c# - 如何在 C# 中显示和排序列表？

Question

我有一个“StudentRecords”列表，其中包含学生及其考试成绩。对于每个学生，我都有他们的姓名、年龄、联系电话、考试成绩和他们参加考试的日期。

public class StudentRecord
{
       public String Name  { get; set; }
       public int Age  { get; set; }
       public String PhoneNum  { get; set; }
       public int TestScore1  { get; set; }
       public DateTime TestScore1Date  { get; set; }
}

List<StudentRecord> StudentList = new List<StudentRecord>();
dataGridView1.DataSource = StudentList;

我将我的列表绑定(bind)到 DataGridView 控件，并且能够很好地查看信息。现在，我希望能够在 DataGrid 控件中先按名称对列表的内容进行排序，然后是分数，然后是年龄。

我发现了这个: http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.columnheadermouseclick.aspx

表示默认行为是根据单击的列标题对网格行进行排序。但是，当我单击时，默认情况下不会发生这种情况。事实上，当我点击列标题时没有任何反应。知道我可能做错了什么吗？

Answer 1

不幸的是，此行为在 DataGridView 中不可用控制。为了使用List<T>作为绑定(bind)源并允许列点击排序，那么你需要处理 ColumnHeaderMouseClick DataGridView 事件，像这样:

protected void dataGridView1_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
    // Get the information about the column clicked
    var strColumnName = dataGridView1.Columns[e.ColumnIndex].Name;
    SortOrder strSortOrder = getSortOrder(e.ColumnIndex);

    // Sort the list
    StudentList.Sort(new StudentComparer(strColumnName, strSortOrder));

    // Rebind to use sorted list
    dataGridView1.DataSource = null;
    dataGridView1.DataSource = StudentList;

    // Update user interface icon for sort order in column clicked
    dataGridView1.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection = strSortOrder;
}

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;
    }
}

public class StudentComparer : IComparer<StudentRecord>
{
    string memberName = String.Empty;
    SortOrder sortOrder = SortOrder.None;

    public StudentComparer(string strMemberName, SortOrder sortingOrder)
    {
        memberName = strMemberName;
        sortOrder = sortingOrder;
    }

    public int Compare(StudentRecord student1, StudentRecord 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 "Age":
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = student1.Age.CompareTo(student2.Age);
                }
                else
                {
                    returnValue = student2.Age.CompareTo(student1.Age);
                }
                break;
            case "PhoneNum":
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = student1.PhoneNum.CompareTo(student2.PhoneNum);
                }
                else
                {
                    returnValue = student2.PhoneNum.CompareTo(student1.PhoneNum);
                }
                break;
            case "TestScore1":
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = student1.TestScore1.CompareTo(student2.TestScore1);
                }
                else
                {
                    returnValue = student2.TestScore1.CompareTo(student1.TestScore1);
                }
                break;
            case "TestScore1Date":
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = student1.TestScore1Date.CompareTo(student2.TestScore1Date;
                }
                else
                {
                    returnValue = student2.TestScore1Date.CompareTo(student1.TestScore1Date);
                }
                break;
            default:
                if (sortOrder == SortOrder.Ascending)
                {
                    returnValue = Student1.Name.CompareTo(Student2.Name);
                }
                else
                {
                    returnValue = Student2.Name.CompareTo(Student1.Name);
                }
                break;
        }
        return returnValue;
    }
}

注意:默认排序标准是Name .