mdi application

I am having trouble communicating with my mdiParent from a child form. I am trying enable some menu items on the mdi parent when a user logs in successfully in frmLogin. I am able to pass info to setPermissions(bool enabled) and I step through the code and it shows that each menu item's enabled property is changed to true but when I go up to the menu again they are still not enabled. what should i do? this code is in the parent: public void setPermissions(bool access) { this.mnuLogon.Enabled = !access; this.mnuLogout.Enabled = access; this.mnuSpending.Enabled = access; this.mnuCurrent.Enabled = access; this.mnuTransactions.Enabled = access; this.mnuDebt.Enabled = access; } this is the code in the child: private void cmdOK_Click(object sender, System.EventArgs e) { int login = data.login(txtLogin.Text.ToString(), txtPassword.Text.ToString()); switch(login) { case 0: MessageBox.Show("Invalid Login Name or Password"); txtLogin.Focus(); break; case 1: frm.setPermissions(true); this.Hide(); break; case 2: frm.setPermissions(true); this.Hide(); break; default: MessageBox.Show("Invalid Login Name or Password"); txtLogin.Focus(); break; } } am i missing something obvious? I am fairly new to C#. Thanks, Pete

Put these two files into aprojects & you can see how it is done ----------- FormParent ------------------------ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace WindowsApplication1 { ///

/// Summary description for Form1. ///

public class FormParent : System.Windows.Forms.Form { private System.Windows.Forms.MainMenu mainMenu1; private System.Windows.Forms.MenuItem menuItem1; private System.Windows.Forms.MenuItem menuItem2; private System.Windows.Forms.MenuItem menuItem3; ///

/// Required designer variable. ///

private System.ComponentModel.Container components = null; public FormParent() { // // Required for Windows Form Designer support // InitializeComponent(); } ///

/// Clean up any resources being used. ///

protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code ///

/// Required method for Designer support - do not modify /// the contents of this method with the code editor. ///

private void InitializeComponent() { this.mainMenu1 = new System.Windows.Forms.MainMenu(); this.menuItem1 = new System.Windows.Forms.MenuItem(); this.menuItem2 = new System.Windows.Forms.MenuItem(); this.menuItem3 = new System.Windows.Forms.MenuItem(); // // mainMenu1 // this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { this.menuItem1}); // // menuItem1 // this.menuItem1.Index = 0; this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { this.menuItem2, this.menuItem3}); this.menuItem1.Text = "File"; // // menuItem2 // this.menuItem2.Index = 0; this.menuItem2.Text = "Two"; // // menuItem3 // this.menuItem3.Index = 1; this.menuItem3.Text = "Three"; // // FormParent // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(560, 397); this.IsMdiContainer = true; this.Menu = this.mainMenu1; this.Name = "FormParent"; this.Text = "Container"; this.Load += new System.EventHandler(this.FormParent_Load); } #endregion ///

/// The main entry point for the application. ///

[STAThread] static void Main() { Application.Run(new FormParent()); } private void FormParent_Load(object sender, System.EventArgs e) { FormChild frmChild = new FormChild(); frmChild.MdiParent = this; frmChild.Show(); } public void setPermissions(bool access) { this.menuItem2.Enabled = access; this.menuItem3.Enabled = access; } } } ----------- FormChild ------------------------ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; namespace WindowsApplication1 { ///

/// Summary description for Form2. ///

public class FormChild : System.Windows.Forms.Form { private System.Windows.Forms.Button button1; ///

/// Required designer variable. ///

private System.ComponentModel.Container components = null; public FormChild() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } ///

/// Clean up any resources being used. ///

protected override void Dispose( bool disposing ) { if( disposing ) { if(components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code ///

