数据库操作 用另一个线程提交。Thread tnew = new Thread(new ThreadStart(数据库操作)); tnew.Start();
使用多线程。 简单点可以使用微软提供的BackgroundWorker。
引用: greatqn(一剑) 数据库操作 用另一个线程提交。Thread tnew = new Thread(new ThreadStart(数据库操作)); tnew.Start();正解!
BackgroundWorker是2.0新增加的类,可用于执行长耗时操作,例子如下: 下面的代码示例演示如何使用 BackgroundWorker 类异步执行耗时的操作。该操作计算选定的斐波纳契数,在计算过程中报告进度更新,并允许取消挂起的计算。 using System; using System.Collections; using System.ComponentModel; using System.Drawing; using System.Threading; using System.Windows.Forms;namespace BackgroundWorkerExample { public class FibonacciForm : System.Windows.Forms.Form { private int numberToCompute = 0; private int highestPercentageReached = 0; private System.Windows.Forms.NumericUpDown numericUpDown1; private System.Windows.Forms.Button startAsyncButton; private System.Windows.Forms.Button cancelAsyncButton; private System.Windows.Forms.ProgressBar progressBar1; private System.Windows.Forms.Label resultLabel; private System.ComponentModel.BackgroundWorker backgroundWorker1; public FibonacciForm() { InitializeComponent(); InitializeBackgoundWorker(); } // Set up the BackgroundWorker object by // attaching event handlers. private void InitializeBackgoundWorker() { backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork); backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler( backgroundWorker1_RunWorkerCompleted); backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler( backgroundWorker1_ProgressChanged); }
private void startAsyncButton_Click(System.Object sender, System.EventArgs e) { // Reset the text in the result label. resultLabel.Text = String.Empty; // Disable the UpDown control until // the asynchronous operation is done. this.numericUpDown1.Enabled = false; // Disable the Start button until // the asynchronous operation is done. this.startAsyncButton.Enabled = false; // Enable the Cancel button while // the asynchronous operation runs. this.cancelAsyncButton.Enabled = true; // Get the value from the UpDown control. numberToCompute = (int)numericUpDown1.Value; // Reset the variable for percentage tracking. highestPercentageReached = 0; // Start the asynchronous operation. backgroundWorker1.RunWorkerAsync(numberToCompute); } private void cancelAsyncButton_Click(System.Object sender, System.EventArgs e) { // Cancel the asynchronous operation. this.backgroundWorker1.CancelAsync(); // Disable the Cancel button. cancelAsyncButton.Enabled = false; } // This event handler is where the actual, // potentially time-consuming work is done. private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { // Get the BackgroundWorker that raised this event. BackgroundWorker worker = sender as BackgroundWorker; // Assign the result of the computation // to the Result property of the DoWorkEventArgs // object. This is will be available to the // RunWorkerCompleted eventhandler. e.Result = ComputeFibonacci((int)e.Argument, worker, e); } // This event handler deals with the results of the // background operation. private void backgroundWorker1_RunWorkerCompleted( object sender, RunWorkerCompletedEventArgs e) { // First, handle the case where an exception was thrown. if (e.Error != null) { MessageBox.Show(e.Error.Message); } else if (e.Cancelled) { // Next, handle the case where the user canceled // the operation. // Note that due to a race condition in // the DoWork event handler, the Cancelled // flag may not have been set, even though // CancelAsync was called. resultLabel.Text = "Canceled"; } else { // Finally, handle the case where the operation // succeeded. resultLabel.Text = e.Result.ToString(); } // Enable the UpDown control. this.numericUpDown1.Enabled = true; // Enable the Start button. startAsyncButton.Enabled = true; // Disable the Cancel button. cancelAsyncButton.Enabled = false; } // This event handler updates the progress bar. private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) { this.progressBar1.Value = e.ProgressPercentage; } // This is the method that does the actual work. For this // example, it computes a Fibonacci number and // reports progress as it does its work. long ComputeFibonacci(int n, BackgroundWorker worker, DoWorkEventArgs e) { // The parameter n must be >= 0 and <= 91. // Fib(n), with n > 91, overflows a long. if ((n < 0) || (n > 91)) { throw new ArgumentException( "value must be >= 0 and <= 91", "n"); } long result = 0; // Abort the operation if the user has canceled. // Note that a call to CancelAsync may have set // CancellationPending to true just after the // last invocation of this method exits, so this // code will not have the opportunity to set the // DoWorkEventArgs.Cancel flag to true. This means // that RunWorkerCompletedEventArgs.Cancelled will // not be set to true in your RunWorkerCompleted // event handler. This is a race condition. if (worker.CancellationPending) { e.Cancel = true; } else { if (n < 2) { result = 1; } else { result = ComputeFibonacci(n - 1, worker, e) + ComputeFibonacci(n - 2, worker, e); } // Report progress as a percentage of the total task. int percentComplete = (int)((float)n / (float)numberToCompute * 100); if (percentComplete > highestPercentageReached) { highestPercentageReached = percentComplete; worker.ReportProgress(percentComplete); } } return result; }
tnew.Start();
简单点可以使用微软提供的BackgroundWorker。
tnew.Start();正解!
