C# 如何防止在更新单个ListViewItem时在ListView中闪烁';s文本?
我只想更新ListViewItem的文本,而不显示任何闪烁 这是我的更新代码(多次调用): 我见过一些涉及覆盖组件的C# 如何防止在更新单个ListViewItem时在ListView中闪烁';s文本?,c#,.net,winforms,listview,C#,.net,Winforms,Listview,我只想更新ListViewItem的文本,而不显示任何闪烁 这是我的更新代码(多次调用): 我见过一些涉及覆盖组件的WndProc(): 他们说它解决了问题,但就我而言,它没有解决问题。我相信这是因为我在每个项目上都使用图标。如果您只想更新文本,只需直接设置更改的子项目的文本,而不是更新整个ListViewItem(您没有说明如何进行更新) 您显示的覆盖相当于简单地覆盖OnPaintBackground,这将是执行该任务的“更正确”的托管方式,对单个项目没有帮助 如果您仍然有问题,我们需要澄清您
WndProc():
他们说它解决了问题,但就我而言,它没有解决问题。我相信这是因为我在每个项目上都使用图标。如果您只想更新文本,只需直接设置更改的子项目的文本,而不是更新整个ListViewItem(您没有说明如何进行更新) 您显示的覆盖相当于简单地覆盖OnPaintBackground,这将是执行该任务的“更正确”的托管方式,对单个项目没有帮助
如果您仍然有问题,我们需要澄清您实际尝试了什么。这是一个不确定的结果,但您可以尝试对控件进行双缓冲
SetStyle(
ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint |
ControlStyles.DoubleBuffer, true)
CommonControls 6(XP或更新版本)中的ListView支持双缓冲。幸运的是,.NET在系统上封装了最新的通用控件。要启用双缓冲,请向ListView控件发送适当的Windows消息 详情如下:
为了结束这个问题,在为表单中的每个ListView或任何其他ListView派生控件加载表单时,应该调用一个帮助器类。感谢“Brian Gillespie”给出了解决方案
public enum ListViewExtendedStyles
{
/// <summary>
/// LVS_EX_GRIDLINES
/// </summary>
GridLines = 0x00000001,
/// <summary>
/// LVS_EX_SUBITEMIMAGES
/// </summary>
SubItemImages = 0x00000002,
/// <summary>
/// LVS_EX_CHECKBOXES
/// </summary>
CheckBoxes = 0x00000004,
/// <summary>
/// LVS_EX_TRACKSELECT
/// </summary>
TrackSelect = 0x00000008,
/// <summary>
/// LVS_EX_HEADERDRAGDROP
/// </summary>
HeaderDragDrop = 0x00000010,
/// <summary>
/// LVS_EX_FULLROWSELECT
/// </summary>
FullRowSelect = 0x00000020,
/// <summary>
/// LVS_EX_ONECLICKACTIVATE
/// </summary>
OneClickActivate = 0x00000040,
/// <summary>
/// LVS_EX_TWOCLICKACTIVATE
/// </summary>
TwoClickActivate = 0x00000080,
/// <summary>
/// LVS_EX_FLATSB
/// </summary>
FlatsB = 0x00000100,
/// <summary>
/// LVS_EX_REGIONAL
/// </summary>
Regional = 0x00000200,
/// <summary>
/// LVS_EX_INFOTIP
/// </summary>
InfoTip = 0x00000400,
/// <summary>
/// LVS_EX_UNDERLINEHOT
/// </summary>
UnderlineHot = 0x00000800,
/// <summary>
/// LVS_EX_UNDERLINECOLD
/// </summary>
UnderlineCold = 0x00001000,
/// <summary>
/// LVS_EX_MULTIWORKAREAS
/// </summary>
MultilWorkAreas = 0x00002000,
/// <summary>
/// LVS_EX_LABELTIP
/// </summary>
LabelTip = 0x00004000,
/// <summary>
/// LVS_EX_BORDERSELECT
/// </summary>
BorderSelect = 0x00008000,
/// <summary>
/// LVS_EX_DOUBLEBUFFER
/// </summary>
DoubleBuffer = 0x00010000,
/// <summary>
/// LVS_EX_HIDELABELS
/// </summary>
HideLabels = 0x00020000,
/// <summary>
/// LVS_EX_SINGLEROW
/// </summary>
SingleRow = 0x00040000,
/// <summary>
/// LVS_EX_SNAPTOGRID
/// </summary>
SnapToGrid = 0x00080000,
/// <summary>
/// LVS_EX_SIMPLESELECT
/// </summary>
SimpleSelect = 0x00100000
}
public enum ListViewMessages
{
First = 0x1000,
SetExtendedStyle = (First + 54),
GetExtendedStyle = (First + 55),
}
/// <summary>
/// Contains helper methods to change extended styles on ListView, including enabling double buffering.
