C# Winform：如何限制用户进入 TabControl 中的特定 TabPage

Question

我正在创建一个示例库存窗口表单应用程序，如果数量字典为空，则不应允许用户进入销售选项卡。

我正在使用 Metro 设计和材质皮肤混合来设计我的应用程序我在下面发布了一个代码示例，该示例适用于简单的 Winform 控件，但不适用于 Metro 和 Material Design。

代码示例

//check if selected tab is sales tab 
if (tcmain.SelectedTab == tpSales)
{
  //check if our cart is empty or not 
  if (Globals.qty.Count == 0)
  {
     //show error msg
     var diaEmptCart = MessageBox.Show("There Are 0 Products in Cart", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
     //set selected tab as purchase 
     tcmain.SelectedTab = tpPurchase;
  }
  else
  {
     //or show the products available in cart for sales 
     //populate combo box with them 
     cmbPro.DataSource = new BindingSource(Globals.qty, null);
     //set key as display member 
     cmbPro.DisplayMember = "Key";
  }
}
//check if selectedd tab is tab purchase 
if (tcmain.SelectedTab == tpPurchase)
{
  if (Globals.qty.Count == 0)
  {
    //if yes, setting cart empty
    pbCart.Image = Image.FromFile(@"C:\Users\ThE PrOgRaMmEr\Documents\Visual Studio 2013\Projects\simpleInventory.cs.MUI\simpleInventory.cs\Resources\crt_empty.png");
  }
  else
  {
    //if not, setting cart full
    pbCart.Image = Image.FromFile(@"C:\Users\ThE PrOgRaMmEr\Documents\Visual Studio 2013\Projects\simpleInventory.cs.MUI\simpleInventory.cs\Resources\crt_full.png");
  }
}

Answer 1

您需要处理控件的选项卡选择事件。试试这个：

private void tcmain_Selecting(object sender, TabControlCancelEventArgs e)
{
      //Change whatever you want
      if (tcmain.TabPages[e.TabPageIndex] == tpSales && Globals.qty.Count == 0)
            e.Cancel = true;
}

但问题是您为什么还要显示标签。我建议不要创建不需要的选项卡。