I am doing some of the C# walkthroughs to transition from
VB to C#. When I try to execute
static void Main()
{
Aplication.Run(new Form1())
}
I raise a 'System.NullReferenceException" in
system.windows.forms.dll
I am sure this is a simple fix, but I cannot find a answer.
Terrence 3 9060
Can you post the rest of your code? Without it, it's difficult to tell
what's going on....
Thanks,
- bliz
--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft
Your Potential. Our Passion.
This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to newsgroups only, so that others may benefit. Thanks.
-------------------- Content-Class: urn:content-classes:message From: "Terrence" <tr********@hotmail.com> Sender: "Terrence" <tr********@hotmail.com> Subject: System.NullReferenceException Date: Wed, 2 Jul 2003 20:14:49 -0700 Lines: 14 Message-ID: <08****************************@phx.gbl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Newsreader: Microsoft CDO for Windows 2000 Thread-Index: AcNBEUNX0JWNsBAcSKah7zscfgzN3g== X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Newsgroups: microsoft.public.dotnet.general Path: cpmsftngxa09.phx.gbl Xref: cpmsftngxa09.phx.gbl microsoft.public.dotnet.general:14499 NNTP-Posting-Host: TK2MSFTNGXA09 10.40.1.161 X-Tomcat-NG: microsoft.public.dotnet.general
I am doing some of the C# walkthroughs to transition from VB to C#. When I try to execute
static void Main() { Aplication.Run(new Form1()) }
I raise a 'System.NullReferenceException" in system.windows.forms.dll
I am sure this is a simple fix, but I cannot find a answer.
Terrence
Thanks for posting the code. It appears as though there's a bug in the
InitializeComponent method. You may want to take a look at the book
publisher's or author's web site to see if there's some erratta information
with corrections to the code.
Unfortunately I can't tell what's going on without even more information
regarding external references to things such as
AuthorsWinClient.localhost.authors1
Good luck!
-bliz
--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft
Your Potential. Our Passion.
This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to newsgroups only, so that others may benefit. Thanks.
-------------------- Content-Class: urn:content-classes:message From: "Terrence" <tr********@hotmail.com> Sender: "Terrence" <tr********@hotmail.com> References: <08****************************@phx.gbl>
<zH*************@cpmsftngxa09.phx.gbl>Subject: RE: System.NullReferenceException Date: Thu, 3 Jul 2003 07:10:32 -0700 Lines: 319 Message-ID: <0c****************************@phx.gbl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Newsreader: Microsoft CDO for Windows 2000 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Thread-Index: AcNBbN3Ax2+BDkEpRLCp7Qep1YyJAw== Newsgroups: microsoft.public.dotnet.general Path: cpmsftngxa09.phx.gbl Xref: cpmsftngxa09.phx.gbl microsoft.public.dotnet.general:14548 NNTP-Posting-Host: TK2MSFTNGXA11 10.40.1.163 X-Tomcat-NG: microsoft.public.dotnet.general
Here is the code; I will mark the line where the execution stops with <====
Also, I have included the contents of the Debug window following the code. ============================ CODE ====================== using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data;
namespace AuthorsWinClient { /// <summary> /// Summary description for Form1. /// </summary> public class frmMain : System.Windows.Forms.Form { private System.Windows.Forms.DataGrid dataGrid1; private System.Windows.Forms.Button SaveData; private System.Windows.Forms.Button LoadData; private AuthorsWinClient.localhost.authors1 AuthorData; /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null;
public frmMain() { // // Required for Windows Form Designer support // InitializeComponent();
// // TODO: Add any constructor code after InitializeComponent call // }
/// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose (); } } base.Dispose( disposing ); }
#region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.dataGrid1 = new System.Windows.Forms.DataGrid(); this.AuthorData = new AuthorsWinClient.localhost.authors1(); this.SaveData = new System.Windows.Forms.Button(); this.LoadData = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize) (this.dataGrid1)).BeginInit();
