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DataBind and Empty Values

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Chart (Obsolete)

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answered on 08 Apr 2008, 11:45 AM

Hello Patrick,

You cannot customize the interpretation of the EmptyValue for RadChart. We are not sure how are you binding the control to a list of pairs, however, Double.NaN is recognized and treated as an empty value out-of-the-box when the control is bound to a simple list:

ASPX

    
            <telerik:RadChart ID="RadChart1" runat="server"> 
        
            </telerik:RadChart>

Code-behind:

    
            List<double> list = new List<double>(); 
        
            list.Add(.2); 
        
            list.Add(Double.NaN); 
        
            list.Add(.8); 
        
            RadChart1.DataSource = list; 
        
            RadChart1.DataBind();

Sincerely yours,
Manuel
the Telerik team

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answered on 08 Apr 2008, 12:57 PM

Hello Manuel,

thank's for your quick reply.
As I wrote, I use a list of custom objects. The pair A/B is built by two properties of the object, wheras one series of the chart contains the values of A, another series contains the values of B. The label is filled from a third property.
But there is no problem with that construction so far. The problem occurs, when one value is double.NaN.

Even your example with the simple List which contains a double.NaN does not work for me. Like before I the system throws the Exception:

Die Eingabezeichenfolge hat das falsche Format. bei System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) bei System.Number.ParseDouble(String value, NumberStyles options, NumberFormatInfo numfmt)
...

The problem seems, that I am using a german locale, so that the result of double.NaN.ToString() is "n. def.". The internal parsing methods of the databind seem to not interprete that correctly.

Sincerely yours,
Patrick