How to open an Excel file in C

Question

I am trying to convert some VBA code to C   I am new to C   Currently I am trying to open an Excel file from a folder and if it does not exist then create it  I am trying something like the following  How can I make it work   Excel Application objexcel  Excel Workbook wbexcel  bool wbexists  Excel Worksheet objsht  Excel Range objrange   objexcel   new Excel Application    if  Directory  C   csharp  error report1 xls               wbexcel NewSheet       else       wbexcel Open  C   csharp  error report1 xls        objsht     sheet1      objsht Activate

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open Excel file  System Diagnostics Process Start   c  document xls

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Is this a commercial application or some hobbyist   open source software   I m asking this because in my experience  all free  NET Excel handling alternatives have serious problems  for different reasons  For hobbyist things  I usually end up porting jExcelApi from Java to C  and using it   But if this is a commercial application  you would be better off by purchasing a third party library  like Aspose Cells  Believe me  it totally worths it as it saves a lot of time and time ain t free

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You need to have installed Microsoft Visual Studio Tools for Office  VSTO    VSTO can be selected in the Visual Studio installer under Workloads   Web  amp  Cloud   Office SharePoint Development   After that create common  NET project and add the reference to  Microsoft Office Interop Excel via  Add Reference      Assemblies  dialog   Application excel   new Application    Workbook wb   excel Workbooks Open path     Missing Value is a special reflection struct for unnecessary parameters replacement    In newer versions  the assembly reference required is called Microsoft Excel 16 0 Object Library  If you do not have the latest version installed you might have Microsoft Excel 15 0 Object Library  or an older version  but it is the same process to include

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Microsoft Office Interop Excel Application excapp   excapp   new Microsoft Office Interop Excel Application     object misval System Reflection Missing Value   Workbook wrkbuk   new Workbook     Worksheet wrksht   new Worksheet     wrkbuk   excapp Workbooks  Open   C  Users         template v1 0 xlsx   misval  misval   misval  misval  misval  misval  misval  misval  misval  misval  misval  misval    wrksht    Microsoft Office Interop Excel Worksheet wrkbuk Worksheets get Item 2

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For opening a file  try this   objexcel Workbooks Open   C  YourPath YourExcelFile xls       missing  missing  missing  missing  missing  missing  missing      missing  missing  missing  missing  missing missing  missing     You must supply those stupid looking  missing  arguments  If you were writing the same code in VB Net you wouldn t have needed them  but you can t avoid them in C

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Imports   using Excel  Microsoft Office Interop Excel   using Microsoft VisualStudio Tools Applications Runtime    Here is the code to open an excel sheet using C        Microsoft Office Interop Excel Application excel   new Microsoft Office Interop Excel Application        Microsoft Office Interop Excel Workbook wbv   excel Workbooks Open  C   YourExcelSheet xlsx        Microsoft Office Interop Excel Worksheet wx   excel ActiveSheet as Microsoft Office Interop Excel Worksheet       wbv Close true  Type Missing  Type Missing       excel Quit      Here is a video mate on how to open an excel worksheet using C  https   www youtube com watch v O5Dnv0tfGv4

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private void btnChoose2 Click object sender  EventArgs e      OpenFileDialog openfileDialog1   new OpenFileDialog      if  openfileDialog1 ShowDialog      System Windows Forms DialogResult OK          this btnChoose2 Text   openfileDialog1 FileName      String filename   DialogResult ToString         var excelApp   new Excel Application        excelApp Visible   true      excelApp Workbooks Open btnChoose2 Text

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private void btnChoose2 Click object sender  EventArgs e      OpenFileDialog openfileDialog1   new OpenFileDialog      if  openfileDialog1 ShowDialog      System Windows Forms DialogResult OK          this btnChoose2 Text   openfileDialog1 FileName      String filename   DialogResult ToString         var excelApp   new Excel Application        excelApp Visible   true      excelApp Workbooks Open btnChoose2 Text

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For editing Excel files from within a C  application  I recently started using NPOI  I m very satisfied with it

User · Answer

You need to have installed Microsoft Visual Studio Tools for Office  VSTO    VSTO can be selected in the Visual Studio installer under Workloads   Web  amp  Cloud   Office SharePoint Development   After that create common  NET project and add the reference to  Microsoft Office Interop Excel via  Add Reference      Assemblies  dialog   Application excel   new Application    Workbook wb   excel Workbooks Open path     Missing Value is a special reflection struct for unnecessary parameters replacement    In newer versions  the assembly reference required is called Microsoft Excel 16 0 Object Library  If you do not have the latest version installed you might have Microsoft Excel 15 0 Object Library  or an older version  but it is the same process to include

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you should open like this          Excel Application xlApp           Excel Workbook xlWorkBook           Excel Worksheet xlWorkSheet           object misValue   System Reflection Missing Value           xlApp   new Excel ApplicationClass            xlWorkBook   xlApp Workbooks Open  csharp net-informations xls   0  true  5          true  Microsoft Office Interop Excel XlPlatform xlWindows    t   false  false  0  true  1  0           xlWorkSheet    Excel Worksheet xlWorkBook Worksheets get Item 1     source   http   csharp net-informations com excel csharp-open-excel htm  ruden

