c# - 从另一个窗体调用方法 C#

Question

我有一个像这样的 Mainform:

public partial class MainForm : Form
{
    string FileName = "";

    public MainForm()
    {
        InitializeComponent();
    }

    private void goToToolStripMenuItem_Click(object sender, EventArgs e)
    {

    }

    private void menuItem_Click(object sender, EventArgs e)
    {
        ToolStripMenuItem menuItem = (ToolStripMenuItem ) sender;

        switch (menuItem.Name.Replace("ToolStripMenuItem",""))
        {
            case "new":
                MenuItemNew();
                break; 
            case "open" :
                MenuItemOpen();
                break;
            case "save":
                MenuItemSave();
                break;
            case "saveAs" :
                MenuItemSaveAs();
                break;
          case "exit" :
                MenuItemExit();
                break;
            case "selectAll" :
                MenuItemSelectAll();
                break;
        }
    }

    private void MenuItemSelectAll()
    {
        textBox.SelectAll();
    }

    private void MenuItemExit()
    {
        this.Close();
    }

    private void MenuItemSaveAs()
    {
        SaveFileDialog sfd = new SaveFileDialog();
        sfd.Filter = "Text Document |*.txt";
        if (sfd.ShowDialog() == DialogResult.OK)
        {
            StreamWriter writer = new StreamWriter(sfd.FileName);
            writer.Write(textBox.Text);
            writer.Close();
        }
    }

    private void MenuItemSave()
    {
        if (FileName == "")
        {
            MenuItemSaveAs();
        }
        else
        {
            StreamWriter writer = new StreamWriter(FileName);
            writer.Write(textBox.Text);
            writer.Close();
        }
    }

    private void MenuItemOpen()
    {
        OpenFileDialog ofd = new OpenFileDialog();
        ofd.Filter = "Text Document|*.txt";
        if (ofd.ShowDialog() == DialogResult.OK)
        {
            FileName = ofd.FileName;
            StreamReader reader = new StreamReader(ofd.FileName);
            textBox.Text = reader.ReadToEnd();
            reader.Close();
        }
    }

    private void MenuItemNew()
    {
        if (textBox.Text == "")
        {
            textBox.Text = String.Empty;
        }
        else
            this.Show();
            Newform sistema=new Newform();
        sistema.ShowDialog();
    }
}

还有一个像这样的 Newform:

public partial class Newform : Form
{
    public Newform()
    {
        InitializeComponent();
    }

    private void cancel_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void dontsave_click(object sender, EventArgs e)
    {

    }

    private void save_Click(object sender, EventArgs e)
    {
        this.Hide();
    }
}

在我的新表单中单击保存时，我需要 MenuItemSaveAs 在我的主表单中打开。

Answer 1

首先

 public void MenuItemSaveAs()

然后

private void save_Click(object sender, EventArgs e)
{
    this.Hide();   
    ((MainForm)Parent).MenuItemSaveAs()
}

这假定您的表单是 MainForm 的子表单。如果不是，则需要将对 MainForm 的引用传递到窗体的构造函数中并将其保存在本地。 (还有一种方法可以始终找到当前程序的主窗体，但我认为这不是解决问题的优雅方法。)