/// Based on Giovanni Montrone's article on <see cref="http://www.codeproject.com/KB/list/listviewxp.aspx"/>
/// </summary>
public class ListViewHelper
{
private ListViewHelper()
{
}
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int SendMessage(IntPtr handle, int messg, int wparam, int lparam);
public static void SetExtendedStyle(Control control, ListViewExtendedStyles exStyle)
{
ListViewExtendedStyles styles;
styles = (ListViewExtendedStyles)SendMessage(control.Handle, (int)ListViewMessages.GetExtendedStyle, 0, 0);
styles |= exStyle;
SendMessage(control.Handle, (int)ListViewMessages.SetExtendedStyle, 0, (int)styles);
}
public static void EnableDoubleBuffer(Control control)
{
ListViewExtendedStyles styles;
// read current style
styles = (ListViewExtendedStyles)SendMessage(control.Handle, (int)ListViewMessages.GetExtendedStyle, 0, 0);
// enable double buffer and border select
styles |= ListViewExtendedStyles.DoubleBuffer | ListViewExtendedStyles.BorderSelect;
// write new style
SendMessage(control.Handle, (int)ListViewMessages.SetExtendedStyle, 0, (int)styles);
}
public static void DisableDoubleBuffer(Control control)
{
ListViewExtendedStyles styles;
// read current style
styles = (ListViewExtendedStyles)SendMessage(control.Handle, (int)ListViewMessages.GetExtendedStyle, 0, 0);
// disable double buffer and border select
styles -= styles & ListViewExtendedStyles.DoubleBuffer;
styles -= styles & ListViewExtendedStyles.BorderSelect;
// write new style
SendMessage(control.Handle, (int)ListViewMessages.SetExtendedStyle, 0, (int)styles);
}
}
公共枚举ListViewExtendedStyles
{
///
///LVS_EX_网格线
///
网格线=0x00000001,
///
///LVS_EX_子项图像
///
子项图像=0x00000002,
///
///LVS_EX_复选框
///
复选框=0x00000004,
///
///LVS_EX_轨迹选择
///
TrackSelect=0x00000008,
///
///LVS_EX_HEADERDRAGDROP
///
HeaderDragDrop=0x00000010,
///
///LVS_EX_FULLROWSELECT
///
FullRowSelect=0x00000020,
///
///LVS_EX_One单击激活
///
OneClickActivate=0x00000040,
///
///LVS_EX_Two单击激活
///
两次单击激活=0x00000080,
///
///LVS_EX_FLATSB
///
FlatsB=0x00000100,
///
///LVS_前_地区
///
区域=0x00000200,
///
///LVS_EX_信息提示
///
InfoTip=0x00000400,
///
///LVS_EX_UNDERLINEHOT
///
下划线HOT=0x00000800,
///
///LVS_EX_UNDERLINECOLD
///
下划线COLD=0x00001000,
///
///LVS_EX_多工作区
///
多工作区=0x000020000,
///
///LVS_EX_LABELTIP
///
LabelTip=0x00004000,
///
///LVS_EX_BORDERSELECT
///
BorderSelect=0x00008000,
///
///LVS_EX_双缓冲区
///
DoubleBuffer=0x00010000,
///
///LVS_EX_HIDELABELS
///
HideLabels=0x00020000,
///
///LVS_EX_SINGLEROW
///
单行=0x00040000,
///
///LVS_EX_SNAPTOGRID
///
SnapToGrid=0x00080000,
///
///LVS_EX_SIMPLESELECT
///
SimpleSelect=0x00100000
}
公共枚举ListViewMessages
{
第一个=0x1000,
