传递的Windows之间的值形状C＃ [英] Passing Values Between Windows Forms c#

问题描述

我在努力解决如何窗体间传递值。我有四种形式，我想通过由登录检索到的信息来的第四次也是最后的形式。

I am struggling to work out how to pass values between forms. I have four forms and I want to pass the information retrieved by the Login to the fourth and final form.

这是我迄今。

在此功能：

private void btnLogin_Click(object sender, EventArgs e)

我已经反序列化数据我想是这样的：

I have deserialized the data I want like this:

NewDataSet resultingMessage = (NewDataSet)serializer.Deserialize(rdr);

然后，当我叫下一个表格我已经这样做了：

Then, when I call the next form I have done this:

Form myFrm = new frmVoiceOver(resultingMessage);
myFrm.Show();

然后，我的的VoiceOver 的形式是这样的：

public frmVoiceOver(NewDataSet loginData)
{
    InitializeComponent();
}

private void btnVoiceOverNo_Click(object sender, EventArgs e)
{
    this.Close();
    Form myFrm = new frmClipInformation();
    myFrm.Show();
}

当我调试，我可以看到的数据是 loginData 在第二个形式，但我似乎无法访问它在 btnVoiceOverNo_Click 事件。如何访问它，所以我可以将它传递到下一个形式？

When I debug, I can see the data is in loginData in the second form, but I cannot seem to access it in the btnVoiceOverNo_Click event. How do I access it so I can pass it to the next form?

推荐答案

您需要把 loginData 进入里面的 frmVoiceOver 类，以便能够从其他方法来访问它。目前，它的作用范围是构造：

You need to put loginData into a local variable inside the frmVoiceOver class to be able to access it from other methods. Currently it is scoped to the constructor:

class frmVoiceOver : Form
{
    private NewDataSet _loginData;

    public frmVoiceOver(NewDataSet loginData)
    {
        _loginData = loginData;

        InitializeComponent();
    }

    private void btnVoiceOverNo_Click(object sender, EventArgs e)
    {
        // Use _loginData here.
        this.Close();
        Form myFrm = new frmClipInformation();
        myFrm.Show();
    }
}

此外，如果两种形式都在同一个进程可能你并不需要序列数据，并可以简单地把它作为一个标准的参考形式的构造。

Also, if the two forms are in the same process you likely don't need to serialize the data and can simply pass it as a standard reference to the form's constructor.

谷歌像 C＃变量范围了解更多这个区域，你会遇到这个概念所有的时间。我AP preciate你是自学成才，所以我只是想加强的是： - ）

Google something like "C# variable scope" to understand more in this area as you will encounter the concept all the time. I appreciate you are self-taught so I'm just trying to bolster that :-)

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