C# 从另一个表单c调用方法#
我有这样一个主窗体:C# 从另一个表单c调用方法#,c#,winforms,C#,Winforms,我有这样一个主窗体: public partial class MainForm : Form { string FileName = ""; public MainForm() { InitializeComponent(); } private void goToToolStripMenuItem_Click(object sender, EventArgs e) { } private void men
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();
}
}
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();
}
}
还有这样一种新形式:
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();
}
}
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();
}
}
在新表单中单击“保存”时,我需要在主表单中打开菜单项SaveAs。首先
public void MenuItemSaveAs()
然后
这假设您的表单是MainForm的子级。如果不是,则需要将对MainForm的引用传递到表单的构造函数中,并将其保存在本地。(还有一种方法可以始终找到当前节目的主要形式,但我认为这不是解决问题的优雅方法。)Melody,问题其实在于设计。表单不应调用其他表单中的GUI元素。这可能导致极难维护的“意大利面”代码。如果它是你试图以这种方式操纵的主要形式,你可以相信它存在,但它仍然违反了最佳实践。如果您试图以这种方式操纵其他表单,则必须处理表单不存在(尚未创建或已被处置)的可能性
如果代码需要操作表单的GUI,那么所说的代码应该在表单中。你能告诉我问题出在哪里吗?我想这是你应该告诉我和其他人的,而不是我:)这可能会有帮助,@Hogan,但问题很简单,不需要在谷歌上搜索,自从4个月前我如此频繁地注册和使用以来,这样的问题已经被问了至少几十次了。(这是我读过的,不是全部)。@KingKing-然后你应该单击close并标记为replicate,用指针指向其他地方的同一个问题。对提出问题的人下流不是一件好事——想象一下,如果你不知道这一点,却在问一个问题。另外,确保它是一个dup——例如,Angus的dup指针不是同一个问题context@MelodyHajian-请使用
P
而不是P
-大写。请注意,这是C
,而不是C++
错误的记事本。MainForm.MenuItemSaveAs()“由于其保护,无法访问level@MelodyHajian您需要将该方法公开:public void MenuItemSaveAs()
虽然这都是事实,但这并不能为如何不违反这些原则提供答案。