两个DateTimePickers C＃的水晶报告

问题描述

我有一个包含Crystal Report Viewer的表单，顶部有两个DateTimePickers和button1，当我运行此代码并选择日期并单击按钮时，查看器上只显示coulmns名称的数据。

I have a form which contain the Crystal Report Viewer and on the top there are two DateTimePickers and button1, When I run this code and choose the dates and click on the button, no data appear on the viewer only the coulmns names.

private void button1_Click(object sender, EventArgs e)
       {
           ByName cryrpt = new ByName();
           cryrpt.Load(@"C:*******************ByName.rpt");
           ParameterFields pfields = new ParameterFields();
           ParameterField pfield = new ParameterField();
           ParameterDiscreteValue pdisc = new ParameterDiscreteValue();
           ParameterField pfield1 = new ParameterField();
           ParameterDiscreteValue pdisc1 = new ParameterDiscreteValue();

           pfield.Name = "start_Date";
           pdisc.Value = FirstDate;
           pfield.CurrentValues.Add(pdisc);
           pfields.Add(pfield);


           pfield1.Name = "End_Date";
           pdisc1.Value = SecondDate;
           pfield1.CurrentValues.Add(pdisc1);
           pfields.Add(pfield1);
           crystalReportViewer1.ReportSource = cryrpt;
           crystalReportViewer1.ParameterFieldInfo = pfields;
           FirstDate = dateTimePicker1.Value;
           SecondDate = dateTimePicker2.Value;
           crystalReportViewer1.ReportSource = cryrpt;
           crystalReportViewer1.Refresh();
       }

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