愚蠢的问题:IF声明 [英] Silly question: IF statement

问题描述

大家好，我确实有一个愚蠢的问题，或一个我无法解决的问题(我真的不知道为什么，这实际上是基础知识).
因此，我有两个文本框.在每个文本框的侧面/末端都有一个设置为Visible:false的标签.
当在文本框中输入错误时，必须显示此标签.

还有一个简单的查询，我可以从中获取值以在文本框中进行比较.
像这样:

Hi guys, I really have a silly question, or problem- which I really can`t solve (I really don`t know why, it`s actually basics).
So, I have two textboxes. On the side/end of each textbox there is a label which is set Visible:false.
This label has to be shown when the false input is in the textbox.

There is also one simple query from which I take values to compare in textboxes.
So it go like this:

if(txt_name!=query.Name) && (txt_lastname!=query.LastName)
{
lbl_nameError.Visible=true;
lbl_lastNameError.Visible=true;
}

如果两个值都是正确的/不正确的，那么它就完美地工作了.
一件事正确而另一件事不正确时，我会遇到问题.
你能帮我吗?
我已经尝试过了，但是标签混乱(如果值正确，标签仍然存在.)

It works just perfect, if both of values are correct /incorrect.
I have a problem when one thing is correct and the other incorrect.
Can you please help me?
I`ve tried like this, but there is a mess up with labels (if the value is correct, the label is still there..)

if(queryUsers!=null)
{
if(txt_name!=query.Name) && (txt_lastname!=query.LastName) //if both of the values are incorrect, make both of labels visible
{
lbl_nameError.Visible=true;
lbl_lastNameError.Visible=false;
}
if(txt_name!=query.Name) //if only name is incorrect, make only name label visible and lastname not visible
{
lbl_nameError.Visible=true;
lbl_lastNameError.Visible=true;
}
if(txt_lastname!=query.LastName) //if only lastname is incorrect, make only lastname label visible and name not visible
{
lbl_lastNameError.Visible=true;
lbl_nameError.Visible=false;
}
}

我想念的是什么?

What am I missing?

推荐答案

在这里您甚至不需要if:

You don''t even need an if here:

lbl_nameError.Visible = txt_name != query.Name;
lbl_lastNameError.Visible = txt_lastname != query.LastName;

但是，如果要使用if:

But if you want to use an if:

if (txt_name!=query.Name)
{
    lbl_nameError.Visible = true;
}
else
{
    lbl_nameError.Visible = false;
}

if (txt_lastname != query.LastName)
{
    lbl_lastNameError.Visible = true;
}
else
{
    lbl_lastNameError.Visible = false;
}

似乎您应该使用else if.如果->不是如果.

您将在以后的if语句中覆盖所有逻辑.

Seems like you should be using else if. Not if -> if.

You will override any logic in later if statements.

if(txt_name!=query.Name) && (txt_lastname!=query.LastName) //if both of the values are incorrect, make both of labels visible
{
   lbl_nameError.Visible=true;
   lbl_lastNameError.Visible=false;
}
else if(txt_name!=query.Name) //if only name is incorrect, make only name label visible and lastname not visible
{
   lbl_nameError.Visible=true;
   lbl_lastNameError.Visible=true;
}
else if(txt_lastname!=query.LastName) //if only lastname is incorrect, make only lastname label visible and name not visible
{
   lbl_lastNameError.Visible=true;
   lbl_nameError.Visible=false;
}

正如评论中指出的那样，与您的评论相比，您的逻辑也是错误的.我既未纠正该错误，也未尝试确切了解您想要的逻辑(您应更正错误，以便我们更容易理解).我认为您的案例作为else if而不是连续的if更为有意义，这可能会导致您的问题(例如，第二个if消除了第一个的设置)

As was pointed out in the comment your logic is also wrong compared to your comments. I did not correct that nor try to understand exactly the logic you are wanting (you should correct the error so it is easier for us to understand). I am thinking your case makes more sense as an else if versus continual if, which could be causing your problems (e.g. the second if eliminates the settings of the first)

你好，

试试这个:

Hello,

Try this:

if(queryUsers!=null)
{
    lbl_nameError.Visible = txt_name!=query.Name;
       if(!lbl_nameError.Visible)
          lbl_lastNameError.Visible = txt_lastname!=query.LastName;
}

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