如何利用ClickOnce布署进行手动在线更新

　　可以使用 CheckForUpdate 或 CheckForUpdateAsync 方法来测试您的部署是否已有可用更新；CheckForUpdateAsync 方法在成功完成后会引发 CheckForUpdateCompleted 事件。CheckForDetailedUpdate 将返回有关更新的重要信息，如版本号以及对当前用户而言是否为必需的更新。如果有可用的更新，则可使用 Update 或 UpdateAsync 来安装更新；UpdateAsync 方法在更新安装完成后会引发 UpdateCompleted 事件。对于大型更新，可通过 CheckForUpdateProgressChanged 和 UpdateProgressChanged 事件接收进度通知，并使用 ProgressChangedEventArgs 中的信息通知用户下载状态。
在下面的示例代码中，是用一个Form来承载更新的过程信息，也可以把示例代码中的相应事件写到进行手动更新的Buttonk中，具体如何，请读者自己琢磨哦，在Msdn中也有相应的资料，不过在msdn的代码示例中少了一行代码，可让我糊涂了好一会，后面找到原因，发现自己有时真的也不太聪明啊^_^
　　代码示例如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Deployment.Application;

namespace TestUpdate
{
public partial class pupdate : Form
{
public pupdate()
{
InitializeComponent();
}

private void pupdate_Load(object sender, EventArgs e)
{
downloadStatus.Text = "";
//ProgressStatus.ProgressBarColor = Color.BlueViolet;
UpdateApplication();

}
long sizeOfUpdate = 0;

//开始检测更新
private void UpdateApplication()
{
if (System.Deployment.Application.ApplicationDeployment.IsNetworkDeployed)
{
System.Deployment.Application.ApplicationDeployment ad = System.Deployment.Application.ApplicationDeployment.CurrentDeployment;
ad.CheckForUpdateCompleted += new System.Deployment.Application.CheckForUpdateCompletedEventHandler(ad_CheckForUpdateCompleted);
ad.CheckForUpdateProgressChanged += new System.Deployment.Application.DeploymentProgressChangedEventHandler(ad_CheckForUpdateProgressChanged);

ad.CheckForUpdateAsync();
}
}

void ad_CheckForUpdateProgressChanged(object sender, System.Deployment.Application.DeploymentProgressChangedEventArgs e)
{
String progressText = String.Format("下载中： {0}. {1:D}K of {2:D}K 已下载。", GetProgressString(e.State), e.BytesCompleted / 1024, e.BytesTotal / 1024);
ProgressStatus.Value = e.ProgressPercentage;//给进度条赋值
downloadStatus.Text = "启动智能升级程序" + e.ProgressPercentage.ToString() + "%";
}

string GetProgressString(System.Deployment.Application.DeploymentProgressState state)
{
if (state == System.Deployment.Application.DeploymentProgressState.DownloadingApplicationFiles)
{
return "正在下载组成应该应用程序的DLL与数据文件";
}
else if (state == DeploymentProgressState.DownloadingApplicationInformation)
{
return "正在下载应该程序清单";
}
else
{
return "配置程序清单";
}
}

void ad_CheckForUpdateCompleted(object sender, CheckForUpdateCompletedEventArgs e)
{
if (e.Error != null)
{
MessageBox.Show("错误：对不起，您不能更新当前版本！原因：\n" + e.Error.Message + "\n请与软件发布者联系！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
this.Dispose();
}
else if (e.Cancelled == true)
{
MessageBox.Show("当前更新已取消！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
this.Dispose();
}

// Ask the user if they would like to update the application now.
if (e.UpdateAvailable)
{
sizeOfUpdate = e.UpdateSizeBytes;

if (!e.IsUpdateRequired)
{
DialogResult dr = MessageBox.Show("检测到有可用更新，确定升级当前版本吗？", "更新检测", MessageBoxButtons.OKCancel);
if (DialogResult.OK == dr)
{
BeginUpdate();
}
else
{
ApplicationDeployment.CurrentDeployment.UpdateAsyncCancel();
this.Close();
}
}
else
{
MessageBox.Show("检测到有可用更新，将重起该软件系统，进行强制更新！");
BeginUpdate();
}
}
else
{
DialogResult dr = MessageBox.Show("您计算机上安装的出租房屋管理系统已是最新版本，此时不需要更新！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
if (DialogResult.OK == dr)
{
this.Dispose();
}

}
}

//开始更新
private void BeginUpdate()
{
this.Text = "出租房屋管理系统在线升级程序";
ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;
ad.UpdateCompleted += new AsyncCompletedEventHandler(ad_UpdateCompleted);

// Indicate progress in the application's status bar.
ad.UpdateProgressChanged += new DeploymentProgressChangedEventHandler(ad_UpdateProgressChanged);
ad.UpdateAsync();
}

void ad_UpdateProgressChanged(object sender, DeploymentProgressChangedEventArgs e)
{
String progressText = String.Format("已完成下载{1:D}K 中的{0:D}K - 已完成：{2:D}%", e.BytesCompleted / 1024, e.BytesTotal / 1024, e.ProgressPercentage);
downloadStatus.Text = progressText;
ProgressStatus.Value = e.ProgressPercentage;//给进度条赋值
}

void ad_UpdateCompleted(object sender, AsyncCompletedEventArgs e)
{
DialogResult dr = DialogResult.None;
if (e.Cancelled)
{
dr = MessageBox.Show("应用程序更新已被取消！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
if (DialogResult.OK == dr)
{
this.Close();
}

}
else if (e.Error != null)
{
dr = MessageBox.Show("错误：对不起，不能更新当前版本！原因：\n" + e.Error.Message + "\n请与软件发布者联系！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
if (DialogResult.OK == dr)
{
this.Close();
}
}

dr = MessageBox.Show("更新成功！是否现在重起应用程序？(如果您现在不重起，当前使用的还是旧版本，最新版本将下次起动本系统时使用！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
if (DialogResult.OK == dr)
{
Application.Restart();
}
else if (DialogResult.Cancel == dr)
{
this.Close();
}
}

//取消更新
private void btnCancel_Click(object sender, EventArgs e)
{
DialogResult dr = MessageBox.Show("确定取消当前更新吗？", "取消更新", MessageBoxButtons.OKCancel);
if (DialogResult.OK == dr)
{
if (ApplicationDeployment.IsNetworkDeployed)
{
ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;
ad.UpdateAsyncCancel();
this.Close();
}
}
}
}
}

参考网址：http://msdn2.microsoft.com/zh-cn/library/system.deployment.application.applicationdeployment(VS.80).aspx