从Form2中的值更新Form1中的变量

本文关键字:Form1 变量 更新 Form2 | 更新日期: 2023-09-27 18:06:51

我有两个表单,第一个名为HomeForm,第二个名为cfgForm

我有变量,名称strCNF在HomeForm, strCNF的值从变量CNF在cfgForm。

下面是来自HomeForm的代码:
private void cnfRulesMenu_Click(object sender, EventArgs e)
{
    try
    {
        cfgForm cfgForm = new cfgForm(this);
        cfgForm.Show();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message.ToString(), "Error");
    }
}
// other parts....
public cfgForm cfg;
string strCNF = "";
strCNF = ((cfgForm)this.cfg).CNF;

然后,以另一种形式cfgForm,这里的代码:

public string CNF = "S -> NP VP" + System.Environment.NewLine +
                        "NP -> DT NN | QT NN | NP PP | NP RC | n | p" + System.Environment.NewLine +
                        "DT -> d" + System.Environment.NewLine +
                        "NN -> JJ NN | n" + System.Environment.NewLine +
                        "JJ -> JJ JJ | j" + System.Environment.NewLine +
                        "QT -> q" + System.Environment.NewLine +
                        "PP -> PT NP | GG PP" + System.Environment.NewLine +
                        "PT -> i" + System.Environment.NewLine +
                        "GG -> g" + System.Environment.NewLine +
                        "RC -> WH NP | WH VP" + System.Environment.NewLine +
                        "WH -> w" + System.Environment.NewLine;
    public cfgForm(HomeForm homeForm)
    {
        // TODO: Complete member initialization
        InitializeComponent();
        this.homeForm = homeForm;
    }
    private void btnDefaultCFG_Click(object sender, EventArgs e)
    {
        tbCNF.Text = CNF;
    }
    private void cfgForm_Load(object sender, EventArgs e)
    {
        tbCNF.Text = CNF;
        btnApplyCNF.Enabled = false;
    }
    private void btnApplyCNF_Click(object sender, EventArgs e)
    {
        //CNF = "";
        CNF = tbCNF.Text;
        HomeForm homeForm = new HomeForm();
        homeForm.cfg = this;
        //homeForm.ShowDialog(); 
        this.Hide();// doesn't work
    }
到目前为止,如果我使用homeForm.ShowDialog(),这些代码运行良好。我的意思是,cnfRulesMenu_Click是活跃的,并显示cfgForm站在HomeForm,然后我更新CNF变量在cfgForm,然后回到HomeForm,和cfgForm. hide。但是它给空值 有什么建议吗?

从Form2中的值更新Form1中的变量

因为你在这些代码中添加了另一个HomeForm

private void btnApplyCNF_Click(object sender, EventArgs e)
{
    //CNF = "";
    CNF = tbCNF.Text;
    HomeForm homeForm = new HomeForm();
    homeForm.cfg = this;
    //homeForm.ShowDialog(); 
    this.Hide();// doesn't work
}

所以,这些代码并没有像你希望的那样工作。

public cfgForm cfg;
string strCNF = "";
strCNF = ((cfgForm)this.cfg).CNF;

把你的代码修改成这些可能会解决你的问题,但是我必须说这些架构没有意义。

private void btnApplyCNF_Click(object sender, EventArgs e)
{
    //CNF = "";
    CNF = tbCNF.Text;
    this.homeForm.cfg = this;
    //homeForm.ShowDialog(); 
    this.Hide();// doesn't work
}