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抱歉，您遇到了這樣一個小問題，但我找不到解決方案。我創建了一個用於從交換服務器和Form獲取附件的類，用於添加我參加的用於日誌輸出的服務器配置和文本框。我添加了backgroundWorker來創建單獨的線程，當類獲得正確的附件並收集輸出信息時，它會重定向到backgroundWorker DoWork方法。問題是，文本框的UI是根本不想將文本追加使用後臺工作人員將文本追加到另一個班級的文本框中
類下載附件的樣子：
namespace DownloadAttachmentExchange
{
class ExchangeDwnClass
{
private string path_ = "";
private string filterSender_ = "";
private string subject_ = "";
private string id_ = "";
private string username_ = "";
private string password_ = "";
private string exchange_ = "";
private string filterExcel_ = "";
private string filterCSV_ = "";
private string attachmentName_ = "";
private int emailFetch_ = 0;
private DateTime current_;
ExchangeService serv = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
public string Path
{
get { return path_; }
set { path_ = value; }
}
public string FilterSender
{
get { return filterSender_; }
set { filterSender_ = value; }
}
public string Subject
{
get { return subject_; }
set { subject_ = value; }
}
public string ID
{
get { return id_; }
set { id_ = value; }
}
public string Username
{
get { return username_; }
set { username_ = value; }
}
public string Password
{
get { return password_; }
set { password_ = value; }
}
public string Exchange
{
get { return exchange_; }
set { exchange_ = value; }
}
public string FilterExcel
{
get { return filterExcel_; }
set { filterExcel_ = value; }
}
public string FilterCsv
{
get { return filterCSV_; }
set { filterCSV_ = value; }
}
public string AttachementName
{
get { return attachmentName_; }
set { attachmentName_ = value; }
}
public int EmailFetch
{
get { return emailFetch_; }
set { emailFetch_ = value; }
}
public DateTime CurrentDate
{
get { return current_; }
set { current_ = value; }
}
public void GetAttachments()
{
try
{
serv.Credentials = new WebCredentials(Username, Password);
serv.AutodiscoverUrl(Exchange);
ItemView view = new ItemView(10);
FindItemsResults<Item> result = serv.FindItems(WellKnownFolderName.Inbox, new ItemView(EmailFetch));
if (result != null && result.Items != null && result.Items.Count > 0)
{
foreach (Item item in result.Items)
{
EmailMessage msg = EmailMessage.Bind(serv, item.Id, new PropertySet(BasePropertySet.IdOnly, ItemSchema.Attachments, ItemSchema.HasAttachments, EmailMessageSchema.From, EmailMessageSchema.Sender));
if (msg.Sender.ToString().Contains(FilterSender) && msg.From.ToString().Contains(FilterSender))
{
foreach (Attachment att in msg.Attachments)
{
if (att is FileAttachment)
{
FileAttachment file = att as FileAttachment;
if (file.Name.Contains(FilterExcel) || file.Name.Contains(FilterCsv))
{
Form1 form = new Form1();
file.Load(Path +"\\"+ file.Name);
AttachementName = file.Name.ToString();
Subject = item.Subject.ToString();
ID = item.Id.ToString();
CurrentDate = DateTime.Now;
form.date = CurrentDate.ToString();
form.subject = Subject;
form.attachment = AttachementName;
form.backgroundWorker1.RunWorkerAsync();
Thread.Sleep(60000);
}
}
}
}
//item.Delete(DeleteMode.HardDelete);
}
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Console.ReadLine();
}
public void StopDownloadingAttachment()
{
}
}
}
形式如下：
namespace DownloadAttachmentExchange
{
public partial class Form1 : Form
{
private string path = "";
public string date = "";
public string attachment = "";
public string subject = "";
public Form1()
{
InitializeComponent();
}
ExchangeDwnClass exchange = new ExchangeDwnClass();
private void button3_Click(object sender, EventArgs e)
{
if(folderBrowserDialog1.ShowDialog(this)== DialogResult.OK)
{
path = folderBrowserDialog1.SelectedPath;
exchange.Path = path;
pathTxt.Text = path;
}
}
private void onBtn_Click(object sender, EventArgs e)
{
exchange.Username = userTxt.Text;
exchange.Password = passwdTxt.Text;
exchange.FilterSender = fromFilterTxt.Text;
exchange.EmailFetch = Convert.ToInt32(fetchUpDown.Value);
exchange.Exchange = exchangeTxt.Text;
exchange.GetAttachments();
}
private void filterExcelCheck_CheckedChanged(object sender, EventArgs e)
{
if (filterExcelCheck.CheckState == CheckState.Checked)
{
exchange.FilterExcel = ".xlsx";
}
else
{
exchange.FilterExcel = "";
}
}
private void filterCSVCheck_CheckedChanged(object sender, EventArgs e)
{
if (filterCSVCheck.CheckState == CheckState.Checked)
{
exchange.FilterCsv = ".csv";
}
else
{
exchange.FilterCsv = "";
}
}
private void exchangeTxt_MouseHover(object sender, EventArgs e)
{
tipLbl.Visible = true;
tipLbl.Text = "It is usually same as email address...";
}
private void exchangeTxt_MouseLeave(object sender, EventArgs e)
{
tipLbl.Visible = false;
}
//("\n" + CurrentDate.ToString() + " , Message id: " + ID + " , Message subject: " + Subject + " , Attachment name: " + AttachementName + "\r");
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
//e.Result = "\n" + date + " , Message subject: " + subject + " , Attachment name: " + attachment + "\r";
logOutputTxt.Text = "\n" + date + " , Message subject: " + subject + " , Attachment name: " + attachment + "\r";
//backgroundWorker1.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;
}
//private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
//{
// if (e.Cancelled)
// {
// logOutputTxt.Text = "Thread is somehow cancelled, please contact developer for this issue...!";
// }
// else if (e.Error != null)
// {
// logOutputTxt.Text = e.Error.Message;
// }
// else
// {
// logOutputTxt.Text += e.Result;
// }
//}
}
}
，你可以看到我打電話從類ExchangeDwnClass的後臺工作，我相信是好的，通過使用：
form.backgroundWorke r1.RunWorkerAsync（）;
，當我運行調試器真的跳到後臺工作
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
logOutputTxt.Text = "\n" + date + " , Message subject: " + subject + " , Attachment name: " + attachment + "\r";
//backgroundWorker1.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;
}
出於某種原因表TextBox控件不刷新輸出。 p.s.我也創建了RunWorkerCompleted方法，但也沒有運氣...
任何線索我該如何解決問題？
你不能從這樣的後臺線程更新UI控件。你將需要使用'Control.Invoke'來更新你的'TextBox'。 – 2014-09-27 11:31:15
嗨Yuval，你能舉一些例子嗎？ – dovla091 2014-09-27 11:38:16
只需搜索它：**「從另一個線程更新GUI控件」** – 2014-09-27 11:38:43