在c#中动态生成水晶报表时，动态添加sort

代码

private   void  SetSortQuick(ReportClientDocument objRPT)
    {
       if  ( ! String.IsNullOrEmpty( this .SortField))
      {
        cCreateReport objCreateReport  =   new  cCreateReport();
         string [] arrySortField  =   this .SortField.Split( new   char [] {  ' , '  });
         string [] arrySortDirection  =   this .SortDirection.Split( new   char [] {  ' , '  });
         for  ( int  i  =   0 ; i  <  arrySortField.Length; i ++ )
        {
           string [] arryTemp  =  arrySortField[i].Split( new   char [] {  ' | '  });
           string  strFieldName  =  arryTemp[ 0 ];
           string  strFieldType  =  arryTemp[ 1 ].ToLower();

           string  strFormula  =   "" , strFormulaName  =   "" ;
           switch (strFieldType)
          {
             case   " datetime " :
              strFormula  =   " date({ "   +  arrySortField[i]  +   " }) " ;
               break ;
             case   " numeric " :
             case   " int " :
             case   " money " :
             case   " float " :
              strFormula  =   " ToNumber({ "   +  arrySortField[i]  +   " }) " ;
               break ;
             default :
              strFormula  =   " { "   +  arrySortField[i]  +   " } " ;
               break ;
          }
          strFormulaName  =   " Order "   +  i.ToString();

          objRPT.DataDefController.FormulaFieldController.AddByName(strFormulaName, strFormula, CrFormulaSyntaxEnum.crFormulaSyntaxCrystal);
          ISCRField objS  =  objRPT.DataDefController.FindFieldByFormulaForm( " {@ " + strFormulaName + " } " );

           if  (objRPT.DataDefController.SortController.CanSortOn(objS))
          {
            SortClass objSort  =   new  SortClass();
            objSort.SortField  =  objS;
             int  countOfSort  =  objRPT.DataDefinition.Sorts.Count;
             if  (arrySortDirection[i]  ==   " 1 " )
            {
              objSort.Direction  =  CrSortDirectionEnum.crSortDirectionDescendingOrder;
            }
             else
            {
              objSort.Direction  =  CrSortDirectionEnum.crSortDirectionAscendingOrder;
            }
            objRPT.DataDefController.SortController.Add(countOfSort, objSort);
          }
        }
      }
    }

必须使用这种方式才可以动态添加公式为排序字段

 objRPT.DataDefController.FormulaFieldController.AddByName(strFormulaName, strFormula, CrFormulaSyntaxEnum.crFormulaSyntaxCrystal);
 ISCRField objS = objRPT.DataDefController.FindFieldByFormulaForm("{@"+strFormulaName+"}");

我试图使用如下方式动态添加公式字段，但是用CanSortOn检测总是不能作为sort字段。

代码

  public   void  AddFormula(ReportClientDocument oReportClientDocument,
                 string  szName,
                 string  szFormula,
                CrFieldValueTypeEnum crFieldValueType
                )
    {
      FormulaField oFormulaField;

      oFormulaField  =   new  FormulaField();

      oFormulaField.Name  =  szName;
      oFormulaField.Text  =  szFormula;
      oFormulaField.Syntax  =  CrFormulaSyntaxEnum.crFormulaSyntaxCrystal;
      oFormulaField.Type  =  crFieldValueType;

      oReportClientDocument.DataDefController.FormulaFieldController.Add(oFormulaField);
    }

代码

     public  FormulaField FindFormulaField(ReportClientDocument oReportClientDocument,  string  szFormula)
    {
      FormulaField oFormulaField;
      Fields oFields;
       int  iIndex;
      oFormulaField  =   new  FormulaFieldClass();

      oFields  =  oReportClientDocument.DataDefinition.FormulaFields;
      iIndex  =  oFields.Find(szFormula, CrFieldDisplayNameTypeEnum.crFieldDisplayNameName, CeLocale.ceLocaleUserDefault);
      oFormulaField  =  ((FormulaField)oFields[iIndex]);

       return  oFormulaField;
    }

后来我发现找到的公式字段的IsRecurring属性是false.只有这个属性为true时才可以作为sort的字段。

 上面的方法就可以。不知道这是为什么。