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New Message on BDOTNET
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From: venkat_kl
Message 3 in Discussion
Hi, If you are working on winforms then, Setting The Value Displayed By the
Windows Forms ProgressBar Control
The .NET Framework gives you several different ways to display a given value
within the <MSHelp:link tabIndex=0
keywords="frlrfSystemWindowsFormsProgressBarClassTopic">ProgressBar</MSHelp:link>
control. Which approach you choose will depend on the task at hand or the
problem you are solving: Set the value of the ProgressBar control directly.
This approach is useful for tasks where you know the total of the item measured
that will be involved, such as reading records from a data source.
Additionally, if you only need to set the value once or twice, this is an easy
way to do it. Finally, use this process if you need to decrease the value
displayed by the progress bar. Increase the ProgressBar display by a fixed
value. This approach is useful when you are displaying a simple count between
the minimum and maximum, such as elapsed time or the number of files that have
been processed out of a known total. Increase the ProgressBar display by a
value that varies. This approach is useful when you need to change the
displayed value a number of times in different amounts. An example would be
showing the amount of hard-disk space being consumed while writing a series of
files to the disk. Setting the ProgressBar Value Directly
The most direct way to set the value displayed by a progress bar is by setting
the <MSHelp:link tabIndex=0
keywords="frlrfSystemWindowsFormsProgressBarClassValueTopic">Value</MSHelp:link>
property. This can be done either at design time or at run time.
To set the ProgressBar value directly Set the ProgressBar control's
<MSHelp:link tabIndex=0
keywords="frlrfSystemWindowsFormsProgressBarClassMinimumTopic">Minimum</MSHelp:link>
and <MSHelp:link tabIndex=0
keywords="frlrfSystemWindowsFormsProgressBarClassMaximumTopic">Maximum</MSHelp:link>
values. In code, set the control's Value property to an integer value
between the minimum and maximum values you have established. Note If you set
the Value property outside the boundaries established by the Minimum and
Maximum properties, the control throws an <MSHelp:link tabIndex=0
keywords="frlrfSystemArgumentExceptionClassTopic">ArgumentException</MSHelp:link>
exception.
The following example illustrates how to set the ProgressBar value directly.
The code reads records from a data source and updates the progress bar and
label every time a data record is read. This example assumes your form has a
Label control, a ProgressBar control, and a data table with a row called
CustomerRow with FirstName and Last Name fields. ' Visual Basic Public Sub
CreateNewRecords() ' Sets the progress bar's Maximum property to ' the
total number of records to be created. ProgressBar1.Maximum = 20 '
Creates a new record in the dataset. ' NOTE: The code below will not
compile, it merely ' illustrates how the progress bar would be used. Dim
anyRow As CustomerRow = DatasetName.ExistingTable.NewRow anyRow.FirstName =
"Stephen" anyRow.LastName = "James" ExistingTable.Rows.Add(anyRow) '
Increases the value displayed by the progress bar. ProgressBar1.Value += 1
' Updates the label to show that a record was read. Label1.Text = "Records
Read = " & ProgressBar1.Value.ToString() End Sub // C# public void
createNewRecords() { // Sets the progress bar's Maximum property to //
the total number of records to be created. progressBar1.Maximum = 20; //
Creates a new record in the dataset. // NOTE: The code below will not
compile, it merely // illustrates how the progress bar would be used.
CustomerRow anyRow = DatasetName.ExistingTable.NewRow(); anyRow.FirstName =
"Stephen"; anyRow.LastName = "James"; ExistingTable.Rows.Add(anyRow);
// Increases the value displayed by the progress bar. progressBar1.Value +=
1; // Updates the label to show that a record was read. label1.Text =
"Records Read = " + progressBar1.Value.ToString(); }Increasing the ProgressBar
Value By a Fixed Interval
If you are displaying progress that proceeds by a fixed interval, you can set
the value and then call a method that increases the ProgressBar control's value
by that interval. This is useful for timers and other scenarios where you are
not measuring progress as a percentage of the whole.
To increase the progress bar by a fixed value
Set the ProgressBar control's Minimum and Maximum values.
Set the control's Step property to an integer representing the amount to
increase the progress bar's displayed value.
Call the PerformStep method to change the value displayed by the amount set in
the Step property.
The following example illustrates how a progress bar can maintain a count of
the files in a copy operation.
In the example below, as each file is read into memory, the progress bar and
label are updated to reflect the total files read. This example assumes your
form has a Label control and a ProgressBar control.
