Question

我有一个页面，用于为管理员添加房间，管理员将选择他想要添加的房间数，然后继续命名房间ID，问题是我的按钮在给定的数量后不会禁用。如果管理员要添加5个房间，则只能单击按钮5次以添加房间，然后在单击按钮5次后应禁用。这是我的示例代码。

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

你应该使用session，因为在asp.net中，public var将返回每个请求的初始值

  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;
    }

根据用户输入限制按钮单击

2 个答案: