如何让进度条更新得足够快？

Question

我正在使用进度条向用户显示该过程的进度.它有17个步骤,根据天气情况可能需要大约5秒到2到3分钟(好吧,数据库)

我在XP中没有遇到任何问题,进度条没问题,但是在vista中进行测试时我发现情况已经不再如此.

例如:如果它接近5秒,它可能会在消失之前使其成为1/3,因为它已经完成.虽然它的进展是17的17,但它没有显示出来.我相信这是因为动画Vista强加于进度条并且动画无法快速完成.

有谁知道我怎么纠正这个？

这是代码:

这是更新进度条的部分,等待是具有进度条的表单.

        int progress = 1;
        //1 Cash Receipt Items
        waiting.setProgress(progress, 18, progress, "Cash Receipt Items");
        tblCashReceiptsApplyToTableAdapter1.Fill(rentalEaseDataSet1.tblCashReceiptsApplyTo);
        progress++;
        //2 Cash Receipts
        waiting.setProgress(progress, "Cash Receipts");
        tblCashReceiptsTableAdapter1.Fill(rentalEaseDataSet1.tblCashReceipts);
        progress++;
        //3 Checkbook Codes
        waiting.setProgress(progress, "Checkbook Codes");
        tblCheckbookCodeTableAdapter1.Fill(rentalEaseDataSet1.tblCheckbookCode);
        progress++;
        //4 Checkbook Entries
        waiting.setProgress(progress, "Checkbook Entries");
        tblCheckbookEntryTableAdapter1.Fill(rentalEaseDataSet1.tblCheckbookEntry);
        progress++;
        //5 Checkbooks
        waiting.setProgress(progress, "Checkbooks");
        tblCheckbookTableAdapter1.Fill(rentalEaseDataSet1.tblCheckbook);
        progress++;
        //6 Companies
        waiting.setProgress(progress, "Companies");
        tblCompanyTableAdapter1.Fill(rentalEaseDataSet1.tblCompany);
        progress++;
        //7 Expenses
        waiting.setProgress(progress, "Expenses");
        tblExpenseTableAdapter1.Fill(rentalEaseDataSet1.tblExpense);
        progress++;
        //8 Incomes
        waiting.setProgress(progress, "Incomes");
        tblIncomeTableAdapter1.Fill(rentalEaseDataSet1.tblIncome);
        progress++;
        //9 Properties
        waiting.setProgress(progress, "Properties");
        tblPropertyTableAdapter1.Fill(rentalEaseDataSet1.tblProperty);
        progress++;
        //10 Rental Units
        waiting.setProgress(progress, "Rental Units");
        tblRentalUnitTableAdapter1.Fill(rentalEaseDataSet1.tblRentalUnit);
        progress++;
        //11 Tenant Status Values
        waiting.setProgress(progress, "Tenant Status Values");
        tblTenantStatusTableAdapter1.Fill(rentalEaseDataSet1.tblTenantStatus);
        progress++;
        //12 Tenants
        waiting.setProgress(progress, "Tenants");
        tblTenantTableAdapter1.Fill(rentalEaseDataSet1.tblTenant);
        progress++;
        //13 Tenant Transaction Codes
        waiting.setProgress(progress, "Tenant Transaction Codes");
        tblTenantTransCodeTableAdapter1.Fill(rentalEaseDataSet1.tblTenantTransCode);
        progress++;
        //14 Transactions
        waiting.setProgress(progress, "Transactions");
        tblTransactionTableAdapter1.Fill(rentalEaseDataSet1.tblTransaction);
        progress++;
        //15 Vendors
        waiting.setProgress(progress, "Vendors");
        tblVendorTableAdapter1.Fill(rentalEaseDataSet1.tblVendor);
        progress++;
        //16 Work Order Categories
        waiting.setProgress(progress, "Work Order Categories");
        tblWorkOrderCategoryTableAdapter1.Fill(rentalEaseDataSet1.tblWorkOrderCategory);
        progress++;
        //17 Work Orders
        waiting.setProgress(progress, "Work Orders");
        tblWorkOrderTableAdapter1.Fill(rentalEaseDataSet1.tblWorkOrder);
        progress++;
        //18 Stored procs
        waiting.setProgress(progress, "Stored Procedures");
        getAllCheckbookBalancesTableAdapter1.Fill(rentalEaseDataSet1.GetAllCheckbookBalances);
        getAllTenantBalancesTableAdapter1.Fill(rentalEaseDataSet1.GetAllTenantBalances);
        //getCheckbookBalanceTableAdapter1;
        //getTenantBalanceTableAdapter1;
        getTenantStatusID_CurrentTableAdapter1.Fill(rentalEaseDataSet1.GetTenantStatusID_Current);
        getTenantStatusID_FutureTableAdapter1.Fill(rentalEaseDataSet1.GetTenantStatusID_Future);
        getTenantStatusID_PastTableAdapter1.Fill(rentalEaseDataSet1.GetTenantStatusID_Past);
        selectVacantRentalUnitsByIDTableAdapter1.Fill(rentalEaseDataSet1.SelectVacantRentalUnitsByID);
        getRentBasedBalancesTableAdapter1.Fill(rentalEaseDataSet1.GetRentBasedBalances);
        getAgingBalanceTableAdapter2.Fill(rentalEaseDataSet1.GetAgingBalance);


        waiting.Close();

这是等待形式:

public partial class PleaseWaitDialog : Form {
    public PleaseWaitDialog() {
        CheckForIllegalCrossThreadCalls = false;
        InitializeComponent();
    }

    public void setProgress(int current, int max, int min, string loadItem) {
        Debug.Assert(min <= max, "Minimum is bigger than the maximum!");
        Debug.Assert(current >= min, "The current progress is less than the minimum progress!");
        Debug.Assert(current <= max, "The progress is greater than the maximum progress!");

        prgLoad.Minimum = min;
        prgLoad.Maximum = max;
        prgLoad.Value = current;
        lblLoadItem.Text = loadItem;
    }

    public void setProgress(int current, string loadItem) {
        this.setProgress(current, prgLoad.Maximum, prgLoad.Minimum, loadItem);
    }
}

Answer 1

Vista在更新进度条时引入了动画效果 - 它尝试从前一个位置平滑地滚动到新设置的位置,这在控件的更新中产生了令人讨厌的时滞.当您以较大的增量跳过进度条时,滞后最明显,例如在一次跳跃中从25%跳到50%.

正如另一张海报指出的那样,您可以禁用进度条的Vista主题,然后它将模仿XP进度条的行为.

我找到了另一种解决方法:如果你向后设置进度条,它会立即绘制到这个位置.所以,如果你想从25%跳到50%,你会使用(诚然是hackish)逻辑:

progressbar.Value = 50;
progressbar.Value = 49;
progressbar.Value = 50;

我知道,我知道 - 这是一个愚蠢的黑客 - 但它确实有效!

Answer 2

这整个混乱的原因是Vista和W7引入的插值动画效果.它与线程阻塞问题毫无关系.调用setProgress()或driectly设置Value属性会触发动画效果,我将解释如何作弊:

我想出了一个根据固定值设置最大值的黑客.最大属性不会触发效果,因此您可以通过即时响应自由移动进度.

请记住,实际显示的进度由下式给出:ProgressBar.Value/ProgressBar.Maximum.考虑到这一点,下面的例子将把进度从0移到100,由i重新提交:

ProgressBar works like this:  
progress = value / maximum

therefore:
maximum = value / progress

我添加了一些所需的缩放因子,应该是自我解释的:

progressBar1.Maximum *= 100;
progressBar1.Value = progressBar1.Maximum / 100;
for (int i = 1; i < 100; i++)
{
    progressBar1.Maximum = (int)((double)progressBar1.Value / (double)(i + 1) * 100);
    Thread.Sleep(20);
}

Answer 3

尝试调用对该waiting.setProgess()方法的调用，因为waiting似乎存在于另一个线程中，这将是一个经典的跨线程调用（如果您允许，编译器会警告您）。

由于Control.Invoke使用起来有点笨拙，我通常使用扩展方法来传递 lambda 表达式：

waiting.ThreadSafeInvoke(() => waiting.setProgress(...));

。

// also see http://stackoverflow.com/questions/788828/invoke-from-different-thread
public static class ControlExtension
{
    public static void ThreadSafeInvoke(this Control control, MethodInvoker method)
    {
        if (control != null)
        {
            if (control.InvokeRequired)
            {
                control.Invoke(method);
            }
            else
            {
                method.Invoke();
            }
        }
    }
}