' Visual Basic
Public Sub LoadFiles()
' Sets the progress bar's minimum value to a number representing
' no operations complete -- in this case, no files read.
ProgressBar1.Minimum = 0
' Sets the progress bar's maximum value to a number representing
' all operations complete -- in this case, all five files read.
ProgressBar1.Maximum = 5
' Sets the Step property to amount to increase with each iteration.
' In this case, it will increase by one with every file read.
ProgressBar1.Step = 1 ' Dimensions a counter variable.
Dim i As Integer
' Uses a For...Next loop to iterate through the operations to be
' completed. In this case, five files are to be copied into memory,
' so the loop will execute 5 times.
For i = 0 To 4
' Insert code to copy a file
ProgressBar1.PerformStep()
' Update the label to show that a file was read.
Label1.Text = "# of Files Read = " & ProgressBar1.Value.ToString
Next i
End Sub// C#
public void loadFiles()
{
// Sets the progress bar's minimum value to a number representing
// no operations complete -- in this case, no files read.
progressBar1.Minimum = 0;
// Sets the progress bar's maximum value to a number representing
// all operations complete -- in this case, all five files read.
progressBar1.Maximum = 5;
// Sets the Step property to amount to increase with each iteration.
// In this case, it will increase by one with every file read.
progressBar1.Step = 1; // Uses a for loop to iterate through the
operations to be
// completed. In this case, five files are to be copied into memory,
// so the loop will execute 5 times.
for (int i = 0; i <= 4; i++)
{
// Inserts code to copy a file
progressBar1.PerformStep();
// Updates the label to show that a file was read.
label1.Text = "# of Files Read = " + progressBar1.Value.ToString();
}
}
Increasing the ProgressBar Value By a Variable Amount
Finally, you can increase the value displayed by a progress bar such that each
increase is a unique amount. This is useful when you are keeping track of a
series of unique operations, such as writing files of different sizes to a hard
disk, or measuring progress as a percentage of the whole.
To increase the progress bar by a dynamic value
Set the ProgressBar control's Minimum and Maximum values.
Call the Increment method to change the value displayed by an integer you
specify.
The following example illustrates how a progress bar can calculate how much
disk space has been used during a copy operation. For more information on
determining the current disk space available, see Code: Finding the Amount of
Disk Space Available (Visual Basic).
In the example below, as each file is written to the hard disk, the progress
bar and label are updated to reflect the amount of hard-disk space available.
This example assumes your form has a Label control and a ProgressBar control.
' Visual Basic
Public Sub ReadFiles()
' Sets the progress bar's minimum value to a number
' representing the hard disk space before the files are read in.
' You will most likely have to set this using a system call.
' NOTE: The code below is meant to be an example and
' will not compile.
ProgressBar1.Minimum = AvailableDiskSpace()
' Sets the progress bar's maximum value to a number
' representing the total hard disk space.
' You will most likely have to set this using a system call.
' NOTE: The code below is meant to be an example
' and will not compile.
ProgressBar1.Maximum = TotalDiskSpace() ' Dimension a counter variable.
Dim i As Integer
' Uses a For...Next loop to iterate through the operations to be
' completed. In this case, five files are to be written to the disk,
' so it will execute the loop 5 times.
For i = 1 To 5
' Insert code to read a file into memory and update file size.
' Increases the progress bar's value based on the size of
' the file currently being written.
ProgressBar1.Increment(FileSize)
' Updates the label to show available drive space.
Label1.Text = "Current Disk Space Used = " &_
ProgressBar1.Value.ToString()
Next i
End Sub// C#
public void readFiles()
{
// Sets the progress bar's minimum value to a number
// representing the hard disk space before the files are read in.
// You will most likely have to set this using a system call.
// NOTE: The code below is meant to be an example and
// will not compile.
progressBar1.Minimum = AvailableDiskSpace();
// Sets the progress bar's maximum value to a number
// representing the total hard disk space.
// You will most likely have to set this using a system call.
// NOTE: The code below is meant to be an example
// and will not compile.
progressBar1.Maximum = TotalDiskSpace(); // Uses a for loop to iterate
through the operations to be
// completed. In this case, five files are to be written
// to the disk, so it will execute the loop 5 times.
for (int i = 1; i<= 5; i++)
{
// Insert code to read a file into memory and update file size.
// Increases the progress bar's value based on the size of
// the file currently being written.
progressBar1.Increment(FileSize);
// Updates the label to show available drive space.
label1.Text = "Current Disk Space Used = " +
progressBar1.Value.ToString();
}
}
byevenkat_kl
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