属性值在另一个事件中重置

时间:2010-11-30 03:43:06

标签: c# activereports

我在使格式化正确发生方面遇到了一些麻烦。我认为这源于对我试图改变的事件的错误理解。

任何方向都会很棒

    private void so_FetchData(object sender, FetchEventArgs eArgs)
    {
        if (m_so != null && m_so.Rows.Count > (m_soRowCount + 1))
        {
            DataRow soDr = m_so.Rows[m_soRowCount++];
            if (soDr != null)
            {
                var compResID = (int) soDr["CompResID"];
                var result = (ComplianceLevel) soDr["Result"];
                var sectNum = (int) soDr["JobSectType"];
                var sectName = soDr["S" + sectNum + "Name"] as string;
                var sectTxt = soDr["S" + sectNum + "Text"] as string;

                Fields["CompLev"].Value = (result == ComplianceLevel.OtherThanSerious) ? "Other Than Serious" : result.ToString();

                m_sectInfo = new SectInfo(sectName, sectTxt);
                m_causes = new Causes(compResID);
                m_actions = new Actions(compResID);
                subReport1.Report = m_sectInfo;
                subReport2.Report = m_causes;
                subReport3.Report = m_actions;
                eArgs.EOF = false;
            }
        }
        else
        {
            eArgs.EOF = true;
        }
    }

    private void eh_BeforePrint(object sender, EventArgs e)
    {
        //decide where the bottom border should be draw to
        if (m_actions != null && m_actions.ShouldShowBottBorder)
        {
            subReport3.Border.BottomStyle = BorderLineStyle.ThickSolid;
            subReport2.Border.BottomStyle = BorderLineStyle.Solid;
        }
        else if (m_causes != null && m_causes.ShouldShowBottBorder)
        {
            subReport2.Border.BottomStyle = BorderLineStyle.ThickSolid;
        }
        else
        {
            subReport1.Border.BottomStyle = BorderLineStyle.ThickSolid;
        }
    }

问题在于,每次单步执行eh_BeforePrint方法时,即使我单步执行子报表并且值已正确设置,值也始终等于false。是什么导致bool属性重置为false?

如果要在每个子报告的Fetch_Data方法中打印任何记录,只需更改它。

    private void Causes_FetchData(object sender, FetchEventArgs eArgs)
    {
        if (m_pos < m_corrs.Count)
        {
            if (!ShouldShowBottBorder)
                ShouldShowBottBorder = true;
            //...
         } 
     }

1 个答案:

答案 0 :(得分:2)

在相应的FetchData事件之后,您无法确定BeforePrint事件是否完全引发。例如,对于多个记录,FetchData可能会多次触发,但由于某些逻辑在布局引擎中保持在一起,因此在ActiveReports知道它将提交一个部分的页面之前,它可能需要几个记录。因此,在引发相应的BeforePrint事件之前,为几个事件引发FetchData是很常见的。

如果我正确理解你的代码,那么问题就更大了。您似乎正在计算子报表中的值(m_causes和m_actions似乎是实际的子报表)。如果是这种情况,则无法可靠地计算子报表中的值并将其传递给父报表。相反,您需要在父报告中计算这些值。但是,通常可以添加一些共享函数来计算值并从父报表中调用它,然后将该值传递到子报表中。

如果您对此有具体问题,请在此处查看更多信息。

如果您更改了初始化子报表的方式,那么在不相关的注释中,您可以获得非常显着的性能提升。始终在ReportStart事件中初始化子报表,然后在包含子报表控件的部分的格式事件中设置其数据。这样,您可以初始化每个子报表一次,而不是为每个记录初始化每个子库。例如:

private void so_ReportStart()
{
    subreport1.Report = new SectInfo();
    subreport2.Report = new Causes();
    subreport3.Report = new Actions();
}
private void Detail_Format()
{ // assuming Detail is the section containing your subreports:

    ((SectInfo)subreport1.Report).SetParameters(Fields["sectName"].Value, Fields["sectTxt"].Value);
    ((Causes)subreport2.Report).SetParameters(Fields["compResID"].Value);
    ((Actions)subreport3.Report).SetParameters(Fields["compResID"].Value);
}

您可以在FetchData中设置这些“字段”值,类似于现在初始化子报表的方式。如下所示:

private void so_FetchData(object sender, FetchEventArgs eArgs)
{
    if (m_so != null && m_so.Rows.Count > (m_soRowCount + 1))
    {
        DataRow soDr = m_so.Rows[m_soRowCount++];
        if (soDr != null)
        {
            var compResID = (int) soDr["CompResID"];
            var result = (ComplianceLevel) soDr["Result"];
            var sectNum = (int) soDr["JobSectType"];
            var sectName = soDr["S" + sectNum + "Name"] as string;
            var sectTxt = soDr["S" + sectNum + "Text"] as string;

            Fields["CompLev"].Value = (result == ComplianceLevel.OtherThanSerious) ? "Other Than Serious" : result.ToString();
            /** BEGIN NEW CODE **/
            Fields["sectName"].Value = sectName;
            Fields["sectTxt"].Value = sectTxt;
            Fields["compResID"].Value = compResId;
            /** END NEW CODE **/

            /** OLD CODE:
            m_sectInfo = new SectInfo(sectName, sectTxt);
            m_causes = new Causes(compResID);
            m_actions = new Actions(compResID);
            subReport1.Report = m_sectInfo;
            subReport2.Report = m_causes;
            subReport3.Report = m_actions;
            **/     
            eArgs.EOF = false;
        }
    }
    else
    {
        eArgs.EOF = true;
    }
}

要了解有关ActiveReports中事件的更多信息,请参阅the Report Events concepts topic in the ActiveReports Online Help。 要了解有关将数据传递到子报告的详细信息,请参阅Subreports with Run-Time Data Sources in the ActiveReports Online Help

Scott Willeke
GrapeCity inc.