如何创建多线程更新ProgressBar进度和利用lable控件来显示完成百分比

2008-11-21 05:06:24 1.1k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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如何创建多线程更新ProgressBar进度和利用lable控件来显示完成百分比 ProgressBar在工作时窗体不失效,可以自由拖动窗体,先谢过大家了

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tong730

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切换为时间正序

Eleve 2010-01-19

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2楼的经典示范让我必须mark一下这个帖子

InsistOnDoing 2009-12-22

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2楼写的很好，顶一个

程序员Linc 2008-11-24

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学习了
up

tong730 2008-11-24

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不知道为什么　窗体还是失效了　问题究竟在哪里？代码如下：
Public MyThread As System.Threading.Thread
Delegate Sub MyInvoke(ByVal Percent As Integer)
Dim ShowResult As New MyInvoke(AddressOf ShowInvoke)
Dim table As New DataTable

Private Sub 导出数据_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 导出数据.Click

strSelect = "Select 学校代码,学校,类型,院系,专业,班号,代码学号,学号,姓名,性别,电话,身份证号,毕业年份,拍摄标志,摄影师,日期,备注 from StudentTable where 学校='" + xx.Text + "' And 类型 = '" + lx.Text + "' And 拍摄标志='" + "1" + "'"

table = Editdata.Search(ConnStr, strSelect)
CysmManageSystem.TSPBar1.Maximum = table.Rows.Count
CysmManageSystem.TSPBar1.Visible = True
CysmManageSystem.TSSL1.Visible = True
Dim MyDelegate As New System.Threading.ThreadStart(AddressOf xxupdate1)
Dim MyThread As New System.Threading.Thread(MyDelegate)
MyThread.Start()

Private Sub xxupdate1()
Dim AcConnStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\data\Main.mdb"

Dim MyConnection As System.Data.OleDb.OleDbConnection = Nothing

MyConnection = New _
System.Data.OleDb.OleDbConnection(AcConnStr)
MyConnection.Open()

For i As Integer = 0 To table.Rows.Count - 1
标准的ＳＱＬ插入语句　省略了
Dim MyCommand As System.Data.OleDb.OleDbCommand = New OleDbCommand(SQLString, MyConnection)
MyCommand.ExecuteNonQuery()
BeginInvoke(ShowResult, i)
Next
End Sub

Private Sub ShowInvoke(ByVal Percent As Integer)
Me.Label10.Text = Percent
me.TSPBar1.Value = Percent

End Sub

长沙三毛 2008-11-21

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请参考：C#组件设计技术兼谈带百分比进度条组件TSmartProgressBar的实现

blues_zhao_yang 2008-11-21

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[Quote=引用 9 楼 tong730 的回复:]
非常感谢楼上的　但我用进度条检索数据库里的记录里　因数据库的记录不会正好是１００条的　如何才能正确的显示百分比？
[/Quote]

诸如检索数据库这类程序，由于无法预先估计工作量，所以很难做到准确的控制任务进行的百分比，只能大致估计一下。

如果你只是想显示处理了多少条数据的话，可以用你检索的数据总量和100做一个比值，每处理完一定的数据百分比就+1

或者可以用进度条的ProgressBar.Style = ProgressBarStyle.Marquee样式来表示任务正在进行，不过这样无法让用户得知任务进度，而且在不支持此样式的操作系统中效果会消失。

wangjuenhui520 2008-11-21

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我是初学者,提个建议,你应该先算出数据的数量. 如果你的progressbar 的单次移动数量是1 ,则除100,结果就是多少笔记录移动一格咯. 然后你的label 就= 你的进度条的value

tong730 2008-11-21

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非常感谢楼上的　但我用进度条检索数据库里的记录里　因数据库的记录不会正好是１００条的　如何才能正确的显示百分比？

一只熊猫 2008-11-21

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简单的程序用用 My.Application.DoEvents 就行了

blues_zhao_yang 2008-11-21

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窗体：FormThreadInvoke
文本框：TextBoxPercentage
按钮：ButtonStart
ButtonStop
进度条：ProgressBarPercentage

blues_zhao_yang 2008-11-21

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    Dim MyThread As New System.Threading.Thread(AddressOf RunWork)

    Delegate Sub MyInvoke(ByVal Percent As Integer)

    Dim ShowResult As New MyInvoke(AddressOf ShowInvoke)



    Private Sub FormThreadInvoke_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        ProgressBarPercentage.Minimum = 0

        ProgressBarPercentage.Maximum = 100

    End Sub



    Private Sub ButtonStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonStart.Click

        MyThread.Start()

    End Sub



    Private Sub ButtonStop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonStop.Click

        MyThread.Abort()