((System.ComponentModel.ISupportInitialize) (this.AuthorData)).BeginInit(); this.SuspendLayout(); // // dataGrid1 // this.dataGrid1.DataMember = "authors"; this.dataGrid1.DataSource = this.AuthorData; this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText; this.dataGrid1.Location = new System.Drawing.Point(8, 8); this.dataGrid1.Name = "dataGrid1"; this.dataGrid1.Size = new System.Drawing.Size(344, 184); this.dataGrid1.TabIndex = 0; // // AuthorData // this.AuthorData.DataSetName = "authors1"; this.AuthorData.Locale = new System.Globalization.CultureInfo("en-US"); // // SaveData // this.SaveData.Location = new System.Drawing.Point(216, 208); this.SaveData.Name = "SaveData"; this.SaveData.Size = new System.Drawing.Size(96, 24); this.SaveData.TabIndex = 1; this.SaveData.Text = "Save"; this.SaveData.Click += new System.EventHandler(this.SaveData_Click); // // LoadData // this.LoadData.Location = new System.Drawing.Point(40, 208); this.LoadData.Name = "LoadData"; this.LoadData.Size = new System.Drawing.Size(80, 24); this.LoadData.TabIndex = 2; this.LoadData.Text = "Load"; this.LoadData.Click += new System.EventHandler(this.LoadData_Click); // // frmMain // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(360, 245); this.Controls.Add(this.LoadData); this.Controls.Add(this.SaveData); this.Controls.Add(this.dataGrid1); this.Name = "frmMain"; this.Text = "Form Main";
((System.ComponentModel.ISupportInitialize) (this.dataGrid1)).EndInit();
((System.ComponentModel.ISupportInitialize) (this.AuthorData)).EndInit(); this.ResumeLayout(false);
} #endregion
/// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new frmMain()); } <==== Exception Thrown
private void LoadData_Click(object sender, System.EventArgs e) {
AuthorsWinClient.localhost.AuthorsService ws = new AuthorsWinClient.localhost.AuthorsService(); ws.Credentials = System.Net.CredentialCache.DefaultCredentials; AuthorData.Merge(ws.GetAuthors()); }
private void SaveData_Click(object sender, System.EventArgs e) {
AuthorsWinClient.localhost.AuthorsService ws = new AuthorsWinClient.localhost.AuthorsService(); ws.Credentials = System.Net.CredentialCache.DefaultCredentials;
AuthorsWinClient.localhost.authors1 diffAuthors = new AuthorsWinClient.localhost.authors1(); diffAuthors.Merge (AuthorData.GetChanges()); diffAuthors = ws.UpdateAuthors (diffAuthors); AuthorData.Merge(diffAuthors); } } } ======================= DEBUG ========================== 'DefaultDomain': Loaded 'c:\winnt\microsoft.net\framework\v1.1.4322 \mscorlib.dll', No symbols loaded. 'AuthorsWinClient': Loaded 'C:\Documents and Settings\tdaniel\My Documents\Visual Studio Projects\AuthorWebService\AuthorsWinClient\bin\De bug\Author sWinClient.exe', Symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.windows.forms\1.0.50 00 .0__b77a5c561934e089\system.windows.forms.dll', No symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system\1.0.5000.0__b77a5c56 19 34e089\system.dll', No symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.drawing\1.0.5000.0__ b0 3f5f7f11d50a3a\system.drawing.dll', No symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.data\1.0.5000.0__b77 a5 c561934e089\system.data.dll', No symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.xml\1.0.5000.0__b77a 5c 561934e089\system.xml.dll', No symbols loaded. An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll
Additional information: Object reference not set to an instance of an object.
Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object. at System.Windows.Forms.SafeNativeMethods.ShowWindow (HandleRef hWnd, Int32 nCmdShow) at System.Windows.Forms.Control.SetVisibleCore(Boolea n value) at System.Windows.Forms.Form.SetVisibleCore(Boolean value) at System.Windows.Forms.Control.set_Visible(Boolean value) at System.Windows.Forms.ThreadContext.RunMessageLoop Inner (Int32 reason, ApplicationContext context) at System.Windows.Forms.ThreadContext.RunMessageLoop (Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at AuthorsWinClient.frmMain.Main() in c:\documents and settings\tdaniel\my documents\visual studio projects\authorwebservice\authorswinclient\form1. cs:line 121The program '[3084] AuthorsWinClient.exe' has exited with code 0 (0x0).
