提前处理验证Windows窗体上控件的事件 [英] Advance handling for validating event for controls on windows form

问题描述

我正在设计一个数据输入表格。

用户界面包括：

1.用户名的文本框

2. textbox for用户代码

3. listview显示现有用户的名单

4.添加新用户的按钮



现在，处理2个文本框的验证事件，我写了这段代码：

I am designing a data entry form.
The UI consists of:
1. textbox for user name
2. textbox for user code
3. listview showing a list of names of existing users
4. button to add new user

Now, handling validating event for the 2 textboxes, I have written this code:

void tb_Name_Validating(object sender, CancelEventArgs e)
{
  try
  {
    if(tb_Name.TextLength == 0)
      {
        tb_Code.Enabled = false;
        tb_Name.ForeColor = Color.White;
        tb_Name.BackColor = Color.PaleVioletRed;
        tb_Name.Focus();
      }
  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.ToString());
  }
}

我不允许用户移动到下一个控件，除非用户提供了一个值用户名。



现在，当输入焦点仍在tb_Name并且用户点击listview控件中的项目时出现问题。

一旦用户单击listview项，就会触发验证文本框tb_Name的事件。并且焦点再次保留在文本框本身上并出现错误（更改背景色）。



我想绕过验证事件。但是，我不知道如何告诉c＃用户已经移动到tb_Code以外的某些控件。验证事件必须在用户尝试移动以控制tb_Code时发生。



任何帮助都将受到高度赞赏。

谢谢！< br $> b $ b

我尝试了什么：



我试过按顺序Enter，Leave，GotFocus，LostFocus，验证和验证的事件。

此外，我尝试了许多替代方案，但没有一个完美无缺。

I am not allowing user to move to next control unless user has provided a value for the user name.

Now, problem comes when the input focus is still at tb_Name and user clicks on an item in the listview control.
As soon as user clicks on the listview item, validating event for the textbox tb_Name is fired. And the focus is again remained on the textbox itself with an error (changing backcolor).

I want to bypass validating event. But, I dont know how to tell c# that user has moved to some control other than tb_Code. The validating event must occured only when user tries to move to control tb_Code.

Any help will be highly appreciated.
Thank you!

What I have tried:

I tried going through the order of events for Enter,Leave, GotFocus, LostFocus, validating and validated.
Also, I tried many alternatives but none worked perfectly.

推荐答案

如果只想在用户输入tb_Code时进行验证，请使用tb_Code.Enter事件，并在那里移动验证码。

If you want to validate only when the user enters tb_Code, then use the tb_Code.Enter event, and move the validation code there.

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