    End Sub



    Private Sub RunWork()

        For i = 0 To 100

            BeginInvoke(ShowResult, i)

            System.Threading.Thread.Sleep(100)

        Next

    End Sub



    Private Sub ShowInvoke(ByVal Percent As Integer)

        TextBoxPercentage.Text = Percent & "%"

        ProgressBarPercentage.Value = Percent

        If Percent = 100 Then

            MsgBox("任务完成！")

            MyThread.Abort()

        End If

    End Sub

tong730 2008-11-21

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晕　Ｃ的代码不熟　能不能转换成ＶＢ.NET的呀　谢谢了

android2008 2008-11-21

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帮顶

filec75 2008-11-21

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友情up

tinghai_xu 2008-11-21

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或者考虑使用 BackgroundWorker 组件也可以

tinghai_xu 2008-11-21

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请参考：



using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading;



namespace TestWinForm

{

    public partial class Form1 : Form

    {

        delegate void SetValueCallback(int value);



        public Form1()

        {

            InitializeComponent();

        }



        private void btnRun_Click(object sender, EventArgs e)

        {

            Thread t = new Thread(new ThreadStart(Foo));

            t.Start();

        }



        private void Foo()

        {

            for (int i = 1; i <= 100; i++)

            {

                Thread.Sleep(100);

                SetProcessBarValue(i);

                SetLabelValue(i);

            }

        }



        private void SetLabelValue(int value)

        {

            // InvokeRequired required compares the thread ID of the

            // calling thread to the thread ID of the creating thread.

            // If these threads are different, it returns true.

            if (this.lblStatus.InvokeRequired)

            {

                SetValueCallback d = new SetValueCallback(SetLabelValue);

                this.Invoke(d, new object[] { value });

            }

            else

            {

                this.lblStatus.Text = value.ToString()+'%';

            }

        }



        private void SetProcessBarValue(int value)

        {

            // InvokeRequired required compares the thread ID of the

            // calling thread to the thread ID of the creating thread.

            // If these threads are different, it returns true.

            if (this.prbStatus.InvokeRequired)

            {

                SetValueCallback d = new SetValueCallback(SetProcessBarValue);

                this.Invoke(d, new object[] { value });

            }

            else

            {

                this.prbStatus.Value = value;

            }

        }

    }

}



namespace TestWinForm

{

    partial class Form1

    {

        /// <summary>

        /// Required designer variable.

        /// </summary>

        private System.ComponentModel.IContainer components = null;



        /// <summary>

        /// Clean up any resources being used.

        /// </summary>

        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }



        #region Windows Form Designer generated code



        /// <summary>

        /// Required method for Designer support - do not modify

        /// the contents of this method with the code editor.

        /// </summary>

        private void InitializeComponent()

        {

            this.prbStatus = new System.Windows.Forms.ProgressBar();

            this.btnRun = new System.Windows.Forms.Button();

            this.lblStatus = new System.Windows.Forms.Label();

            this.SuspendLayout();

            // 

            // prbStatus

            // 

            this.prbStatus.Location = new System.Drawing.Point(43, 44);

            this.prbStatus.Name = "prbStatus";

            this.prbStatus.Size = new System.Drawing.Size(296, 23);

            this.prbStatus.TabIndex = 0;

            // 

            // btnRun

            // 

            this.btnRun.Location = new System.Drawing.Point(190, 99);

            this.btnRun.Name = "btnRun";

            this.btnRun.Size = new System.Drawing.Size(75, 23);

            this.btnRun.TabIndex = 1;

            this.btnRun.Text = "Run";

            this.btnRun.UseVisualStyleBackColor = true;

            this.btnRun.Click += new System.EventHandler(this.btnRun_Click);

            // 

            // lblStatus

            // 

            this.lblStatus.AutoSize = true;

            this.lblStatus.Location = new System.Drawing.Point(367, 54);

            this.lblStatus.Name = "lblStatus";

            this.lblStatus.Size = new System.Drawing.Size(0, 13);

            this.lblStatus.TabIndex = 2;

            // 

            // Form1

            // 

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.ClientSize = new System.Drawing.Size(496, 266);

            this.Controls.Add(this.lblStatus);

            this.Controls.Add(this.btnRun);

            this.Controls.Add(this.prbStatus);

            this.Name = "Form1";

            this.Text = "Form1";

            this.ResumeLayout(false);

            this.PerformLayout();



        }



        #endregion



        private System.Windows.Forms.ProgressBar prbStatus;

        private System.Windows.Forms.Button btnRun;

        private System.Windows.Forms.Label lblStatus;

    }

}

如何创建多线程更新ProgressBar进度和利用lable控件来显示完成百分比

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