Question

我在c＃中排序listview时遇到问题，我使用MSDN中的代码： https://msdn.microsoft.com/en-us/library/ms996467.aspx。问题是，如果您有一个2位数的数字，它不能正确排序值？

请帮忙吗？

编辑：

public class ListViewItemComparer : IComparer
     {
         private int col;
         private SortOrder order;
         public ListViewItemComparer()
         {
             col = 0;
             order = SortOrder.Ascending;
         }
         public ListViewItemComparer(int column, SortOrder order)
         {
             col = column;
             this.order = order;
         }
         public int Compare(object x, object y)
         {
             int returnVal = -1;
             returnVal = String.Compare(((ListViewItem)x).SubItems[col].Text,
                                     ((ListViewItem)y).SubItems[col].Text);
             // Determine whether the sort order is descending.
             if (order == SortOrder.Descending)
                 // Invert the value returned by String.Compare.
                 returnVal *= -1;
             return returnVal;
         }
     }

和：

private int sortColumn = -1;
        private void listView1_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            // Determine whether the column is the same as the last column clicked.
            if (e.Column != sortColumn)
            {
                // Set the sort column to the new column.
                sortColumn = e.Column;
                // Set the sort order to ascending by default.
                listView1.Sorting = SortOrder.Ascending;
            }
            else
            {
                // Determine what the last sort order was and change it.
                if (listView1.Sorting == SortOrder.Ascending)
                    listView1.Sorting = SortOrder.Descending;
                else
                    listView1.Sorting = SortOrder.Ascending;
            }

            // Call the sort method to manually sort.
            listView1.Sort();
            // Set the ListViewItemSorter property to a new ListViewItemComparer
            // object.
           this.listView1.ListViewItemSorter = new ListViewItemComparer(e.Column,
                                                            listView1.Sorting);
        }

Answer 1

在MSDN上链接的示例中，这是代码：

public int Compare(object x, object y) 
{
    int returnVal = -1;
    returnVal = String.Compare(((ListViewItem)x).SubItems[col].Text,
    ((ListViewItem)y).SubItems[col].Text);
    return returnVal;
}

即进行string比较，以便将您的列排序为string。如果类型为int或其他数字类型，则需要修改代码以使用数字对其进行排序。这是一些代码：

public int Compare(object x, object y)
{
int returnVal = -1;
    try
    {
        // Parse the two objects passed as a parameter as a DateTime.
        int num1 =
            int.Parse(((ListViewItem)x).SubItems[col].Text);
        int num2 =
                int.Parse(((ListViewItem)y).SubItems[col].Text);
        // Compare the two numbers.
        returnVal = num1.CompareTo(num2);
    }
    // If neither compared object has a valid int, compare
    // as a string.
    catch
    {
        // Compare the two items as a string.
        returnVal = String.Compare(((ListViewItem)x).SubItems[col].Text,
                    ((ListViewItem)y).SubItems[col].Text);
    }
  // Determine whether the sort order is descending.
            if (order == SortOrder.Descending)
                 // Invert the value returned by String.Compare.
                 returnVal *= -1;
             return returnVal;

}

排序listview无法使用2位数c＃

1 个答案: