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很好用

“参数不正确”

当我传递两个参数时我的代码是

 {
    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");

}

修改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未被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。

Answer 4

尝试在添加到报告的每个参数之前创建ParameterField：

paramField = new ParameterField();
paramDiscreteValue.Value = ...
...

Answer 5

可以使用Crystal Reports for Visual Studio 2005复制该问题。解决方法修复方法是首先设置CrystalReportViewer的ReportSource，然后设置参数值。因此，您的代码应该是：

{
ReportDocument reportDocument = new ReportDocument();

CrystalReportViewer1.ReportSource = 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"));
reportDocument.SetDatabaseLogon("sa", "sa", "OPWFMS-7KYGZ7SB", "test");
}

在水晶报告中传递参数

5 个答案: