Question

请问C#如何在listview中点击获取表头的值

Answer 1

共有三种方法可以实现

1、以编程方式进行排序

具体为使用 SortOrder 和 SortedColumn 属性确定排序的方向，并使用 SortGlyphDirection 属性手动设置排序的标志符号。Sort 方法的 Sort(DataGridViewColumn,ListSortDirection) 重载仅用于在单列中对数据进行排序。

using System;

using System.ComponentModel;

using System.Windows.Forms;

class Form1 : Form

{

private Button sortButton = new Button();

private DataGridView dataGridView1 = new DataGridView();

// Initializes the form.

// You can replace this code with designer-generated code.

public Form1()

{

dataGridView1.Dock = DockStyle.Fill;

dataGridView1.AllowUserToAddRows = false;

dataGridView1.SelectionMode =

DataGridViewSelectionMode.ColumnHeaderSelect;

dataGridView1.MultiSelect = false;

sortButton.Dock = DockStyle.Bottom;

sortButton.Text = "Sort";

Controls.Add(dataGridView1);

Controls.Add(sortButton);

Text = "DataGridView programmatic sort demo";

}

// Establishes the main entry point for the application.

[STAThreadAttribute()]

static void Main()

{

Application.EnableVisualStyles();

Application.Run(new Form1());

}

// Populates the DataGridView.

// Replace this with your own code to populate the DataGridView.

public void PopulateDataGridView()

{

// Add columns to the DataGridView.

dataGridView1.ColumnCount = 2;

dataGridView1.Columns[0].HeaderText = "Last Name";

dataGridView1.Columns[1].HeaderText = "City";

// Populate the DataGridView.

dataGridView1.Rows.Add(new string[] );

dataGridView1.Rows.Add(new string[] );

dataGridView1.Rows.Add(new string[] );

dataGridView1.Rows.Add(new string[] );

dataGridView1.Rows.Add(new string[] );

}

protected override void OnLoad(EventArgs e)

{

sortButton.Click += new EventHandler(sortButton_Click);

PopulateDataGridView();

base.OnLoad(e);

}

private void sortButton_Click(object sender, System.EventArgs e)

{

// Check which column is selected, otherwise set NewColumn to null.

DataGridViewColumn newColumn =

dataGridView1.Columns.GetColumnCount(

DataGridViewElementStates.Selected) == 1 ?

dataGridView1.SelectedColumns[0] : null;

DataGridViewColumn oldColumn = dataGridView1.SortedColumn;

ListSortDirection direction;

// If oldColumn is null, then the DataGridView is not currently sorted.

if (oldColumn != null)

{

// Sort the same column again, reversing the SortOrder.

if (oldColumn == newColumn &&

dataGridView1.SortOrder == SortOrder.Ascending)

{

direction = ListSortDirection.Descending;

}

else

{

// Sort a new column and remove the old SortGlyph.

direction = ListSortDirection.Ascending;

oldColumn.HeaderCell.SortGlyphDirection = SortOrder.None;

}

}

else

{

direction = ListSortDirection.Ascending;

}

// If no column has been selected, display an error dialog box.

if (newColumn == null)

{

MessageBox.Show("Select a single column and try again.",

"Error: Invalid Selection", MessageBoxButtons.OK,

MessageBoxIcon.Error);

}

else

{

dataGridView1.Sort(newColumn, direction);

newColumn.HeaderCell.SortGlyphDirection =

direction == ListSortDirection.Ascending ?

SortOrder.Ascending : SortOrder.Descending;

}

}

}

3、使用 IComparer 接口自定义排序

使用 Sort 方法的 Sort(IComparer) 重载自定义排序，该重载采用 IComparer 接口的实现来执行多列排序。

#region Using directives

using System;

using System.Drawing;

using System.Windows.Forms;

#endregion

class Form1 : Form

{

private DataGridView DataGridView1 = new DataGridView();

private FlowLayoutPanel FlowLayoutPanel1 = new FlowLayoutPanel();

private Button Button1 = new Button();

private RadioButton RadioButton1 = new RadioButton();

private RadioButton RadioButton2 = new RadioButton();

// Establish the main entry point for the application.

[STAThreadAttribute()]

public static void Main()

{

Application.Run(new Form1());

}

public Form1()

{

// Initialize the form.

// This code can be replaced with designer generated code.

AutoSize = true;

Text = "DataGridView IComparer sort demo";

FlowLayoutPanel1.FlowDirection = FlowDirection.TopDown;

FlowLayoutPanel1.Location = new System.Drawing.Point( 304, 0 );

FlowLayoutPanel1.AutoSize = true;

FlowLayoutPanel1.Controls.Add( RadioButton1 );

FlowLayoutPanel1.Controls.Add( RadioButton2 );

FlowLayoutPanel1.Controls.Add( Button1 );

Button1.Text = "Sort";

RadioButton1.Text = "Ascending";

RadioButton2.Text = "Descending";

RadioButton1.Checked = true;

Controls.Add( FlowLayoutPanel1 );

Controls.Add( DataGridView1 );

}

protected override void OnLoad( EventArgs e )

{

PopulateDataGridView();

Button1.Click += new EventHandler(Button1_Click);

base.OnLoad( e );

}

// Replace this with your own code to populate the DataGridView.

private void PopulateDataGridView()

{

DataGridView1.Size = new Size(300, 300);

// Add columns to the DataGridView.

DataGridView1.ColumnCount = 2;

// Set the properties of the DataGridView columns.

DataGridView1.Columns[0].Name = "First";

DataGridView1.Columns[1].Name = "Last";

DataGridView1.Columns["First"].HeaderText = "First Name";

DataGridView1.Columns["Last"].HeaderText = "Last Name";

DataGridView1.Columns["First"].SortMode =

DataGridViewColumnSortMode.Programmatic;

DataGridView1.Columns["Last"].SortMode =

DataGridViewColumnSortMode.Programmatic;

// Add rows of data to the DataGridView.

DataGridView1.Rows.Add(new string[] );

DataGridView1.Rows.Add(new string[] );

DataGridView1.Rows.Add(new string[] );

DataGridView1.Rows.Add(new string[] );

DataGridView1.Rows.Add(new string[] );

}

private void Button1_Click( object sender, EventArgs e )

{

if ( RadioButton1.Checked == true )

{

DataGridView1.Sort( new RowComparer( SortOrder.Ascending ) );

}

else if ( RadioButton2.Checked == true )

{

DataGridView1.Sort( new RowComparer( SortOrder.Descending ) );

}

}

private class RowComparer : System.Collections.IComparer

{

private static int sortOrderModifier = 1;

public RowComparer(SortOrder sortOrder)

{

if (sortOrder == SortOrder.Descending)

{

sortOrderModifier = -1;

}

else if (sortOrder == SortOrder.Ascending)

{

sortOrderModifier = 1;

}

}

public int Compare(object x, object y)

{

DataGridViewRow DataGridViewRow1 = (DataGridViewRow)x;

DataGridViewRow DataGridViewRow2 = (DataGridViewRow)y;

// Try to sort based on the Last Name column.

int CompareResult = System.String.Compare(

DataGridViewRow1.Cells[1].Value.ToString(),

DataGridViewRow2.Cells[1].Value.ToString());

// If the Last Names are equal, sort based on the First Name.

if ( CompareResult == 0 )

{

CompareResult = System.String.Compare(

DataGridViewRow1.Cells[0].Value.ToString(),

DataGridViewRow2.Cells[0].Value.ToString());

}

return CompareResult * sortOrderModifier;

}

}

}

Answer 2

如果是一整行的数据，假设现在一行有4个数据吧。
如果要遍历的话用foreach来实现
int i=0;
StreamWriter SW=new StreamWriter(@"D:\test.txt",true);
foreach(ListViewItem LVI in this.ListView1.Items )
{
SW.Write(LVI.SubItem[0].text+"|");
SW.Write(LVI.SubItem[1].text+"|");
SW.Write(LVI.SubItem[2].text+"|");
SW.WriteLine(LVI.SubItem[3].text);

}
SW.Close();

上面是简单的实现将LivsView中的数据写入一个test.txt的文本文档中，每一行ListView的数据用 | 隔开，每写完一行后，转入下一行进行写数据，知道遍历完整个ListView的数据，此外当一行的数据很多的时候，也可以用SubItems.Counts来得到它的个数，并用循环分别读取，由于为了演示的方便，就直接列出了4个

Answer 3

2.用法：
# 排除当前虚拟主机需要正常访问的域名（web.eboat.cn ）
# RewriteCond Host: (?:web|www)\.eboat\.cn
# 多数情况下是一个，即当前提供二级域名服务的系统（如建站系统）
RewriteCond Host: web\.eboat\.cn
RewriteRule (.*) $1 [L]
# 解决不规范目录（末尾无/）的问题
# 但前提是目录名不含‘.’而文件名必须包含，否则无法区分两者
# 如果保证URL中的目录名称规范，则无需此规则
RewriteRule ^/([^.]+[^/]$) /$1/ [L,R]
# 提取任意的二级域名名称（即第一个词汇）
# 用[a-zA-Z0-9_-]限制名称字符，重写Url到Home/子目录下
# 如 test.eboat.cn => web.eboat.cn/Home/test
RewriteCond Host: ([a-zA-Z0-9_-]+)\.eboat\.cn
RewriteRule ^/(.*) /Home/$1/$2 [I,L]
[ISAPI_Rewrite]
RepeatLimit 1