C#DataGridView使用Generic List作为基础源进行排序

Question

我正在使用Windows窗体DataGridView来显示MyObject对象的通用列表.

首先,我将此集合包装到BindingSourceCollection中,然后:

dataGridView.DataSource = myBindingSource;

我想要做的是允许用户通过单击表示MyObject中具体属性的列标题对列进行排序.

我读过一些文章,我应该在绑定之前进行排序.但是,如果我想实时对列进行排序,那么它就无法帮助我.

问题是,我到底需要做什么,所以我可以看到 DataGridView中的排序箭头,我可以对每一列进行排序？

Answer 1

完整代码,用于对datagridview列进行排序,其数据源是通用List

//-----------------------------------------------------------------------------------------
//In the form - In constructor or form load, populate the grid.
//--------------------------------------------------------------------------------------------

    List<student> students;

    private void PopulateList()
    {
        student std1 = new student("sss", 15, "Female");
        student std2 = new student("ddd", 12, "Male");
        student std3 = new student("zzz", 16, "Male");
        student std4 = new student("qqq", 14, "Female");
        student std5 = new student("aaa", 11, "Male");
        student std6 = new student("lll", 13, "Female");

        students = new List<student>();
        students.Add(std1);
        students.Add(std2);
        students.Add(std3);
        students.Add(std4);
        students.Add(std5);
        students.Add(std6);

        dataGridView1.DataSource = students;
    }


//---------------------------------------------------------------------------------------------
//Comparer class to perform sorting based on column name and sort order
//---------------------------------------------------------------------------------------------


class StudentComparer : IComparer<Student>
{
    string memberName = string.Empty; // specifies the member name to be sorted
    SortOrder sortOrder = SortOrder.None; // Specifies the SortOrder.

    /// <summary>
    /// constructor to set the sort column and sort order.
    /// </summary>
    /// <param name="strMemberName"></param>
    /// <param name="sortingOrder"></param>
    public StudentComparer(string strMemberName, SortOrder sortingOrder)
    {
        memberName = strMemberName;
        sortOrder = sortingOrder;
    }

    /// <summary>
    /// Compares two Students based on member name and sort order
    /// and return the result.
    /// </summary>
    /// <param name="Student1"></param>
    /// <param name="Student2"></param>
    /// <returns></returns>
    public int Compare(Student Student1, Student Student2)
    {
        int returnValue = 1;
        switch (memberName)
        {
            case "Name" :
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = Student1.Name.CompareTo(Student2.Name);
                }
                else
                {
                    returnValue = Student2.Name.CompareTo(Student1.Name);
                }

                break;
            case "Sex":
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = Student1.Sex.CompareTo(Student2.Sex);
                }
                else
                {
                    returnValue = Student2.Sex.CompareTo(Student1.Sex);
                }
                break;
            default:
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = Student1.Name.CompareTo(Student2.Name);
                }
                else
                {
                    returnValue = Student2.Name.CompareTo(Student1.StudentId);
                }
                break;
        }
        return returnValue;
    }
}



//---------------------------------------------------------------------------------------------
// Performing sort on click on Column Header
//---------------------------------------------------------------------------------------------

    private void dataGridView1_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
    {
        //get the current column details
        string strColumnName = dataGridView1.Columns[e.ColumnIndex].Name;
        SortOrder strSortOrder = getSortOrder(e.ColumnIndex);

        students.Sort(new StudentComparer(strColumnName, strSortOrder));
        dataGridView1.DataSource = null;
        dataGridView1.DataSource = students;
        customizeDataGridView();
        dataGridView1.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection = strSortOrder;
    }

   /// <summary>
    /// Get the current sort order of the column and return it
    /// set the new SortOrder to the columns.
    /// </summary>
    /// <param name="columnIndex"></param>
    /// <returns>SortOrder of the current column</returns>
    private SortOrder getSortOrder(int columnIndex)
    {
        if (dataGridView1.Columns[columnIndex].HeaderCell.SortGlyphDirection == SortOrder.None ||
            dataGridView1.Columns[columnIndex].HeaderCell.SortGlyphDirection == SortOrder.Descending)
        {
            dataGridView1.Columns[columnIndex].HeaderCell.SortGlyphDirection = SortOrder.Ascending;
            return SortOrder.Ascending;
        }
        else
        {
            dataGridView1.Columns[columnIndex].HeaderCell.SortGlyphDirection = SortOrder.Descending;
            return SortOrder.Descending;
        }
    }

Answer 2

我发现很难相信网格不提供开箱即用的基本排序,不需要代码.毕竟,必须处理标题点击事件并调用DataGridView.Sort指示列(由点击的内容,由网格跟踪确定)和排序方向(由当前排序状态确定,由网格跟踪)是非常愚蠢的).

为什么没有简单的SortMode或AllowUserToSort属性默认情况下执行完全相同的操作？

我已将网格绑定到List,并且我已将列映射到的属性都是基本类型,如string,int,DateTime等.所有这些都是IC Comparable.那么为什么我还需要写一行代码呢？特别是考虑到文档的内容如下:

默认情况下,用户可以通过单击文本框列的标题对DataGridView控件中的数据进行排序.

MSDN

这是Framework 3.0文档,我的目标是3.5,但"其他版本"都是指Visual Studio的版本,而不是Framework的版本.微软究竟发生了什么？!？

Answer 3

本文"呈现SortableBindingList"中的一个很好的解决方案:http://www.timvw.be/2007/02/22/presenting-the-sortablebindinglistt/

Answer 4

我的解决方案是这样的：

我自己使用 myBindingSource，在单独的线程中进行排序、分组等操作。然后我只需将结果绑定到 DataGridView。

myDataGridView.DataSource = bindingSource;

为此，我设置了所有要排序的列'Programatically'（在设计器中）然后我通过设置手动添加箭头（升序/降序）

cell.SortGlyphDirection = ... ; 

在后面的代码中。