Passing Parameters to Crystal Reports at Runtime

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Introduction

This article describes how to get and set the parameter value from the report:

Example

This example is composed of:

1. A sample report 

2. A form that loads the report automatically and shows the preview report

3. A button that retrieves the parameter's actual value using the method:

   private string GetParamValue (string paramName)
   {
       string tmpValue="";
       for(int i=0;i<ReportDoc.DataDefinition.FormulaFields.Count; i++)
       {
           if(ReportDoc.DataDefinition.FormulaFields[i].FormulaName==
   						"{" + paramName + "}")
           tmpValue= ReportDoc.DataDefinition.FormulaFields[i].Text ;
       }
       return tmpValue;
   }

4. Another button that changes the values of the report using the textbox text:

   private void SetParamValue (string paramName, string paramValue)
   {
       for(int i=0;i<ReportDoc.DataDefinition.FormulaFields.Count; i++)
       if(ReportDoc.DataDefinition.FormulaFields[i].FormulaName==
   					"{" + paramName + "}")
       ReportDoc.DataDefinition.FormulaFields[i].Text = "\"" +paramValue +"\"";
   }