C# 按钮启用属性无法正常工作
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Buttons Enabled Property not Working Properly
提问by sheetal
I am creating an Windows Application. I have two buttons. I have written the following code snippet.
我正在创建一个 Windows 应用程序。我有两个按钮。我编写了以下代码片段。
frmRb obj = new frmrb();
private void btnPd_Click(object sender, EventArgs e)
{
btnCancel.Enabled = true;
obj.btnRtn.Enabled = true;
}
private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
obj.BringToFront();
obj.Focus();
}
The above coding does not generate any error.
上面的编码不会产生任何错误。
All the statements are working properly but the following statement is not working properly:
所有语句都正常工作，但以下语句无法正常工作：
obj.btnRtn.Enabled = true;
obj.btnRtn.Enabled = true;
is not executed.
不被执行。
The frmrb forms is bring to front and it is focussed but btnRtn is not Enabled that is the statement obj.btnRtn.Enabled = true; is not working.
frmrb 形式被带到前面并且它是集中的，但是 btnRtn 不是 Enabled，即语句 obj.btnRtn.Enabled = true; 不管用。
By default I have set the property of btnRtn Enabled to false. And Please note the Modifier property of btnRtn button is set to PUBLIC.
默认情况下，我已将 btnRtn Enabled 的属性设置为 false。并且请注意 btnRtn 按钮的 Modifier 属性设置为 PUBLIC。
Now how should I change the coding so that I can get this statement executed.
现在我应该如何更改编码以便我可以执行此语句。
obj.btnRtn.Enabled = true;
obj.btnRtn.Enabled = true;
Can anybody help me out?
有人可以帮我吗？
Thanks in Advance!!
提前致谢！！
回答by Jon Skeet
I strongly suspect that eitherthe click handler isn't being called oryou're not looking at the form you think you are.
我强烈怀疑，要么点击处理程序没有被调用或者你不看着你以为你是形式。
Where are you setting up the click handler for btnPd_Click? Check that's still wired up correctly.
你在哪里设置 btnPd_Click 的点击处理程序？检查是否仍然正确接线。
Then put a breakpoint on the first line of the handler and run it in the debugger - if you don't hit the breakpoint when you click the button, that's the problem.
然后在处理程序的第一行放置一个断点并在调试器中运行它 - 如果单击按钮时没有命中断点，那就是问题所在。
EDIT: Okay, next steps:
编辑：好的，接下来的步骤：
- Check that you're looking at the right button. Change its text as well as enabling it.
- Check that its container is enabled, as suggested by phoenix. Not just its direct parent, but all the way up.
- Check what else your UI thread is doing afterwards - are you blocking it for some reason? Does the rest of the UI work at that point?
- 检查您是否正在查看正确的按钮。更改其文本并启用它。
- 按照 phoenix 的建议，检查其容器是否已启用。不仅是它的直接父级，而且一直向上。
- 检查您的 UI 线程之后还在做什么 - 您是否出于某种原因阻止了它？其余的 UI 在那一点上工作吗？
回答by Larry Watanabe
I've been using VB rather than C#, but the languages are very similiar. in VB, you have to add "handles SomeButton.Click" to make it handle the Click events.
我一直在使用 VB 而不是 C#，但是语言非常相似。在 VB 中，您必须添加“handles SomeButton.Click”以使其处理 Click 事件。
According to google, the equivalent in C# is to go into the Designer.cs file, find where the controls are, and manually change the click event hookup to point to your new event handler.
根据 google 的说法，C# 中的等效项是进入 Designer.cs 文件，找到控件所在的位置，然后手动更改单击事件连接以指向新的事件处理程序。
As mentioned by the previous poster, use a breakpoint (F9) and the debugger to see if that method is ever called when you execute the event. If it is not called, then the problem is probably not with the enabled property, but the wiring of the method so that it is invoked when the event occurs.
如上一个海报所述，使用断点 (F9) 和调试器查看在执行事件时是否调用过该方法。如果它没有被调用，那么问题可能不在于 enabled 属性，而是方法的连接，以便在事件发生时调用它。
Here's a reference:
这是一个参考：
回答by rahul
Is the button placed inside a panel or any container. If yes then please check the enabled status of the containeralso.
