加载Crystal Report时显示参数提示

Question

Crystal报表在报表加载时显示参数提示。

加载报告的我的代码是： -

TableLogOnInfo logOnInfo = new TableLogOnInfo();

                logOnInfo.ConnectionInfo.ServerName = System.Configuration.ConfigurationManager.AppSettings["ServerName"];
                logOnInfo.ConnectionInfo.DatabaseName = System.Configuration.ConfigurationManager.AppSettings["DBName"];
                logOnInfo.ConnectionInfo.IntegratedSecurity = false;
                logOnInfo.ConnectionInfo.UserID = System.Configuration.ConfigurationManager.AppSettings["UID"];
                logOnInfo.ConnectionInfo.Password = System.Configuration.ConfigurationManager.AppSettings["PWD"];

                foreach (CrystalDecisions.CrystalReports.Engine.Table tbl in SchoolExpenseReport.ReportDocument.Database.Tables)
                    tbl.ApplyLogOnInfo(logOnInfo);

                ParameterValues pvSchoolExpense = new ParameterValues();
                ParameterDiscreteValue pdvFomDate = new ParameterDiscreteValue();
                ParameterDiscreteValue pdvToDate = new ParameterDiscreteValue();

                pdvFomDate.Value = txtFromDate.Text;
                pdvToDate.Value = txtToDate.Text;

                SchoolExpenseReport.ReportDocument.DataDefinition.ParameterFields["FromDate"].CurrentValues.Clear();
                pvSchoolExpense.Add(pdvFomDate);
                SchoolExpenseReport.ReportDocument.DataDefinition.ParameterFields["FromDate"].ApplyCurrentValues(pvSchoolExpense);

                SchoolExpenseReport.ReportDocument.DataDefinition.ParameterFields["ToDate"].CurrentValues.Clear();
                pvSchoolExpense.Add(pdvToDate);
                SchoolExpenseReport.ReportDocument.DataDefinition.ParameterFields["ToDate"].ApplyCurrentValues(pvSchoolExpense);

                SchoolExpenseReportViewer.ReportSource = SchoolExpenseReport;
                SchoolExpenseReportViewer.DataBind();
                SchoolExpenseReportViewer.RefreshReport();
                SchoolExpenseReport.Visible = true;

显示参数提示，如下所示

Answer 1

我不太熟悉添加这样的参数。我通常使用.SetParameterValue()。

当我将日期设置为参数值时，它们通常采用DateTime格式，但我看到您只是分配字符串值。

尝试更改此内容：

pdvFomDate.Value = txtFromDate.Text;
pdvToDate.Value = txtToDate.Text;

对此（根据TextBox中的日期更改格式字符串）：

pdvFomDate.Value = DateTime.ParseExact(txtFromDate.Text, "MM/dd/yyyy");
pdvToDate.Value = DateTime.ParseExact(txtToDate.Text, "MM/dd/yyyy");

FWIW，我考虑使用日期选择器控件而不是文本框来接受用户的日期值。

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如果这不起作用，请尝试使用此备用语法来设置参数值：

var fromDate = DateTime.ParseExact(txtFromDate.Text, "MM/dd/yyyy");

SchoolExpenseReport.ReportDocument.SetParameterValue("FromDate", fromDate);