-----Original Message----- Can you post the rest of your code? Without it, it's difficult to tellwhat's going on....
Thanks, - bliz -- Jim Blizzard Sr .NET Developer Evangelist Microsoft
Your Potential. Our Passion.
This posting is provided "AS IS" with no warranties, and confers no rights.Please reply to newsgroups only, so that others may benefit. Thanks.
--------------------Content-Class: urn:content-classes:message From: "Terrence" <tr********@hotmail.com> Sender: "Terrence" <tr********@hotmail.com> Subject: System.NullReferenceException Date: Wed, 2 Jul 2003 20:14:49 -0700 Lines: 14 Message-ID: <08****************************@phx.gbl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Newsreader: Microsoft CDO for Windows 2000 Thread-Index: AcNBEUNX0JWNsBAcSKah7zscfgzN3g== X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Newsgroups: microsoft.public.dotnet.general Path: cpmsftngxa09.phx.gbl Xref: cpmsftngxa09.phx.gblmicrosoft.public.dotnet.general:14499NNTP-Posting-Host: TK2MSFTNGXA09 10.40.1.161 X-Tomcat-NG: microsoft.public.dotnet.general
I am doing some of the C# walkthroughs to transitionfromVB to C#. When I try to execute
static void Main() { Aplication.Run(new Form1()) }
I raise a 'System.NullReferenceException" in system.windows.forms.dll
I am sure this is a simple fix, but I cannot find aanswer. Terrence
.
Let me take a look at the sample app.
Thanks,
- bliz
--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft
Your Potential. Our Passion.
This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to newsgroups only, so that others may benefit. Thanks.
-------------------- Content-Class: urn:content-classes:message From: "Terrence" <tr********@hotmail.com> Sender: "Terrence" <tr********@hotmail.com> References: <08****************************@phx.gbl>
<zH*************@cpmsftngxa09.phx.gbl>
<0c****************************@phx.gbl>
<X4**************@cpmsftngxa09.phx.gbl>Subject: RE: System.NullReferenceException Date: Thu, 3 Jul 2003 08:01:12 -0700 Lines: 397 Message-ID: <50****************************@phx.gbl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Newsreader: Microsoft CDO for Windows 2000 Thread-Index: AcNBc/GGEtBG3tHWTS2AU6Ql41txxg== X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Newsgroups: microsoft.public.dotnet.general Path: cpmsftngxa09.phx.gbl Xref: cpmsftngxa09.phx.gbl microsoft.public.dotnet.general:14562 NNTP-Posting-Host: TK2MSFTNGXA12 10.40.1.164 X-Tomcat-NG: microsoft.public.dotnet.general
Jim,
This is the code from MS VS.NET 2003 documentation/C# Walkthrough/Simple Distributed App - Typed verbatim. I have done the same walkthrough using VS.NET (on home box) and it ran. Any thoughts?
-----Original Message----- Thanks for posting the code. It appears as though there's a bug in theInitializeComponent method. You may want to take a look at the bookpublisher's or author's web site to see if there's some erratta informationwith corrections to the code.
Unfortunately I can't tell what's going on without even more informationregarding external references to things such as AuthorsWinClient.localhost.authors1
Good luck! -bliz
-- Jim Blizzard Sr .NET Developer Evangelist Microsoft
Your Potential. Our Passion.
This posting is provided "AS IS" with no warranties, and confers no rights.Please reply to newsgroups only, so that others may benefit. Thanks.
