Introduction
In an application containing the ReportViewer
control, I have had the following two problems:
- When the
ReportViewer
is rendering, trying to close the Parent Form of the ReportViewer
may cause the application to crash. - There is no straight way to copy the report data to the Clipboard.
Description
Rendering Problem
If there are many pages in a report, it takes a few seconds to render. In this case, if the user wants to cancel report rendering and closes the Form
containing the ReportViewer
control, the application will crash. To solve this problem, I used the RenderingBegin
and RenderingComplete
events of the ReportViewer
and the FormClosing
event of the Parent Form.
To see how the problem occurred, consider the included source files. After running the project, there are nineteen pages in the report. (32 pages in the print layout mode). By clicking the 'Print Layout' button, the report begins rendering. While the report is rendering, if the user closes the Parent Form, the application will crash (if we comment added event handlers).
Copy to the Clipboard
In a report, there is no straight way to copy the report data to the Clipboard. The only way that is available is using the Hyperlink
event of the ReportViewer
control (There is a related article by Teo Lachev at this link). To do this, we should set some attributes at design time:
-
Suppose that there is a 'table
' item on the report file. Select each TextBox
from the 'Table Details' row.
-
Go to the Properties -> Navigation -> 'Hyperlink action' -> 'Jump to URL'.
-
In the following ComboBox
, write '= "NoLink:" & Fields!FieldName.Value
'. (Replace FieldName
with the name of field.)
Using the Code
For the rendering problem, a variable named IsRendering
is defined. In the RenderingBegin
, we set IsRendering = false
. While report is rendering, it prevents closing the form by user. The code is as below:
<summary></summary>
bool IsRendering = false;
<summary>
private void ReportForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (IsRendering) e.Cancel = true;
}
<summary>
private void reportViewer1_RenderingBegin(object sender, CancelEventArgs e)
{
IsRendering = true;
}
<summary>
private void reportViewer1_RenderingComplete(object sender,
RenderingCompleteEventArgs e)
{
IsRendering = false;
}
For the copy problem, after setting the required attributes at design time, we write the below code in the reportViewer1_Hyperlink
event handler:
<summary>
private void reportViewer1_Hyperlink(object sender, HyperlinkEventArgs e)
{
Uri uri = new Uri(e.Hyperlink);
if (uri.Scheme.ToLower() == "nolink")
{
e.Cancel = true;
Clipboard.Clear();
Clipboard.SetText(uri.AbsolutePath);
}
}
History
- 3rd January, 2007: Initial version
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