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Code     private void button1 Click object sender  EventArgs e                  textBox1 Enabled false               OpenFileDialog ofd   new OpenFileDialog                ofd Filter    Excell File    xlsx   xlsx               if  ofd ShowDialog      DialogResult OK                                string extn   Path GetExtension ofd FileName                   if  extn Equals   xls      extn Equals   xlsx                                          filename   ofd FileName                       if  filename                                                      try                                                       string excelfilename   Path GetFileName filename                                                       catch  Exception ew                                                        MessageBox Show  Errror     ew ToString

User · Answer

For opening a file  try this   objexcel Workbooks Open   C  YourPath YourExcelFile xls       missing  missing  missing  missing  missing  missing  missing      missing  missing  missing  missing  missing missing  missing     You must supply those stupid looking  missing  arguments  If you were writing the same code in VB Net you wouldn t have needed them  but you can t avoid them in C

User · Answer

Is this a commercial application or some hobbyist   open source software   I m asking this because in my experience  all free  NET Excel handling alternatives have serious problems  for different reasons  For hobbyist things  I usually end up porting jExcelApi from Java to C  and using it   But if this is a commercial application  you would be better off by purchasing a third party library  like Aspose Cells  Believe me  it totally worths it as it saves a lot of time and time ain t free

User · Answer

open Excel file  System Diagnostics Process Start   c  document xls

User · Answer

You need to have installed Microsoft Visual Studio Tools for Office  VSTO    VSTO can be selected in the Visual Studio installer under Workloads   Web  amp  Cloud   Office SharePoint Development   After that create common  NET project and add the reference to  Microsoft Office Interop Excel via  Add Reference      Assemblies  dialog   Application excel   new Application    Workbook wb   excel Workbooks Open path     Missing Value is a special reflection struct for unnecessary parameters replacement    In newer versions  the assembly reference required is called Microsoft Excel 16 0 Object Library  If you do not have the latest version installed you might have Microsoft Excel 15 0 Object Library  or an older version  but it is the same process to include

User · Answer

It s easier to help you if you say what s wrong as well  or what fails when you run it   But from a quick glance you ve confused a few things   The following doesn t work because of a couple of issues   if  Directory  C   csharp  error report1 xls           What you are trying to do is creating a new Directory object that should point to a file and then check if there was any errors    What you are actually doing is trying to call a function named Directory   and then assign a string to the result  This won t work since 1  you don t have a function named Directory string str  and you cannot assign to the result from a function  you can only assign a value to a variable    What you should do  for this line at least  is the following  FileInfo fi   new FileInfo  C   csharp  error report1 xls    if  fi Exists           Create the xl file here   else          Open file here     As to why the Excel code doesn t work  you have to check the documentation for the Excel library which google should be able to provide for you

User · Answer

Code     private void button1 Click object sender  EventArgs e                  textBox1 Enabled false               OpenFileDialog ofd   new OpenFileDialog                ofd Filter    Excell File    xlsx   xlsx               if  ofd ShowDialog      DialogResult OK                                string extn   Path GetExtension ofd FileName                   if  extn Equals   xls      extn Equals   xlsx                                          filename   ofd FileName                       if  filename                                                      try                                                       string excelfilename   Path GetFileName filename                                                       catch  Exception ew                                                        MessageBox Show  Errror     ew ToString

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you should open like this          Excel Application xlApp           Excel Workbook xlWorkBook           Excel Worksheet xlWorkSheet           object misValue   System Reflection Missing Value           xlApp   new Excel ApplicationClass            xlWorkBook   xlApp Workbooks Open  csharp net-informations xls   0  true  5          true  Microsoft Office Interop Excel XlPlatform xlWindows    t   false  false  0  true  1  0           xlWorkSheet    Excel Worksheet xlWorkBook Worksheets get Item 1     source   http   csharp net-informations com excel csharp-open-excel htm  ruden

User · Answer

For opening a file  try this   objexcel Workbooks Open   C  YourPath YourExcelFile xls       missing  missing  missing  missing  missing  missing  missing      missing  missing  missing  missing  missing missing  missing     You must supply those stupid looking  missing  arguments  If you were writing the same code in VB Net you wouldn t have needed them  but you can t avoid them in C

User · Answer

For editing Excel files from within a C  application  I recently started using NPOI  I m very satisfied with it

User · Answer

Is this a commercial application or some hobbyist   open source software   I m asking this because in my experience  all free  NET Excel handling alternatives have serious problems  for different reasons  For hobbyist things  I usually end up porting jExcelApi from Java to C  and using it   But if this is a commercial application  you would be better off by purchasing a third party library  like Aspose Cells  Believe me  it totally worths it as it saves a lot of time and time ain t free