--------------------Content-Class: urn:content-classes:message From: "Terrence" <tr********@hotmail.com> Sender: "Terrence" <tr********@hotmail.com> References: <08****************************@phx.gbl> <zH*************@cpmsftngxa09.phx.gbl>Subject: RE: System.NullReferenceException Date: Thu, 3 Jul 2003 07:10:32 -0700 Lines: 319 Message-ID: <0c****************************@phx.gbl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Newsreader: Microsoft CDO for Windows 2000 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Thread-Index: AcNBbN3Ax2+BDkEpRLCp7Qep1YyJAw== Newsgroups: microsoft.public.dotnet.general Path: cpmsftngxa09.phx.gbl Xref: cpmsftngxa09.phx.gblmicrosoft.public.dotnet.general:14548NNTP-Posting-Host: TK2MSFTNGXA11 10.40.1.163 X-Tomcat-NG: microsoft.public.dotnet.general
Here is the code; I will mark the line where theexecutionstops with <====
Also, I have included the contents of the Debug window following the code. ============================ CODE ====================== using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data;
namespace AuthorsWinClient { /// <summary> /// Summary description for Form1. /// </summary> public class frmMain : System.Windows.Forms.Form { private System.Windows.Forms.DataGrid dataGrid1; private System.Windows.Forms.Button SaveData; private System.Windows.Forms.Button LoadData; private AuthorsWinClient.localhost.authors1 AuthorData; /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null;
public frmMain() { // // Required for Windows Form Designer support // InitializeComponent();
// // TODO: Add any constructor code after InitializeComponent call // }
/// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose (); } } base.Dispose( disposing ); }
#region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.dataGrid1 = new System.Windows.Forms.DataGrid(); this.AuthorData = new AuthorsWinClient.localhost.authors1(); this.SaveData = new System.Windows.Forms.Button(); this.LoadData = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize) (this.dataGrid1)).BeginInit();
((System.ComponentModel.ISupportInitialize) (this.AuthorData)).BeginInit(); this.SuspendLayout(); // // dataGrid1 // this.dataGrid1.DataMember = "authors"; this.dataGrid1.DataSource = this.AuthorData; this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText; this.dataGrid1.Location = new System.Drawing.Point(8, 8); this.dataGrid1.Name = "dataGrid1"; this.dataGrid1.Size = new System.Drawing.Size(344, 184); this.dataGrid1.TabIndex = 0; // // AuthorData // this.AuthorData.DataSetName = "authors1"; this.AuthorData.Locale = new System.Globalization.CultureInfo("en-US"); // // SaveData // this.SaveData.Location = new System.Drawing.Point(216, 208); this.SaveData.Name = "SaveData"; this.SaveData.Size = new System.Drawing.Size(96, 24); this.SaveData.TabIndex = 1; this.SaveData.Text = "Save"; this.SaveData.Click += new System.EventHandler(this.SaveData_Click); // // LoadData // this.LoadData.Location = new System.Drawing.Point(40, 208); this.LoadData.Name = "LoadData"; this.LoadData.Size = new System.Drawing.Size(80, 24); this.LoadData.TabIndex = 2; this.LoadData.Text = "Load"; this.LoadData.Click += new System.EventHandler(this.LoadData_Click); // // frmMain // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(360, 245); this.Controls.Add(this.LoadData); this.Controls.Add(this.SaveData); this.Controls.Add(this.dataGrid1); this.Name = "frmMain"; this.Text = "Form Main";
((System.ComponentModel.ISupportInitialize) (this.dataGrid1)).EndInit();
((System.ComponentModel.ISupportInitialize) (this.AuthorData)).EndInit(); this.ResumeLayout(false);
} #endregion
/// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new frmMain()); } <==== Exception Thrown
private void LoadData_Click(object sender, System.EventArgs e) {
AuthorsWinClient.localhost.AuthorsService ws = new AuthorsWinClient.localhost.AuthorsService(); ws.Credentials = System.Net.CredentialCache.DefaultCredentials ; AuthorData.Merge(ws.GetAuthors()); }
private void SaveData_Click(object sender, System.EventArgs e) {
AuthorsWinClient.localhost.AuthorsService ws = new AuthorsWinClient.localhost.AuthorsService(); ws.Credentials = System.Net.CredentialCache.DefaultCredentials ;
AuthorsWinClient.localhost.authors1 diffAuthors = new AuthorsWinClient.localhost.authors1(); diffAuthors.Merge (AuthorData.GetChanges()); diffAuthors = ws.UpdateAuthors (diffAuthors); AuthorData.Merge(diffAuthors); } } } ======================= DEBUG ========================== 'DefaultDomain': Loaded 'c:\winnt\microsoft.net\framework\v1.1.4322 \mscorlib.dll', No symbols loaded. 'AuthorsWinClient': Loaded 'C:\Documents and Settings\tdaniel\My Documents\Visual Studio Projects\AuthorWebService\AuthorsWinClient\bin\ Debug\AuthorsWinClient.exe', Symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.windows.forms\1.0.5000.0__b77a5c561934e089\system.windows.forms.dll ', Nosymbolsloaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system\1.0.5000.0__b77a5c561934e089\system.dll', No symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.drawing\1.0.5000.0__b03f5f7f11d50a3a\system.drawing.dll', No symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.data\1.0.5000.0__b77a5c561934e089\system.data.dll', No symbols loaded. 'AuthorsWinClient.exe': Loaded 'c:\winnt\assembly\gac\system.xml\1.0.5000.0__b77a5c561934e089\system.xml.dll', No symbols loaded. An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll
Additional information: Object reference not set to an instance of an object.
Unhandled Exception: System.NullReferenceException:Objectreference not set to an instance of an object. at System.Windows.Forms.SafeNativeMethods.ShowWindow (HandleRef hWnd, Int32 nCmdShow) at System.Windows.Forms.Control.SetVisibleCore(Booleanvalue) at System.Windows.Forms.Form.SetVisibleCore(Boolean value) at System.Windows.Forms.Control.set_Visible(Boolean value) at System.Windows.Forms.ThreadContext.RunMessageLo opInner (Int32 reason, ApplicationContext context) at System.Windows.Forms.ThreadContext.RunMessageLoop (Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at AuthorsWinClient.frmMain.Main() in c:\documentsandsettings\tdaniel\my documents\visual studio projects\authorwebservice\authorswinclient\form 1.cs:line 121The program '[3084] AuthorsWinClient.exe' has exited with code 0 (0x0).
-----Original Message----- Can you post the rest of your code? Without it, it's difficult to tell what's going on....
Thanks, - bliz -- Jim Blizzard Sr .NET Developer Evangelist Microsoft
Your Potential. Our Passion.
This posting is provided "AS IS" with no warranties,andconfers no rights. Please reply to newsgroups only, so that others may benefit. Thanks.
-------------------- >Content-Class: urn:content-classes:message >From: "Terrence" <tr********@hotmail.com> >Sender: "Terrence" <tr********@hotmail.com> >Subject: System.NullReferenceException >Date: Wed, 2 Jul 2003 20:14:49 -0700 >Lines: 14 >Message-ID: <08****************************@phx.gbl> >MIME-Version: 1.0 >Content-Type: text/plain; > charset="iso-8859-1" >Content-Transfer-Encoding: 7bit >X-Newsreader: Microsoft CDO for Windows 2000 >Thread-Index: AcNBEUNX0JWNsBAcSKah7zscfgzN3g== >X-MimeOLE: Produced By Microsoft MimeOLEV5.50.4910.0300>Newsgroups: microsoft.public.dotnet.general >Path: cpmsftngxa09.phx.gbl >Xref: cpmsftngxa09.phx.gbl microsoft.public.dotnet.general:14499 >NNTP-Posting-Host: TK2MSFTNGXA09 10.40.1.161 >X-Tomcat-NG: microsoft.public.dotnet.general > >I am doing some of the C# walkthroughs to transition from >VB to C#. When I try to execute > >static void Main() >{ >Aplication.Run(new Form1()) >} > >I raise a 'System.NullReferenceException" in >system.windows.forms.dll > >I am sure this is a simple fix, but I cannot find a answer. > >Terrence >
.
.
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