下面的代码示例演示如何使用 BackgroundWorker 类异步执行耗时的操作。该操作计算选定的斐波纳契数,在计算过程中报告进度更新,并允许取消挂起的计算。
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;namespace BackgroundWorkerExample
{
public class FibonacciForm : System.Windows.Forms.Form
{
private int numberToCompute = 0;
private int highestPercentageReached = 0; private System.Windows.Forms.NumericUpDown numericUpDown1;
private System.Windows.Forms.Button startAsyncButton;
private System.Windows.Forms.Button cancelAsyncButton;
private System.Windows.Forms.ProgressBar progressBar1;
private System.Windows.Forms.Label resultLabel;
private System.ComponentModel.BackgroundWorker backgroundWorker1; public FibonacciForm()
{
InitializeComponent(); InitializeBackgoundWorker();
} // Set up the BackgroundWorker object by
// attaching event handlers.
private void InitializeBackgoundWorker()
{
backgroundWorker1.DoWork +=
new DoWorkEventHandler(backgroundWorker1_DoWork);
backgroundWorker1.RunWorkerCompleted +=
new RunWorkerCompletedEventHandler(
backgroundWorker1_RunWorkerCompleted);
backgroundWorker1.ProgressChanged +=
new ProgressChangedEventHandler(
backgroundWorker1_ProgressChanged);
}
private void startAsyncButton_Click(System.Object sender,
System.EventArgs e)
{
// Reset the text in the result label.
resultLabel.Text = String.Empty; // Disable the UpDown control until
// the asynchronous operation is done.
this.numericUpDown1.Enabled = false; // Disable the Start button until
// the asynchronous operation is done.
this.startAsyncButton.Enabled = false; // Enable the Cancel button while
// the asynchronous operation runs.
this.cancelAsyncButton.Enabled = true; // Get the value from the UpDown control.
numberToCompute = (int)numericUpDown1.Value; // Reset the variable for percentage tracking.
highestPercentageReached = 0; // Start the asynchronous operation.
backgroundWorker1.RunWorkerAsync(numberToCompute);
} private void cancelAsyncButton_Click(System.Object sender,
System.EventArgs e)
{
// Cancel the asynchronous operation.
this.backgroundWorker1.CancelAsync(); // Disable the Cancel button.
cancelAsyncButton.Enabled = false;
} // This event handler is where the actual,
// potentially time-consuming work is done.
private void backgroundWorker1_DoWork(object sender,
DoWorkEventArgs e)
{
// Get the BackgroundWorker that raised this event.
BackgroundWorker worker = sender as BackgroundWorker; // Assign the result of the computation
// to the Result property of the DoWorkEventArgs
// object. This is will be available to the
// RunWorkerCompleted eventhandler.
e.Result = ComputeFibonacci((int)e.Argument, worker, e);
} // This event handler deals with the results of the
// background operation.
private void backgroundWorker1_RunWorkerCompleted(
object sender, RunWorkerCompletedEventArgs e)
{
// First, handle the case where an exception was thrown.
if (e.Error != null)
{
MessageBox.Show(e.Error.Message);
}
else if (e.Cancelled)
{
// Next, handle the case where the user canceled
// the operation.
// Note that due to a race condition in
// the DoWork event handler, the Cancelled
// flag may not have been set, even though
// CancelAsync was called.
resultLabel.Text = "Canceled";
}
else
{
// Finally, handle the case where the operation
// succeeded.
resultLabel.Text = e.Result.ToString();
} // Enable the UpDown control.
this.numericUpDown1.Enabled = true; // Enable the Start button.
startAsyncButton.Enabled = true; // Disable the Cancel button.
cancelAsyncButton.Enabled = false;
} // This event handler updates the progress bar.
private void backgroundWorker1_ProgressChanged(object sender,
ProgressChangedEventArgs e)
{
this.progressBar1.Value = e.ProgressPercentage;
} // This is the method that does the actual work. For this
// example, it computes a Fibonacci number and
// reports progress as it does its work.
long ComputeFibonacci(int n, BackgroundWorker worker, DoWorkEventArgs e)
{
// The parameter n must be >= 0 and <= 91.
// Fib(n), with n > 91, overflows a long.
if ((n < 0) || (n > 91))
{
throw new ArgumentException(
"value must be >= 0 and <= 91", "n");
} long result = 0; // Abort the operation if the user has canceled.
