C# Progressbar不移动(WinForms、.Net和BackgroundWorker) 介绍
我正在尝试使用C# Progressbar不移动(WinForms、.Net和BackgroundWorker) 介绍,c#,.net,winforms,progress-bar,C#,.net,Winforms,Progress Bar,我正在尝试使用.Net制作一个WinForms应用程序 我使用的教程显示了BackgroundWorker和ProgressBar集成 我在表单中添加了ProgressBar和BackgroundWorker控件。 这些名称与示例中的名称相同。另外,我将BackgroundWorker的WorkerReportProgress属性设置为True。未显示任何错误,项目已成功编译 问题 问题是-progressbar不移动。 然而,当手动单击时,它会移动progressBar1.PerformSte
.Net
制作一个WinForms
应用程序
我使用的教程显示了BackgroundWorker
和ProgressBar
集成
我在表单中添加了ProgressBar
和BackgroundWorker
控件。
这些名称与示例中的名称相同。另外,我将BackgroundWorker
的WorkerReportProgress
属性设置为True
。未显示任何错误,项目已成功编译
问题
问题是-progressbar不移动。
然而,当手动单击时,它会移动<代码>progressBar1.PerformStep()代码>
我错过了什么
密码
表格1.cs
使用系统;
使用System.Collections.Generic;
使用系统组件模型;
使用系统数据;
使用系统图;
使用System.Linq;
使用系统文本;
使用System.Threading.Tasks;
使用System.Windows.Forms;
使用系统线程;
命名空间WindowsFormsApp2
{
公共部分类Form1:Form
{
公共表格1()
{
初始化组件();
}
私有void Form1_加载(对象发送方,System.EventArgs e)
{
//启动后台工作人员。
BackgroundWorker1.RunWorkerAsync();
}
私有void BackgroundWorker1\u DoWork(对象发送方,DoWorkEventArgs e)
{
对于(int i=1;i,在确保将事件处理程序附加到ProgressChanged
和DoWork
之后:
从DoWork
事件处理程序中删除progressBar1.PerformStep()
然后在ProgressChanged
事件处理程序中仅使用progressBar1.Value=e.ProgressPercentage;
几年前,我用Progress条形码编写了一个简单的多线程。希望它能帮助您:
#region Primenumbers
private void btnPrimStart_Click(object sender, EventArgs e)
{
if (!bgwPrim.IsBusy)
{
//Prepare ProgressBar and Textbox
int temp = (int)nudPrim.Value;
pgbPrim.Maximum = temp;
tbPrim.Text = "";
//Start processing
bgwPrim.RunWorkerAsync(temp);
}
}
private void btnPrimCancel_Click(object sender, EventArgs e)
{
if (bgwPrim.IsBusy)
{
bgwPrim.CancelAsync();
}
}
private void bgwPrim_DoWork(object sender, DoWorkEventArgs e)
{
int highestToCheck = (int)e.Argument;
//Get a reference to the BackgroundWorker running this code
//for Progress Updates and Cancelation checking
BackgroundWorker thisWorker = (BackgroundWorker)sender;
//Create the list that stores the results and is returned by DoWork
List<int> Primes = new List<int>();
//Check all uneven numbers between 1 and whatever the user choose as upper limit
for(int PrimeCandidate=1; PrimeCandidate < highestToCheck; PrimeCandidate+=2)
{
//Report progress
thisWorker.ReportProgress(PrimeCandidate);
bool isNoPrime = false;
//Check if the Cancelation was requested during the last loop
if (thisWorker.CancellationPending)
{
//Tell the Backgroundworker you are canceling and exit the for-loop
e.Cancel = true;
break;
}
//Determin if this is a Prime Number
for (int j = 3; j < PrimeCandidate && !isNoPrime; j += 2)
{
if (PrimeCandidate % j == 0)
isNoPrime = true;
}
if (!isNoPrime)
Primes.Add(PrimeCandidate);
}
//Tell the progress bar you are finished
thisWorker.ReportProgress(highestToCheck);
//Save Return Value
e.Result = Primes.ToArray();
}
private void bgwPrim_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
pgbPrim.Value = e.ProgressPercentage;
}
private void bgwPrim_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
pgbPrim.Value = pgbPrim.Maximum;
this.Refresh();
if (!e.Cancelled && e.Error == null)
{
//Show the Result
int[] Primes = (int[])e.Result;
StringBuilder sbOutput = new StringBuilder();
foreach (int Prim in Primes)
{
sbOutput.Append(Prim.ToString() + Environment.NewLine);
}
tbPrim.Text = sbOutput.ToString();
}
else
{
tbPrim.Text = "Operation canceled by user or Exception";
}
}
#endregion
#区域素数
私有无效btnPrimStart\单击(对象发送者,事件参数e)
{
如果(!bgwPrim.IsBusy)
{
//准备进度条和文本框
int temp=(int)nudPrim.Value;
pgbPrim.最大值=温度;
tbPrim.Text=“”;
//开始处理
bgwPrim.RunWorkerAsync(临时);
}
}
私有无效btnprimmcancel\u单击(对象发送者,事件参数e)
{
如果(bgwPrim.IsBusy)
{
bgwPrim.CancelAsync();
}
}
私有void bgwPrim_DoWork(对象发送方,DoWorkEventArgs e)
{
int highestToCheck=(int)e.参数;
//获取运行此代码的BackgroundWorker的引用
//用于进度更新和取消检查
BackgroundWorker thisWorker=(BackgroundWorker)发件人;
//创建存储结果并由DoWork返回的列表
列表素数=新列表();
//检查1和用户选择的任何上限之间的所有不均匀数
对于(int PrimeCandidate=1;PrimeCandidate
通常,当从Alterante线程编写UI元素时,您必须使用。BackgroundWorker很好,可以在创建它的线程上调用“ReportProgress”和“RunWorkerCompleted”事件(应该是GUI线程),因此您还不必处理多线程方面的问题
捕获通常会逃避DoWork并被吞并的任何异常,并在已完成的事件Args中将它们公开给您,这也足够好了。吞并异常是多线程的一个大问题
核心问题是,您的循环由于异常而中断。在内部调用progressBar1.PerformStep();
DoWork事件必须抛出“CrossThreadException”。BackgroundWorker完成(由于异常)立即。当我只是初始值时,会触发RunWorker completed事件。我建议尝试在调用Dispatcher.CurrentDispatcher.Invoke()时包装progressBar1.PerformStep();
)您不应该更新UI,在本例中是从工作线程内更新进度。这就是报告进度
的目的。2)为什么您在工作
和进度更改
中都执行执行步骤
?仅在后者中执行3)不要同时使用执行步骤
和进度Bar1.Value=xxx
@Alex不正确。BackgroundWorker
的要点在于它将在工作线程中执行的操作与UI的更新方式分开。更新是
#region Primenumbers
private void btnPrimStart_Click(object sender, EventArgs e)
{
if (!bgwPrim.IsBusy)
{
//Prepare ProgressBar and Textbox
int temp = (int)nudPrim.Value;
pgbPrim.Maximum = temp;
tbPrim.Text = "";
//Start processing
bgwPrim.RunWorkerAsync(temp);
}
}
private void btnPrimCancel_Click(object sender, EventArgs e)
{
if (bgwPrim.IsBusy)
{
bgwPrim.CancelAsync();
}
}
private void bgwPrim_DoWork(object sender, DoWorkEventArgs e)
{
int highestToCheck = (int)e.Argument;
//Get a reference to the BackgroundWorker running this code
//for Progress Updates and Cancelation checking
BackgroundWorker thisWorker = (BackgroundWorker)sender;
//Create the list that stores the results and is returned by DoWork
List<int> Primes = new List<int>();
//Check all uneven numbers between 1 and whatever the user choose as upper limit
for(int PrimeCandidate=1; PrimeCandidate < highestToCheck; PrimeCandidate+=2)
{
//Report progress
thisWorker.ReportProgress(PrimeCandidate);
bool isNoPrime = false;
//Check if the Cancelation was requested during the last loop
if (thisWorker.CancellationPending)
{
//Tell the Backgroundworker you are canceling and exit the for-loop
e.Cancel = true;
break;
}
//Determin if this is a Prime Number
for (int j = 3; j < PrimeCandidate && !isNoPrime; j += 2)
{
if (PrimeCandidate % j == 0)
isNoPrime = true;
}
if (!isNoPrime)
Primes.Add(PrimeCandidate);
}
//Tell the progress bar you are finished
thisWorker.ReportProgress(highestToCheck);
//Save Return Value
e.Result = Primes.ToArray();
}
private void bgwPrim_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
pgbPrim.Value = e.ProgressPercentage;
}
private void bgwPrim_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
pgbPrim.Value = pgbPrim.Maximum;
this.Refresh();
if (!e.Cancelled && e.Error == null)
{
//Show the Result
int[] Primes = (int[])e.Result;
StringBuilder sbOutput = new StringBuilder();
foreach (int Prim in Primes)
{
sbOutput.Append(Prim.ToString() + Environment.NewLine);
}
tbPrim.Text = sbOutput.ToString();
}
else
{
tbPrim.Text = "Operation canceled by user or Exception";
}
}
#endregion