如何将reportparameter添加到localreport，然后在rdlc报告（文本框）中引用它

using (LocalReport reportEngine = reportViewer1.LocalReport)                
                {       this.Instrument_ReadingsTableAdapter.Fill(this.LiveDataSetFromActualDB.Instrument_Readings);                 
                    reportEngine.ReportPath = Application.StartupPath + "\\Report1.rdlc";
                    //reportEngine.ReportPath = Application.StartupPath + "\\Report2.rdlc";
                    
                    // -- NEW CODE ADDED HERE
                    //ReportDataSource rds = new ReportDataSource();
                    //rds.Name = "Datasettest";
                    //rds

                    var dt_min = this.Instrument_ReadingsTableAdapter.Min();
                    var dt_max = this.Instrument_ReadingsTableAdapter.Max();

                    if (!dt_min.HasValue || !dt_max.HasValue)
                    {
                        return;
                    }

                    var diff = (dt_max.Value - dt_min.Value).TotalMinutes;

                    this.reportViewer1.LocalReport.ReportEmbeddedResource = "Report1.rdlc";

                    ReportParameter rp = new ReportParameter("Time_Span", diff.ToString());
                    reportEngine.SetParameters(new ReportParameter[] { rp });
                    this.reportViewer1.RefreshReport();

我尝试了什么：



我收到错误

Microsoft.reporting.WinForms.LocalReport.InternalGetReportParameters（ CatalogItemContextBase reportContext，NameValueCollection userSpecifiedValues，ParameterInfoCollection baseLineParameters，DatasourceCredentialsCollection credentials，ReportRuntimeSetup reportRuntimeSetup at Microsoft.Reporting.Winforms.LocalReport.SetParameters（IEnumerable1 parameters）

at

Live_AM_Report.Form1.Form1_Load （对象发送者，EventArgs e）

...第255行，其中= reportEngine.SetParameters（new ReportParameter [] {rp}）;



在rdlc的设计方面



我在报告数据中添加了一个名为Timespan的参数

我还添加了引用参数的文本框，现在是设置该pa值的简单情况rameter，文本框应该调用它。

文本框的值字段= [@Time_Span]（我添加的参数）



我有现在已经挣扎了好几天，而且非常令人沮丧，任何帮助都会非常感激。

What I have tried:

I recieve an error
"Microsoft.reporting.WinForms.LocalReport.InternalGetReportParameters(CatalogItemContextBase reportContext, NameValueCollection userSpecifiedValues, ParameterInfoCollection baseLineParameters, DatasourceCredentialsCollection credentials, ReportRuntimeSetup reportRuntimeSetup at Microsoft.Reporting.Winforms.LocalReport.SetParameters(IEnumerable1 parameters)
at
Live_AM_Report.Form1.Form1_Load(Object sender, EventArgs e)
... line 255 , which = reportEngine.SetParameters(new ReportParameter[] { rp });

On the design side of the rdlc

I have added a parameter called Timespan in the "Report data"
I also added the textbox that refers to the parameter, now its a simple case of setting the value in that parameter, and the textbox should call it.
The Textbox's Value field = [@Time_Span] (The parameter i added)

I have struggled with this for a few days now, and its really frustrating, any help would be greatly appreciated.