将.mpp文件添加到列表<>

Question

我正在使用.mpp文件...我要做的第一件事是读取扩展名为.mpp的文件，这对我来说很好，现在我想做的就是将该文件添加到列表中，但是我无法获取。

我是这个新事物

private void Btn_Actualizar_Click(object sender, EventArgs e)
    {
        OpenFileDialog theDialog = new OpenFileDialog();
        if (theDialog.ShowDialog() == DialogResult.OK)
        {
            string fileName = theDialog.FileName.ToString();
            Load(fileName);
        }
    }

    public new string Load(string fileName)
    {
        MSProject.ApplicationClass app = null;
        string retVal = "";
        List<Task> tasks = new List<Task>();

        try
        {
            // execute the Microsoft Project Application
            app = new MSProject.ApplicationClass();

            // Do not display Microsoft Project
            app.Visible = false;

            // open the project file.
            if (app.FileOpen(fileName, true, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, MSProject.PjPoolOpen.pjPoolReadOnly, Type.Missing, Type.Missing, Type.Missing, Type.Missing))
            {
                // go through all the open projects--there should only be one
                foreach (MSProject.Project proj in app.Projects)
                {
                    // go through all the tasks in the project
                    foreach (MSProject.Task task in proj.Tasks)
                    {
                        // add Microsoft Project Task to arraylist                          
                        //tasks.Add(new Task(task));
                        //tasks.Add(task);
                        List<Task> tasks1 = new List<Task>();

                    }
                }
            }
            else
            {
                retVal = "The MS Project file " + fileName + " could not be opened.";
            }
        }

        catch (Exception ex)
        {
            retVal = "Could not process the MS Project file " + fileName + "." + System.Environment.NewLine + ex.Message + System.Environment.NewLine + ex.StackTrace;
        }

        // close the application if is was opened.
        if (app != null)
        {
            app.Quit(MSProject.PjSaveType.pjDoNotSave);
        }
        return retVal;
    }

我要在其中添加读取文件结果的位置在我的代码的此部分中

foreach (MSProject.Task task in proj.Tasks)
                    {
                        // add Microsoft Project Task to arraylist                          
                        //tasks.Add(new Task(task));
                        //tasks.Add(task);
                        List<Task> tasks1 = new List<Task>();

                    }

搜索网络已经尝试了几种方法，但到目前为止，它对我来说不起作用，列表始终为0

Answer 1

你是如此亲密。不幸的是，在循环中，您一直在重新创建任务列表，而不是一次创建并将每个Task添加到现有List中。

//First, declare your task list outside of any of your event handlers
List<MSProject.Task> tasks = new List<MSProject.Task>();

private void Btn_Actualizar_Click(object sender, EventArgs e)
{
    OpenFileDialog theDialog = new OpenFileDialog();
    // ... and the rest of that code

在Load()函数中，像这样更改代码，请尝试以下方法：

public new string Load(string fileName)
{
    MSProject.ApplicationClass app = null;
    string retVal = "";
    //if the list object hasn't been created yet, then create it now
    if (tasks == null) 
        tasks = new List<MSProject.Task>();
    else //if it was already created, just clear it.
        tasks.Clear();

    try
    {
        //... (I didn't paste all of the code. It is still required, of course.)

            // go through all the open projects--there should only be one
            foreach (MSProject.Project proj in app.Projects)
            {
                // go through all the tasks in the project
                foreach (MSProject.Task task in proj.Tasks)
                {
                    // add Microsoft Project Task to arraylist                          
                    tasks.Add(task); //<-- this was the correct line, uncommented
                }
        //... (I didn't paste all of the code. It is still required, of course.)

@@ Michael Jones也有很好的建议。一些库重新使用了名称Task。最好包含名称空间MSProject，以避免任何歧义和相关错误。

Answer 2

根据我的评论，更改声明列表的方式，然后取消对添加内容的注释。现在，您只需要弄清楚列表的实际用途。

private void Btn_Actualizar_Click(object sender, EventArgs e)
    {
        OpenFileDialog theDialog = new OpenFileDialog();
        if (theDialog.ShowDialog() == DialogResult.OK)
        {
            string fileName = theDialog.FileName.ToString();
            Load(fileName);
        }
    }

    public new string Load(string fileName)
    {
        MSProject.ApplicationClass app = null;
        string retVal = "";
        List<MSProject.Task> tasks = new List<MSProject.Task>();

        try
        {
            // execute the Microsoft Project Application
            app = new MSProject.ApplicationClass();

            // Do not display Microsoft Project
            app.Visible = false;

            // open the project file.
            if (app.FileOpen(fileName, true, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, MSProject.PjPoolOpen.pjPoolReadOnly, Type.Missing, Type.Missing, Type.Missing, Type.Missing))
            {
                // go through all the open projects--there should only be one
                foreach (MSProject.Project proj in app.Projects)
                {
                    // go through all the tasks in the project
                    foreach (MSProject.Task task in proj.Tasks)
                    {
                        // add Microsoft Project Task to arraylist                          
                        //tasks.Add(new Task(task));
                        tasks.Add(task);
                        //List<Task> tasks1 = new List<Task>();

                    }
                }
            }
            else
            {
                retVal = "The MS Project file " + fileName + " could not be opened.";
            }
        }

        catch (Exception ex)
        {
            retVal = "Could not process the MS Project file " + fileName + "." + System.Environment.NewLine + ex.Message + System.Environment.NewLine + ex.StackTrace;
        }

        // close the application if is was opened.
        if (app != null)
        {
            app.Quit(MSProject.PjSaveType.pjDoNotSave);
        }
        return retVal;
    }