/// Required method for Designer support - do not modify /// the contents of this method with the code editor. ///

private void InitializeComponent() { this.button1 = new System.Windows.Forms.Button(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(40, 84); this.button1.Name = "button1"; this.button1.TabIndex = 0; this.button1.Text = "enabled"; this.button1.Click += new System.EventHandler(this.button1_Click); // // FormChild // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.button1); this.Name = "FormChild"; this.Text = "2"; this.ResumeLayout(false); } #endregion private void button1_Click(object sender, System.EventArgs e) { if (button1.Text.Equals("enabled")) { button1.Text = "disbaled"; } else { button1.Text = "enabled"; } ((FormParent)this.MdiParent).setPermissions(button1.Text.Equals("enabled")); } } }

2 Replies

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pete.mcnamee23y ago
Thanks a lot. I finally found what I was looking for in another post last night. I was missing the MdiParent reference. I had tried it so many different ways.
+1
seamus23y ago
Put these two files into aprojects & you can see how it is done ----------- FormParent ------------------------ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace WindowsApplication1 { ///
/// Summary description for Form1. ///
public class FormParent : System.Windows.Forms.Form { private System.Windows.Forms.MainMenu mainMenu1; private System.Windows.Forms.MenuItem menuItem1; private System.Windows.Forms.MenuItem menuItem2; private System.Windows.Forms.MenuItem menuItem3; ///
/// Required designer variable. ///
private System.ComponentModel.Container components = null; public FormParent() { // // Required for Windows Form Designer support // InitializeComponent(); } ///
/// Clean up any resources being used. ///
protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code ///
/// Required method for Designer support - do not modify /// the contents of this method with the code editor. ///
private void InitializeComponent() { this.mainMenu1 = new System.Windows.Forms.MainMenu(); this.menuItem1 = new System.Windows.Forms.MenuItem(); this.menuItem2 = new System.Windows.Forms.MenuItem(); this.menuItem3 = new System.Windows.Forms.MenuItem(); // // mainMenu1 // this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { this.menuItem1}); // // menuItem1 // this.menuItem1.Index = 0; this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { this.menuItem2, this.menuItem3}); this.menuItem1.Text = "File"; // // menuItem2 // this.menuItem2.Index = 0; this.menuItem2.Text = "Two"; // // menuItem3 // this.menuItem3.Index = 1; this.menuItem3.Text = "Three"; // // FormParent // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(560, 397); this.IsMdiContainer = true; this.Menu = this.mainMenu1; this.Name = "FormParent"; this.Text = "Container"; this.Load += new System.EventHandler(this.FormParent_Load); } #endregion ///
/// The main entry point for the application. ///
[STAThread] static void Main() { Application.Run(new FormParent()); } private void FormParent_Load(object sender, System.EventArgs e) { FormChild frmChild = new FormChild(); frmChild.MdiParent = this; frmChild.Show(); } public void setPermissions(bool access) { this.menuItem2.Enabled = access; this.menuItem3.Enabled = access; } } } ----------- FormChild ------------------------ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; namespace WindowsApplication1 { ///
/// Summary description for Form2. ///
public class FormChild : System.Windows.Forms.Form { private System.Windows.Forms.Button button1; ///
/// Required designer variable. ///
private System.ComponentModel.Container components = null; public FormChild() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } ///
/// Clean up any resources being used. ///
protected override void Dispose( bool disposing ) { if( disposing ) { if(components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code ///
/// Required method for Designer support - do not modify /// the contents of this method with the code editor. ///
private void InitializeComponent() { this.button1 = new System.Windows.Forms.Button(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(40, 84); this.button1.Name = "button1"; this.button1.TabIndex = 0; this.button1.Text = "enabled"; this.button1.Click += new System.EventHandler(this.button1_Click); // // FormChild // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.button1); this.Name = "FormChild"; this.Text = "2"; this.ResumeLayout(false); } #endregion private void button1_Click(object sender, System.EventArgs e) { if (button1.Text.Equals("enabled")) { button1.Text = "disbaled"; } else { button1.Text = "enabled"; } ((FormParent)this.MdiParent).setPermissions(button1.Text.Equals("enabled")); } } }
+1