change label text while Winform is open [closed]

问题

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Closed 6 years ago.

I am trying to Change the text of a Label after it is shown in a Progressbar, i want to Show the number of files that are being uploaded, and the number that has been so far.

i have created a ProgressBar winform, and my (beginner) plan was to do it like this:

public StatusUpload(String saved)
    {
        InitializeComponent();
        timer1.Start();
        timer1.Enabled = true;
        AmountSaved.Text = saved;
    }

but when i try to Change it from another class, i can only define it in the beginning

StatusUpload Progressbar = new StatusUpload("Total Saved: 0/" + selection.Count);

and can't Change it afterwards anymore, what should i do? (i want to Change it later during the Loop so i can write 1/2, and then after the final Loop 2/2)

回答1:

If you are doing a big workload in the background. I would advise using a Background Worker :http://msdn.microsoft.com/de-de/library/system.componentmodel.backgroundworker.aspx

You generate the Backgroundworker when you want to upload your data. Then you subscribe to the Events:

public event DoWorkEventHandler DoWork

Put your uploading code here. After i.e. you finished 1/2 files you call ReportProgress(1);

   public event ProgressChangedEventHandler ProgressChanged

This is thrown if you call ReportProgress(); . Then you update your Progressbar with:

this.yourProgressBar.Value = e.ProgressPercentage;

}

public event RunWorkerCompletedEventHandler RunWorkerCompleted

is the event which is thrown after you finished your work.

来源：https://stackoverflow.com/questions/16750498/change-label-text-while-winform-is-open