if (qtyDDL.SelectedIndex == 0)
            {
                //My Code
            }
            else
            {
                Session["Count"] = 0; // <-- sets count to 0 every click on quantity
            }
        }
        catch(Exception ex)
        {
            Label1.Text = ex.Message;
        }

    }

 protected void addBtn_Click(object sender, EventArgs e)
    {
        count = Convert.ToInt32(Session["Count"]); // <-- set variable 
        roomtypeDDL.Enabled = false;
        qtyDDL.Enabled = false;
        string rtype, roomid;

        if(count < Convert.ToInt32(Session["qty"]))
        {
            string roomid = roomidBox.Text;
            string rtype = roomtypeDDL.SelectedItem.ToString();
        }

        count++;

        if (count == Convert.ToInt32(Session["qty"])) // <--Disable Add Button
        {
            roomidBox.Enabled = false;
            roomtypeDDL.Enabled = true;
            roomtypeDDL.SelectedIndex = 0;
            qtyDDL.SelectedIndex = 0;
            addBtn.Enabled = false;
            addBtn.BackColor = System.Drawing.ColorTranslator.FromHtml("#2C2A2A");
        }
        Session["Count"] = count;
    }