User · Answer

For opening a file  try this   objexcel Workbooks Open   C  YourPath YourExcelFile xls       missing  missing  missing  missing  missing  missing  missing      missing  missing  missing  missing  missing missing  missing     You must supply those stupid looking  missing  arguments  If you were writing the same code in VB Net you wouldn t have needed them  but you can t avoid them in C

User · Answer

FileInfo fi   new FileInfo  C   test  report xlsx    if fi Exists        System Diagnostics Process Start   C  test report xlsx      else         file doesn t exist

User · Answer

You need to have installed Microsoft Visual Studio Tools for Office  VSTO    VSTO can be selected in the Visual Studio installer under Workloads   Web  amp  Cloud   Office SharePoint Development   After that create common  NET project and add the reference to  Microsoft Office Interop Excel via  Add Reference      Assemblies  dialog   Application excel   new Application    Workbook wb   excel Workbooks Open path     Missing Value is a special reflection struct for unnecessary parameters replacement    In newer versions  the assembly reference required is called Microsoft Excel 16 0 Object Library  If you do not have the latest version installed you might have Microsoft Excel 15 0 Object Library  or an older version  but it is the same process to include

User · Answer

It s easier to help you if you say what s wrong as well  or what fails when you run it   But from a quick glance you ve confused a few things   The following doesn t work because of a couple of issues   if  Directory  C   csharp  error report1 xls           What you are trying to do is creating a new Directory object that should point to a file and then check if there was any errors    What you are actually doing is trying to call a function named Directory   and then assign a string to the result  This won t work since 1  you don t have a function named Directory string str  and you cannot assign to the result from a function  you can only assign a value to a variable    What you should do  for this line at least  is the following  FileInfo fi   new FileInfo  C   csharp  error report1 xls    if  fi Exists           Create the xl file here   else          Open file here     As to why the Excel code doesn t work  you have to check the documentation for the Excel library which google should be able to provide for you

User · Answer

Is this a commercial application or some hobbyist   open source software   I m asking this because in my experience  all free  NET Excel handling alternatives have serious problems  for different reasons  For hobbyist things  I usually end up porting jExcelApi from Java to C  and using it   But if this is a commercial application  you would be better off by purchasing a third party library  like Aspose Cells  Believe me  it totally worths it as it saves a lot of time and time ain t free

User · Answer

It s easier to help you if you say what s wrong as well  or what fails when you run it   But from a quick glance you ve confused a few things   The following doesn t work because of a couple of issues   if  Directory  C   csharp  error report1 xls           What you are trying to do is creating a new Directory object that should point to a file and then check if there was any errors    What you are actually doing is trying to call a function named Directory   and then assign a string to the result  This won t work since 1  you don t have a function named Directory string str  and you cannot assign to the result from a function  you can only assign a value to a variable    What you should do  for this line at least  is the following  FileInfo fi   new FileInfo  C   csharp  error report1 xls    if  fi Exists           Create the xl file here   else          Open file here     As to why the Excel code doesn t work  you have to check the documentation for the Excel library which google should be able to provide for you

User · Answer

Microsoft Office Interop Excel Application excapp   excapp   new Microsoft Office Interop Excel Application     object misval System Reflection Missing Value   Workbook wrkbuk   new Workbook     Worksheet wrksht   new Worksheet     wrkbuk   excapp Workbooks  Open   C  Users         template v1 0 xlsx   misval  misval   misval  misval  misval  misval  misval  misval  misval  misval  misval  misval    wrksht    Microsoft Office Interop Excel Worksheet wrkbuk Worksheets get Item 2

User · Answer

Imports   using Excel  Microsoft Office Interop Excel   using Microsoft VisualStudio Tools Applications Runtime    Here is the code to open an excel sheet using C        Microsoft Office Interop Excel Application excel   new Microsoft Office Interop Excel Application        Microsoft Office Interop Excel Workbook wbv   excel Workbooks Open  C   YourExcelSheet xlsx        Microsoft Office Interop Excel Worksheet wx   excel ActiveSheet as Microsoft Office Interop Excel Worksheet       wbv Close true  Type Missing  Type Missing       excel Quit      Here is a video mate on how to open an excel worksheet using C  https   www youtube com watch v O5Dnv0tfGv4

User · Answer

FileInfo fi   new FileInfo  C   test  report xlsx    if fi Exists        System Diagnostics Process Start   C  test report xlsx      else         file doesn t exist

User · Answer

It s easier to help you if you say what s wrong as well  or what fails when you run it   But from a quick glance you ve confused a few things   The following doesn t work because of a couple of issues   if  Directory  C   csharp  error report1 xls           What you are trying to do is creating a new Directory object that should point to a file and then check if there was any errors    What you are actually doing is trying to call a function named Directory   and then assign a string to the result  This won t work since 1  you don t have a function named Directory string str  and you cannot assign to the result from a function  you can only assign a value to a variable    What you should do  for this line at least  is the following  FileInfo fi   new FileInfo  C   csharp  error report1 xls    if  fi Exists           Create the xl file here   else          Open file here     As to why the Excel code doesn t work  you have to check the documentation for the Excel library which google should be able to provide for you

[c#] How to open an Excel file in C#?

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