SetExtendedStyle=(第一个+54),
GetExtendedStyle=(第一个+55),
}
///
///包含用于更改ListView上扩展样式的帮助器方法,包括启用双缓冲。
///根据Giovanni Montrone关于
///
公共类ListViewHelper
{
私有ListViewHelper()
{
}
[DllImport(“user32.dll”,CharSet=CharSet.Auto)]
私有静态外部int SendMessage(IntPtr句柄、int messg、int wparam、int lparam);
公共静态void SetExtendedStyle(控件控件,ListViewExtendedStyles exStyle)
{
ListViewExtendedStyles;
styles=(ListViewExtendedStyles)SendMessage(control.Handle,(int)ListViewMessages.GetExtendedStyle,0,0);
样式|=exStyle;
SendMessage(control.Handle,(int)ListViewMessages.SetExtendedStyle,0,(int)styles);
}
公共静态无效启用DoubleBuffer(控制)
{
ListViewExtendedStyles;
//阅读当前样式
styles=(ListViewExtendedStyles)SendMessage(control.Handle,(int)ListViewMessages.GetExtendedStyle,0,0);
//启用双缓冲区和边框选择
styles |=ListViewExtendedStyles.DoubleBuffer | ListViewExtendedStyles.BorderSelect;
//写新文体
SendMessage(control.Handle,(int)ListViewMessages.SetExtendedStyle,0,(int)styles);
}
公共静态无效禁用DoubleBuffer(控制)
{
ListViewExtendedStyles;
//阅读当前样式
styles=(ListViewExtendedStyles)SendMessage(control.Handle,(int)ListViewMessages.GetExtendedStyle,0,0);
//禁用双缓冲区和边框选择
样式-=样式和ListViewExtendedStyles.DoubleBuffer;
样式-=样式和列表视图ExtendedStyles.BorderSelect;
//写新文体
SendMessage(control.Handle,(int)ListViewMessages.SetExtendedStyle,0,(int)styles);
}
}
在.NET Winforms 2.0中,存在一个名为DoubleBuffered的受保护属性 通过从ListView继承,可以将此受保护属性设置为true。这将启用双缓冲,而无需调用SendMessage 设置DoubleBuffered属性与设置以下样式相同:
listview.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
这将有助于:
class DoubleBufferedListView : System.Windows.Forms.ListView
{
public DoubleBufferedListView()
:base()
{
this.DoubleBuffered = true;
}
}
在设置任何列表视图项之前调用ListView上的BeginUpdate()方法,然后仅在添加所有项之后调用EndUpdate()
这将停止闪烁。接受的答案是可行的,但相当长,并且从控件(如其他答案中所述)中派生出来的只是启用双缓冲也有点过头了。但幸运的是,我们有反射,如果愿意的话,还可以调用内部方法(但请确保您所做的!) 将此方法封装到扩展me中
listview.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
class DoubleBufferedListView : System.Windows.Forms.ListView
{
public DoubleBufferedListView()
:base()
{
this.DoubleBuffered = true;
}
}
public static class ControlExtensions
{
public static void DoubleBuffering(this Control control, bool enable)
{
var method = typeof(Control).GetMethod("SetStyle", BindingFlags.Instance | BindingFlags.NonPublic);
method.Invoke(control, new object[] { ControlStyles.OptimizedDoubleBuffer, enable });
}
}
InitializeComponent();
myListView.DoubleBuffering(true); //after the InitializeComponent();
public static void DoubleBuffered(this Control control, bool enable)
{
var doubleBufferPropertyInfo = control.GetType().GetProperty("DoubleBuffered", BindingFlags.Instance | BindingFlags.NonPublic);
doubleBufferPropertyInfo.SetValue(control, enable, null);
}