C# 如何从windows phone 7应用程序发送电子邮件

在我的WindowsPhone7应用程序中，我想发送一封电子邮件，邮件正文应该包含上一页的数据

private void Email_Send(object sender, RoutedEventArgs e)
{
EmailComposeTask emailComposeTask = new EmailComposeTask();

emailComposeTask.Subject = "message subject";
emailComposeTask.Body = "message body";
emailComposeTask.To = "recipient@example.com";
emailComposeTask.Cc = "cc@example.com";
emailComposeTask.Bcc = "bcc@example.com";
emailComposeTask.Show();
}

现在，在主体部分，我希望我的数据来自上一页。那么如何做到这一点呢

if (this.NavigationContext.QueryString.ContainsKey("school_name"))
{
//if it is available, get parameter value
school = NavigationContext.QueryString["school_name"];
school.Text = date;
}

请告诉我如何传递值

尝试以下操作：

emailComposeTask.Body=+学校

试试这个

private void Email_Send(object sender, RoutedEventArgs e)
{
string previousValue = string.empty;
if (NavigationContext.QueryString.ContainsKey("school_name"))
      previousValue = NavigationContext.QueryString["school_name"];
EmailComposeTask emailComposeTask = new EmailComposeTask();
emailComposeTask.Subject = "message subject";
emailComposeTask.To = "recipient@example.com";
emailComposeTask.Cc = "cc@example.com";
emailComposeTask.Bcc = "bcc@example.com";
emailComposeTask.Body = previousValue ;
emailComposeTask.Show();
}