在水晶报告中传递参数

Question

我正在从存储过程创建crytal报告,当我传递一个参数但它显示错误时,这工作正常

"不正确的参数"

当我传递两个参数我的代码是

 {
    ReportDocument reportDocument = new ReportDocument();
    ParameterField paramField = new ParameterField();
    ParameterFields paramFields = new ParameterFields();
    ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();

    paramField.Name = "@Dept";
    paramDiscreteValue.Value = TextBox1.Text.ToString();
    paramField.CurrentValues.Add(paramDiscreteValue);
    paramFields.Add(paramField);

    paramField.Name = "@Name";
    paramDiscreteValue.Value = TextBox2.Text.ToString();
    paramField.CurrentValues.Add(paramDiscreteValue);
    paramFields.Add(paramField);

    CrystalReportViewer1.ParameterFieldInfo = paramFields;
    reportDocument.Load(Server.MapPath("CrystalReport.rpt"));
    CrystalReportViewer1.ReportSource = reportDocument;
    reportDocument.SetDatabaseLogon("sa", "sa", "OPWFMS-7KYGZ7SB", "test");

}

请让我知道任何变化

Answer 1

您需要为这两个参数创建新的parameterField和value.您当前的代码添加参数,修改它(更改名称和值)并再次添加相同的对象.这应该是正确的:

 {
ReportDocument reportDocument = new ReportDocument();

ParameterFields paramFields = new ParameterFields();
// ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();

ParameterField paramField = new ParameterField();
ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();
paramField.Name = "@Dept";
paramDiscreteValue.Value = TextBox1.Text.ToString();
paramField.CurrentValues.Add(paramDiscreteValue);
paramFields.Add(paramField);

paramField = new ParameterField(); // <-- This line is added
paramDiscreteValue = new ParameterDiscreteValue();  // <-- This line is added
paramField.Name = "@Name";
paramDiscreteValue.Value = TextBox2.Text.ToString();
paramField.CurrentValues.Add(paramDiscreteValue);
paramFields.Add(paramField);

CrystalReportViewer1.ParameterFieldInfo = paramFields;
reportDocument.Load(Server.MapPath("CrystalReport.rpt"));
CrystalReportViewer1.ReportSource = reportDocument;
reportDocument.SetDatabaseLogon("sa", "sa", "OPWFMS-7KYGZ7SB", "test");

}

编辑: 注释中提到的错误可能是因为代码中有两个变量paramField或paramDiscreteValue的定义.在一个c#方法中,您不能多次定义具有相同名称的变量.尝试编写上面的代码,如果仍然遇到编译器错误,请在此处粘贴完整的错误文本.

Answer 2

试试这个更简洁

{    
  ReportDocument reportDocument = new ReportDocument();

  reportDocument.Load(Server.MapPath("CrystalReport.rpt"));
  CrystalReportViewer1.ReportSource = reportDocument;
  reportDocument.SetParameterValue("@Dept", TextBox1.Text.ToString());    
  reportDocument.SetParameterValue("@Name", TextBox2.Text.ToString());

 // CrystalReportViewer1.ParameterFieldInfo = paramFields;

  reportDocument.SetDatabaseLogon("sa", "sa", "OPWFMS-7KYGZ7SB", "test");
}

Answer 3

确保参数中传递的实际数据不会隐式转换为错误的数据类型。就像您为 @Dept 参数传递数字 ID 一样，请确保期望接收该值的输入参数的数据类型也是数字类型。