如何对包含文件大小数据的列表视图列进行排序？ C＃

我想对ListView列中的项进行排序，我已经完成了它，但是……我无法用列中的数据类型（见图）来制作它，有人知道这样做的方法吗？

Answer 1

为sort函数编写自定义比较器，如下所示：

/// 
 /// Comparator for values like 123 KB /// 
 /// First value to compare /// Second value to compare /// 0 for equal, 1 for x > y, -1 for x < y int Compare(object x, object y) { // Convert to strings string strX = null; if (x is string) strX = (string)x; else if (x != null) strX = x.ToString(); string strY = null; if (y is string) strY = (string)y; else if (y != null) strY = y.ToString(); // Nulls first (null means less, since it's blank) if (strX == null) { if (strY == null) return 0; return -1; } else if (strY == null) return 1; // Convert the non-KB part to a number double numX; double numY; if (strX.EndsWith("KB") || strX.EndsWith("GB") || strX.EndsWith("MB")) strX = strX.Substring(0, strX.Length - 2); if (strX.EndsWith("Bytes")) strX = strX.Substring(0, strX.Length - 5); strX = strX.Trim(); double.TryParse(strX, out numX); if (strY.EndsWith("KB") || strY.EndsWith("GB") || strY.EndsWith("MB")) strY = strY.Substring(0, strY.Length - 2); if (strY.EndsWith("Bytes")) strY = strX.Substring(0, strY.Length - 5); strY = strY.Trim(); double.TryParse(strY, out numY); // Compare the numbers return numX.CompareTo(numY); } 

Answer 2

您是否尝试过Microsoft为此任务所说的话 ？ 基本上，您必须实现自定义比较器，并处理ColumnClick事件。 但是由于listview中的项目存储为字符串，因此您很可能需要进行一些解析（假设您要按大小排序），或者实现解决方法 – 排序数据源并重新设置项目（这可能更容易）。

用于解决方法的伪代码的快速示例（因为实现具有从字符串解析的自定义比较器对于这样的简单任务而言似乎太麻烦）。 在ColumnClick事件处理程序中，您可以这样做：

 // I assume you got list of raw dll sizes somewhere dllSizes.Sort(); List dllSizesForDisplay = new List(); foreach (var dll in dllSizes) { dllSizes.Add(new ListViewItem(GetSize(dll.Bytes))); } // reasign items listView.Items.Clear(); listView.Items.AddRange(dllSizesForDisplay); 

Answer 3

创建listViewSizeSorter类，扩展Icomparer接口，如下所示。

 using System.Collections; using System.Windows.Forms; namespace MyNameSpace { /// 
 /// This class is an implementation of the 'IComparer' interface. /// 
 public class ListViewSizeSorter : IComparer { /// 
 /// Specifies the column to be sorted /// 
 private int _columnToSort; /// 
 /// Specifies the order in which to sort (ie 'Ascending'). /// 
 private SortOrder _orderOfSort; /// 
 /// Class constructor. Initializes various elements /// 
 public ListViewSizeSorter() { // Initialize the column to '0' SortColumn = 0; // Initialize the sort order to 'none' Order = SortOrder.None; } /// 
 /// This method is inherited from the IComparer interface. It compares the two objects passed using a case insensitive comparison. /// 
 /// First object to be compared /// Second object to be compared /// The result of the comparison. "0" if equal, negative if 'x' is less than 'y' and positive if 'x' is greater than 'y' public int Compare(object x, object y) { var listviewX = (ListViewItem)x; var listviewY = (ListViewItem)y; string strX = listviewX.SubItems[_columnToSort].Text; string strY = listviewY.SubItems[_columnToSort].Text; // Nulls first (null means less, since it's blank) if (strX == null) { if (strY == null) return 0; return -1; } if (strY == null) return 1; // Convert the non-KB part to a number double numX = 0; double numY = 0; if (strX.EndsWith("KB") || strX.EndsWith("GB") || strX.EndsWith("MB")) double.TryParse(strX.Substring(0, strX.Length - 3), out numX); if (strX.EndsWith("Bytes")) double.TryParse(strX.Substring(0, strX.Length - 6), out numX); if (strY.EndsWith("KB") || strY.EndsWith("GB") || strY.EndsWith("MB")) double.TryParse(strY.Substring(0, strY.Length - 3), out numY); if (strY.EndsWith("Bytes")) double.TryParse(strX.Substring(0, strY.Length - 6), out numY); long bytesX; long bytesY; if (strX.EndsWith("KB")) bytesX = (long)numX * 1024; else if (strX.EndsWith("MB")) bytesX = (long)numX * 1048576; else if (strX.EndsWith("GB")) bytesX = (long)numX * 1073741824; else bytesX = (long) numX; if (strY.EndsWith("KB")) bytesY = (long)numY * 1024; else if (strY.EndsWith("MB")) bytesY = (long)numY * 1048576; else if (strY.EndsWith("GB")) bytesY = (long)numY * 1073741824; else bytesY = (long) numY; var compareResult = bytesX.CompareTo(bytesY); if (_orderOfSort == SortOrder.Ascending) { // Ascending sort is selected, return normal result of compare operation return compareResult; } if (_orderOfSort == SortOrder.Descending) { // Descending sort is selected, return negative result of compare operation return (-compareResult); } // Return '0' to indicate they are equal return 0; } /// 
 /// Gets or sets the number of the column to which to apply the sorting operation (Defaults to '0'). /// 
 public int SortColumn { set { _columnToSort = value; } get { return _columnToSort; } } /// 
 /// Gets or sets the order of sorting to apply (for example, 'Ascending' or 'Descending'). /// 
 public SortOrder Order { set { _orderOfSort = value; } get { return _orderOfSort; } } } } 

用您的名称更改命名空间名称。

在表单中添加以下行。

 private readonly ListViewSizeSorter _listViewSizeSorter; public Form1() { InitializeComponent(); _listViewSizeSorter = new ListViewSizeSorter {SortColumn = 1}; } private void ListViewFilesColumnClick(object sender, ColumnClickEventArgs e) { // Determine if clicked column is already the column that is being sorted. if (e.Column == _listViewColumnSorter.SortColumn) { if(e.Column.Equals(1)) { listViewFiles.ListViewItemSorter = _listViewSizeSorter; // Reverse the current sort direction for this column. _listViewSizeSorter.Order = _listViewSizeSorter.Order == SortOrder.Ascending ? SortOrder.Descending : SortOrder.Ascending; } } else { // Set the column number that is to be sorted; default to ascending. _listViewColumnSorter.SortColumn = e.Column; _listViewColumnSorter.Order = SortOrder.Ascending; } // Perform the sort with these new sort options. listViewFiles.Sort(); }