How to fix it error that Sysytem.windows.form AxHost.InvalidActiveXStateException " was through

Question

2.33/5 (3 votes)

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M using folloing code but I get Sysytem.windows.form AxHost.InvalidActiveXStateException error..

C#

OpenFileDialog openFileDialog1 = new OpenFileDialog();
            //openFileDialog1.InitialDirectory = Application.StartupPath + "\\Reports\\";
            openFileDialog1.RestoreDirectory = true;
            openFileDialog1.Filter = "Pdf Files|*.pdf";
                try
                {
                   if (openFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                     
                        AxAcroPDF a = new AxAcroPDF();
                        a.LoadFile(Application.StartupPath + "\\Reports\\");
                        a.Show();
                                        
                    }
                }
                catch (ArgumentException  ex)
                {
                    MessageBox.Show(ex.Message.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }

Posted 1-Aug-14 21:48pm

Dipika Wani

Updated 14-May-17 21:07pm

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4 solutions

Solution 1

Hello Dipika.

I think you want to Open the PDF-File inside Acrobat ?

That Code seems allright to me. But the message says it was not in the right [mood ;)] State.

If it is only needed to display the PDF file use the .NET builtin Webrowser and pass that file to that Control. Ist so frustrating with ActiveX Interop.

Maybe i didnt solved that Code issue but for a PDF Reader there is no need for that task anymore.

c.u. an happy coding

Posted 2-Aug-14 1:58am

Jaroslav Mitrovic

Solution 2

For each and every active x control, it is needed to create it first, so that all the events and handles should be initialized.

try.. :)

C#

AxAcroPDF.CreateControl()

[Solved] System.Windows.Forms.AxHost.InvalidActiveXStateException was unhandled[^]

AxHost.InvalidActiveXStateException[^]

Posted 2-Aug-14 2:06am

Nirav Prabtani

Comments

Dipika Wani 4-Aug-14 1:09am

@nirav prabtani- I used "axAcroPDF1.CreateControl();" before loading file from path but still getting same error that " Exception of type 'System.Windows.Forms.AxHost+InvalidActiveXStateException' was thrown."
please help me. If there any other option then plz tel me.

Dipika Wani 4-Aug-14 4:36am

please reply me some one. Its urgent.

Solution 4

I want to add something to the solution:

I get the filename from:

C#

string[] DirectoryFiles = System.IO.Directory.GetFiles(DirectoryName);

When I use this:

a.CreateControl()
a.LoadFile(DirectoryFiles[0]);
a.Show();

I get the error mentioned in this question.

The solution is to put an @ in front of the file to be loaded:

a.CreateControl()
a.LoadFile(@DirectoryFiles[0]);
a.Show();

As this is the top result when googling for this error i hope I can help people like me who forgot the @ is necessary.

Posted 14-May-17 21:07pm

RobScripta

Comments

CHill60 15-May-17 8:16am

You do not need to use the "@" character unless you have a literal string.

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Jaroslav Mitrovic · Accepted Answer · 2014-08-07T04:52:00

Hello again.

C#

AxAcroPDF a = new AxAcroPDF();
                    a.LoadFile(Application.StartupPath + "\\Reports\\");
                    a.Show();

Your Variable/Instance is named a

I think you need to try this instead.

C#

a.CreateControl()
a.LoadFile(Application.StartupPath + &quot;\\Reports\\&quot;);
a.Show();

AxAcroPDF is the Type of Control, and a is the Instance, which will be shown with the selected PDF document.

Wrong:

axAcroPDF1.CreateControl();

Right

a.CreateControl();

If the Code in the first Question doesn´t changed meanwhile.

...even if this is Answer is marked as solved. Don´t hit me with that thing... ;)

c.u.