Question

我一直致力于在数据网格视图中显示某些特定元素的表单。一切都已实施，并正常运作;然后我决定改变一切。我需要这个特定形式的许多不同版本，所以我创建了一个基本形式，我的其他形式可以从中派生出来。当我实现此基本表单的继承时，数据反向列出。换句话说，在我进行更改之前列出了列（问题编号，标记为已审查，已回答）但是，无论出于什么原因列出了数据（已回答，标记为要审核，问题编号）。这很重要的原因是我的代码假定问题编号是第一行，并且该信息用于查找并显示该特定问题。

基本形式如下所示

public partial class DataFormBase : FormBase
{
    /// <summary>
    /// Initializes a new instance of the <see cref="DataFormBase"/> class.
    /// </summary>
    public DataFormBase()
    {
        InitializeComponent();

        DrawGUI();
    }

    protected virtual void PopulateDataGrid() {}

    protected virtual void dgvData_CellClick(object sender, DataGridViewCellEventArgs e){}

    private void dgvData_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
    {
        dgvData.ClearSelection();
    }
}

实现看起来像这样

public partial class SessionReviewForm : Core.DataFormBase
{
    public QuestionSessionForm ParentSession 
    {
        get; set;
    }

    public Session Session
    {
        get; set;
    }

    public SessionPart SessionPart
    {
        get; set;
    }

    /// <summary>
    /// Shows the dialog form.
    /// </summary>
    /// <param name="session">The session.</param>
    /// <param name="sessionPart">The session part.</param>
    /// <param name="parent">The parent.</param>
    /// <returns></returns>
    public static DialogResult ShowDialogForm(Session session, SessionPart sessionPart, QuestionSessionForm parent)
    {
        // if any of the params are null get the hell out!
        if (session == null || sessionPart == null || parent == null)
            return DialogResult.None;

        // create the new form, and populate its params
        SessionReviewForm form = new SessionReviewForm()
        {
            Session = session,
            SessionPart = sessionPart,
            ParentSession = parent,
        };

        // populate the forms data grid
        form.PopulateDataGrid();

        form.Size = new System.Drawing.Size(400,400);

        // show the form
        return form.ShowDialog(parent);
    }

    /// <summary>
    /// Populates the data grid with the required information
    /// </summary>
    /// <param name="instance">The instance for the w</param>
    protected override void PopulateDataGrid()
    {
        // Get all of the questions that are marked for review
        SessionQuestions questionsToDisplay = SessionPart.SessionQuestions.GetMarkedForReview();

        // add to the list all of the questions that have not yet been answered
        questionsToDisplay.AddRange(SessionPart.SessionQuestions.GetNotAnswered());

        // create a list of objects for the data grid view
        List<SessionReviewData> objectList = new List<SessionReviewData>();

        // for each question in the session question list, populate a new member of
        // the object list
        foreach (SessionQuestion sq in questionsToDisplay)
        {
            SessionReviewData temp = new SessionReviewData
            {
                QuestionNumber = sq.Sequence + 1,
                MarkedForReview = sq.MarkForReview,
                IsAnswered = sq.IsAnswered
            };
            objectList.Add(temp);
        }

        // bind the data grid view to the object list
        dgvData.DataSource = objectList;

        // format the column headers so that they have a space between words
        for (int i = 0; i < dgvData.Columns.Count; i++)
        {
            dgvData.Columns[i].HeaderText = Utilities.AddSpacesToSentence(dgvData.Columns[i].Name);
        }
    }

    /// <summary>
    /// Handles the CellClick event of the dgvQuestions control.
    /// populates the parent form with the selected question
    /// then closes the form.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="System.Windows.Forms.DataGridViewCellEventArgs"/> instance containing the event data.</param>
    protected override void dgvData_CellClick(object sender, DataGridViewCellEventArgs e)
    {
        // if the user selects the header column, then get out.
        if (e.RowIndex == -1)
            return;

        // send the question data to the parentSession form to display the question
        ParentSession.DisplayQuestionByIndex((int)(dgvData.Rows[e.RowIndex].Cells[0].Value) - 1);

        // close this form
        Close();
    }

解决：事实证明，Narrange将我的内部数据结构按字母顺序排列，这导致它们以错误的顺序列出。

Answer 1

“假设”某些事情会在某处出现的代码可能会给您带来问题。

简单的解决方案是自己添加列，只要您始终希望按特定顺序使用相同的列;

dataGridView1.AutoGenerateColumns = false;
DataGridViewColumn column = new DataGridViewColumn();
        column.DataPropertyName = "Question Number";
        column.HeaderText = "Question Number";
dataGridView1.Columns.Add(column);

......等等你想要的每一栏

数据网格视图反转成员

1 个答案: