确定是否变更事件从用户输入或不发生 [英] Determine If Changed Event Occurred from User Input Or Not

问题描述

在C＃中，更改事件的控制（例如，一个的NumericUpDown）被炒鱿鱼的值是由用户直接更改，或者如果它被编程改变一些其他事件的结果。

有没有一种方法，以确定该事件是否发生作为用户输入的结果？例如，无论是手动更改NumericUpDown1中的价值，并点击按钮1，将显示价值变化。如果我只是想显示值改为如果它是通过在控制，而不是点击按钮1的结果？

上/下箭头用户点击修改

 私人无效numericUpDown1_ValueChanged（对象发件人，EventArgs的）
    {
        的MessageBox.show（值改为）;
    }

    私人无效button1_Click_1（对象发件人，EventArgs的）
    {
        numericUpDown1.Value = 3;
    }
 

解决方案

有没有好的办法做到这一点。你可以找到解决方法的具体情况，例如，

• 听的MouseDown或什么，而不是的valueChanged上的数字降下来了。

• 在设置按钮单击事件处理一个标志，将禁止该消息框无法显示。

  一般来说，你应该尽量组织的方式表单，它不无论身在何处的价值得到了改变。

In C#, the Changed event for a control (say, a numericupdown) gets fired whether the value was change directly by the user or if it was changed programatically as the result of some other event.

Is there a way to determine whether the event occurred as a result of user input? For example, both manually changing the value of numericUpDown1 and clicking on button1 will display "value changed". What if I only wanted to display "value changed" if it was changed through the user clicking on the up/down arrows in the control and not as a result of clicking on button1?

    private void numericUpDown1_ValueChanged(object sender, EventArgs e)
    {
        MessageBox.Show("value changed");
    }

    private void button1_Click_1(object sender, EventArgs e)
    {
        numericUpDown1.Value = 3;
    }

解决方案

There is no nice way to do it. You can find workarounds for specific cases, e.g.

• listen to MouseDown or something instead of valueChanged on the numeric drop down.

• Set a flag in button click event handler that will prohibit the message box from showing.

  In general you should try to organize your form in a way that it doesn't matter where the value got changed.

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