按钮是否放置在面板或任何容器内。如果是，请同时检查容器的启用状态。
回答by Varun Mahajan
Just a hunch. May be the 'Locked' property of button is 'true'
只是一种预感。可能是按钮的“锁定”属性为“真”
回答by Varun Mahajan
You not mention that where you obj(which is the instance of frmRb) show. because it is very important point. from your coding it seem that frmRb is already visible. so u never called the
你没有提到你obj（这是 frmRb 的实例）显示的地方。因为这是非常重要的一点。从您的编码看来， frmRb 已经可见。所以你从来没有打电话给
obj.Show() ;
instead you call the
相反，你打电话给
obj.BringToFront();
so the problem is that you never show the frmRb object. which is you create u in 1st line. each time u write the line
所以问题是你从不显示 frmRb 对象。这是你在第一行创建你。每次你写这行
frmRb obj = new frmrb();
new instance of frmrb is created. So u must again show it, with the line obj.Show() ; Now u rewrite ur code as ::
frmrb 的新实例被创建。所以你必须再次显示它，用 obj.Show() 行；现在你将你的代码重写为 ::
frmRb obj = new frmrb();
private void btnPd_Click(object sender, EventArgs e)
{
btnCancel.Enabled = true;
obj.btnRtn.Enabled = true;
}
private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
obj.Show();
obj.BringToFront();
obj.Focus();
}
I hope it is helpful for u and solve ur problem.
我希望它对你有帮助并解决你的问题。
回答by Beth
I would try just switching the sequence of statements to: private void btnPd_Click(object sender, EventArgs e) { obj.btnRtn.Enabled = true; btnCancel.Enabled = true; }
我会尝试将语句序列切换为： private void btnPd_Click(object sender, EventArgs e) { obj.btnRtn.Enabled = true; btnCancel.Enabled = true; }
and see if that helps you debug
看看这是否可以帮助您调试
回答by Sivvy
Your code really should produce an error... C# is case sensitive, meaning frmRb is not the same as frmrb. Anyway, I copied it, created 2 forms and 3 buttons, and set up the handler, and it worked fine.
您的代码确实应该产生错误... C# 区分大小写，这意味着 frmRb 与 frmrb 不同。无论如何，我复制了它，创建了 2 个表单和 3 个按钮，并设置了处理程序，它运行良好。
private void InitializeComponent()
{
this.btnPd = new System.Windows.Forms.Button();
this.btnPd.Location = new System.Drawing.Point(90, 116);
this.btnPd.Name = "btnPd";
this.btnPd.Size = new System.Drawing.Size(75, 23);
this.btnPd.TabIndex = 1;
this.btnPd.Text = "button1";
this.btnPd.UseVisualStyleBackColor = true;
this.btnPd.Click += new System.EventHandler(this.btnPd_Click);
}
public System.Windows.Forms.Button btnRtn;
Are you sure you were handling btnPd? Perhaps you may have locked your enabling code inside a disabled button? Hopefully this small working sample helps you find the problem. As for the rest of the code, All I changed was the frmRb to frmrb so they match.
你确定你在处理 btnPd？也许您可能已将启用代码锁定在禁用按钮中？希望这个小的工作示例可以帮助您找到问题。至于其余的代码，我所做的只是将 frmRb 更改为 frmrb，以便它们匹配。
回答by ZokiManas
If the form that your are trying to show on the screen is properly shown, may be you can try this:
如果您尝试在屏幕上显示的表单正确显示，您可以尝试以下操作：
- Create a public method in the form that will set the button property enabled = true;
- After creating the form, and showing, you can call that public method;
- 在表单中创建一个公共方法，该方法将设置按钮属性 enabled = true;
- 创建表单并显示后，您可以调用该公共方法；
frmRb obj = new frmrb(); obj.EnableButton
frmRb obj = 新 frmrb(); obj.EnableButton
回答by user1869028
Pl check btnRtn situation if btnRtn is in panel or open ,if it in the panel pl check the panel enabled property and your coding is ok
如果 btnRtn 在面板中或打开，请检查 btnRtn 情况，如果它在面板中，请检查面板启用属性并且您的编码没问题
回答by Marcelo
SOLUTIONYou should never disable a button, or change it′s visibility before it is initialized, otherwise you won't be able to enable it again, or turn it visible again. Instead, you should disable it on it's own "Initialized" event, and then it will work properly! I had the same problem.
解决方案你永远不应该禁用一个按钮，或者在它被初始化之前改变它的可见性，否则你将无法再次启用它，或者让它再次可见。相反，您应该在它自己的“初始化”事件上禁用它，然后它就会正常工作！我有同样的问题。
