Editing/Writing mpp file on c# using mpxj

huangapple
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英文:

Editing/Writing mpp file on c# using mpxj

问题

I'm trying to view and edit Tasks on a mpp file using mpxj on c#. I wrote some lines and tring to write a file that is already complete adding a new Task.

But when the code arrives to the write part, it create the file in the path I meant but the file is empty and if I try to read that file it give me the System.NullReferenceException : Object reference not set to an instance of an object error. It's the first time code with this mpxj library.

  1. ProjectReader reader = new MPPReader();
  2. ProjectWriter writer = new MPXWriter();
  3. private ProjectFile project;
  5. public ProjectFile OpenReaderProject()
  6. {
  7.     string filePath = "Files/Prova file1.mpp";
  9.     try
  10.     {
  11.         project = reader.read(filePath);
  12.     }
  13.     catch (MPXJException ex)
  14.     {
  15.         Console.WriteLine("Errore durante l'apertura del file .mpp: " + ex.Message);
  16.     }
  17.     return project;
  18. }
  20. public ProjectFile OpenWriterProject()
  21. {
  22.     string filePath = "Files/Prova file1.mpp";
  24.     try
  25.     {
  26.         writer.write(project, filePath);
  27.     }
  28.     catch (MPXJException ex)
  29.     {
  30.         Console.WriteLine("Errore durante la scrittura del file .mpp: " + ex.Message);
  31.     }
  32.     return project;
  33. }

This is the write and reading part.

  1. public void AddTask()
  2. {
  3.     var project = OpenReaderProject();
  5.     var task = project.addTask();
  6.     task.setName(java.lang.String.valueOf("Attività di esempio"));
  7.     var taskDto = _mapper.Map<TaskDto>(task);
  8.     OpenWriterProject();
  9. }

This is the add task function and calling the OpenWriterProject.
What's wrong with it? Feel free to answer me Editing/Writing mpp file on c# using mpxj Thanks

英文:

I'm trying to view and edit Tasks on a mpp file using mpxj on c#. I wrote some lines and tring to write a file that is already complete adding a new Task.

But when the code arrives to the write part, it create the file in the path I meant but the file is empty and if I try to read that file it give me the System.NullReferenceException : Object reference not set to an instance of an object error. It's the first time code with this mpxj library.

  1.  ProjectReader reader = new MPPReader();
  2.  ProjectWriter writer = new MPXWriter();
  3.  private ProjectFile project;
  5.  public ProjectFile OpenReaderProject()
  6.     {
  7.         string filePath = &quot;Files/Prova file1.mpp&quot;;
  9.         try
  10.         {
  11.             project = reader.read(filePath);
  12.         }
  13.         catch (MPXJException ex)
  14.         {
  15.             Console.WriteLine(&quot;Errore durante l&#39;apertura del file .mpp: &quot; + ex.Message);
  16.         }
  17.         return project;
  18.     }
  20.     public ProjectFile OpenWriterProject()
  21.     {
  22.         string filePath = &quot;Files/Prova file1.mpp&quot;;
  24.         try
  25.             {
  26.             writer.write(project, filePath);
  27.             }
  28.             catch (MPXJException ex)
  29.             {
  30.                 Console.WriteLine(&quot;Errore durante la scrittura del file .mpp: &quot; + ex.Message);
  31.             }
  32.         return project;
  33.     }

This is the write and reading part.

  1.  public void AddTask()
  2.     {
  3.         var project = OpenReaderProject();
  5.         var task = project.addTask();
  6.         task.setName(java.lang.String.valueOf(&quot;Attivit&#224; di esempio&quot;));
  7.         var taskDto = _mapper.Map&lt;TaskDto&gt;(task);
  8.             OpenWriterProject();
  10.     }`

This is the add task function and calling the OpenWriterProject.
What's wrong with it? Feel free to answer me Editing/Writing mpp file on c# using mpxj Thanks

答案1

得分: 1

你需要在使用写入器之前关闭阅读器。我建议你在使用它们之前仅创建 reader 和 writer 对象，像这样：

  1. ProjectFile project;
  2. string filePath = "Files/Prova file1.mpp";
  4. public ProjectFile OpenReaderProject()
  5. {
  6.     ProjectReader reader = new MPPReader();
  7.     project = reader.read(filePath);
  8.     return project;
  9. }
  11. public ProjectFile OpenWriterProject()
  12. {
  13.     ProjectWriter writer = new MPXWriter();
  14.     writer.write(project, filePath);
  15.     return project;
  16. }
英文:

You will have to close the reader before using the writer. I suggest that you only create the reader and writer objects just before you use them, like this:

  1. ProjectFile project;
  2. string filePath = &quot;Files/Prova file1.mpp&quot;;
  4. public ProjectFile OpenReaderProject()
  5. {
  6.     ProjectReader reader = new MPPReader();
  7.     project = reader.read(filePath);
  8.     return project;
  9. }
  11. public ProjectFile OpenWriterProject()
  12. {
  13.     ProjectWriter writer = new MPXWriter();
  14.     writer.write(project, filePath);
  15.     return project;
  16. }

huangapple
  • 本文由 发表于 2023年7月3日 21:52:16
  • 转载请务必保留本文链接：https://go.coder-hub.com/76605409.html
  • c#
  • mpxj
  • task
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