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Expression Column in GridGroupingControl

Currently my dataTable for the mapped column returns a double. My implementation is roughly as follows:
efd.Expression = "[Score]*100";
efd.Name = "ScorePercent";

I get values like 98.4490849790879

I need to implement something like C# method Math.Round() in my GridGroupingControl Expression column.

Is it possible?

Thank you in advance,



2 Replies

ES Eswari S Syncfusion Team April 3, 2014 06:18 AM UTC

Hi Alex,


Thank you for using Syncfusion products.


Your requirement can be achieved by adding custom function to ExpressionFieldEvaluator. Please refer to the following code snippets:


// Add function named Func that uses a delegate named ComputeFunc to define a custom calculation

        ExpressionFieldEvaluator evaluator = this.GridGroupingControl1.TableDescriptor.ExpressionFieldEvaluator;

        evaluator.AddFunction("Func", new ExpressionFieldEvaluator.LibraryFunction(ComputeFunc)); 

        Syncfusion.Web.UI.WebControls.Grid.Grouping.GridExpressionFieldDescriptor efd = new GridExpressionFieldDescriptor();


        // define expression using custom function.

        efd.Expression = "Func([ID]+ 50.9)";

        efd.Name = "ID + 500";



//compute func

  public string ComputeFunc(string s)


        return Math.Round(Convert.ToDecimal(s)).ToString();



For your convenience , we have attached the sample.


Please try this and let us know if you have any queries.



Eswari S

ES Eswari S Syncfusion Team April 3, 2014 06:19 AM UTC

Hi Alex,

Please find sample from the attachment.

Eswari S

Attachment: 122993_407cdccf.zip

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