// Note that a call to CancelAsync may have set
// CancellationPending to true just after the
// last invocation of this method exits, so this
// code will not have the opportunity to set the
// DoWorkEventArgs.Cancel flag to true. This means
// that RunWorkerCompletedEventArgs.Cancelled will
// not be set to true in your RunWorkerCompleted
// event handler. This is a race condition. if (worker.CancellationPending)
{
e.Cancel = true;
}
else
{
if (n < 2)
{
result = 1;
}
else
{
result = ComputeFibonacci(n - 1, worker, e) +
ComputeFibonacci(n - 2, worker, e);
} // Report progress as a percentage of the total task.
int percentComplete =
(int)((float)n / (float)numberToCompute * 100);
if (percentComplete > highestPercentageReached)
{
highestPercentageReached = percentComplete;
worker.ReportProgress(percentComplete);
}
} return result;
}
private void InitializeComponent()
{
this.numericUpDown1 = new System.Windows.Forms.NumericUpDown();
this.startAsyncButton = new System.Windows.Forms.Button();
this.cancelAsyncButton = new System.Windows.Forms.Button();
this.resultLabel = new System.Windows.Forms.Label();
this.progressBar1 = new System.Windows.Forms.ProgressBar();
this.backgroundWorker1 = new System.ComponentModel.BackgroundWorker();
((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).BeginInit();
this.SuspendLayout();
//
// numericUpDown1
//
this.numericUpDown1.Location = new System.Drawing.Point(16, 16);
this.numericUpDown1.Maximum = new System.Decimal(new int[] {
91,
0,
0,
0});
this.numericUpDown1.Minimum = new System.Decimal(new int[] {
1,
0,
0,
0});
this.numericUpDown1.Name = "numericUpDown1";
this.numericUpDown1.Size = new System.Drawing.Size(80, 20);
this.numericUpDown1.TabIndex = 0;
this.numericUpDown1.Value = new System.Decimal(new int[] {
1,
0,
0,
0});
//
// startAsyncButton
//
this.startAsyncButton.Location = new System.Drawing.Point(16, 72);
this.startAsyncButton.Name = "startAsyncButton";
this.startAsyncButton.Size = new System.Drawing.Size(120, 23);
this.startAsyncButton.TabIndex = 1;
this.startAsyncButton.Text = "Start Async";
this.startAsyncButton.Click += new System.EventHandler(this.startAsyncButton_Click);
//
// cancelAsyncButton
//
this.cancelAsyncButton.Enabled = false;
this.cancelAsyncButton.Location = new System.Drawing.Point(153, 72);
this.cancelAsyncButton.Name = "cancelAsyncButton";
this.cancelAsyncButton.Size = new System.Drawing.Size(119, 23);
this.cancelAsyncButton.TabIndex = 2;
this.cancelAsyncButton.Text = "Cancel Async";
this.cancelAsyncButton.Click += new System.EventHandler(this.cancelAsyncButton_Click);
//
// resultLabel
//
this.resultLabel.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.resultLabel.Location = new System.Drawing.Point(112, 16);
this.resultLabel.Name = "resultLabel";
this.resultLabel.Size = new System.Drawing.Size(160, 23);
this.resultLabel.TabIndex = 3;
this.resultLabel.Text = "(no result)";
this.resultLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// progressBar1
//
this.progressBar1.Location = new System.Drawing.Point(18, 48);
this.progressBar1.Name = "progressBar1";
this.progressBar1.Size = new System.Drawing.Size(256, 8);
this.progressBar1.Step = 2;
this.progressBar1.TabIndex = 4;
//
// backgroundWorker1
//
this.backgroundWorker1.WorkerReportsProgress = true;
this.backgroundWorker1.WorkerSupportsCancellation = true;
//
// FibonacciForm
//
this.ClientSize = new System.Drawing.Size(292, 118);
this.Controls.Add(this.progressBar1);
this.Controls.Add(this.resultLabel);
this.Controls.Add(this.cancelAsyncButton);
this.Controls.Add(this.startAsyncButton);
this.Controls.Add(this.numericUpDown1);
this.Name = "FibonacciForm";
this.Text = "Fibonacci Calculator";
((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).EndInit();
this.ResumeLayout(false); }
#endregion [STAThread]
static void Main()
{
Application.Run(new FibonacciForm());
}
}
}
Thread tpp = new Thread(new ThreadStart(ConvertSingle(tbBillId.Text, tbMonth.Text)));
tpp.Start();
报:应输入方法名称ConvertSingle(tbBillId.Text, tbMonth.Text) 这个过程是处理数据库的
Thread tpp = new Thread(new ThreadStart(ConvertSingle));
Thread tpp = new Thread(new ThreadStart(ConvertSingle));