Problem to Create Custom String Aggregate Function for GridView

[Jignesh Sodvadiya]

Dear All,

I am using Telerik Silverlight UI Control.

Once i has Create Custom Aggegate function for Number Type and Its working Fine but Now I needed String Aggegate function Code are Following.

Code :

  public class RPT_CustomAggregates_Function : EnumerableSelectorAggregateFunction
    {
        protected override string AggregateMethodName
        {
            get
            {
                return "RPT_CustomAggregates";
            }
        }

        protected override Type ExtensionMethodsType
        {
            get
            {
                return typeof(Statistics);
            }
        }
    }

 public static class Statistics
    {
        public static object RPT_CustomAggregates<T>(IEnumerable<T> source, Func<T, object> selector)
        {
            return "Hello";
        }
}

 

This Code give Error on runtime. 

No generic method 'RPT_CustomAggregates' on type 'Report_Config.Statistics' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic.

 Please guide how to resolve this problem.

Thanks,

Jignesh

[Dimitrina]

Hi Jignesh,

You can create a Generic AggregateFunction instead and return the result.

How does this work for you? 

Regards,
Dimitrina
Telerik

[Jignesh Sodvadiya]

Thanks for your Reply.

I want to compare Two Column Total like Cr. and Dr. and According to Diff. Display Diff. Amount with Cr. or Dr. Label.

 

Thanks     

 

[Dimitrina]

Hello Jignesh,

In case the approach illustrated on the demo does not work for you, would it be possible for you to demonstrate the setup you have in a sample project and send it to us? You can open a new support ticket and attach it there.

Regards,
Dimitrina
Telerik

[Jignesh Sodvadiya]

Thanks for your Reply..

 Please find attached Source code.

As per Source.

Dr. Amount Total =36000 and Cr. Amount Total=26000 and that Total displayed in Footer.

After that Cumu. Amount Column Manually calc.

As per Formula

Total Cumu. Amount = 10000 Dr. (36000 Dr. - 10000 Cr.)

 Please reply.

 

Thanks,

Jignesh

 

 

 

 

[Jignesh Sodvadiya]

Please find attached document.

M trying to send source but web site allow (.gif, .jpg, .jpeg, .png ) so I send Screen shot.

 

Thanks,

Jignesh

 

[Dimitrina]

Hello Jignesh,

You can open a new support ticket through the ticketing system and attach it there. 

Regards,
Dimitrina
Telerik

[Jignesh Sodvadiya]

 using System;
using System.Collections.Generic;
using System.Linq;
using Telerik.Windows.Data;

namespace TestProject
{
    public class RadDG_CustomAgg_CR_DR_SUM_Function : EnumerableSelectorAggregateFunction
    {
        protected override string AggregateMethodName
        {
            get
            {
                return "RadDG_CustomAgg_CR_DR_SUM";
            }
        }

        protected override Type ExtensionMethodsType
        {
            get
            {
                return typeof(Aggregates);
            }
        }
    }

    public static class Aggregates
    {
        public static string RadDG_CustomAgg_CR_DR_SUM<TSource>(IEnumerable<TSource> source, Func<TSource, object> selector)
        {
            if (source.Count() == 0)
                return "Test";
            else
                return "Hello";
        }
    }
}

 

 But It gives error at Runtime.

 

Please repl     y.

 

Thanks,

Jignesh

[Dimitrina]

Hello,

I was able to reproduce the issue locally. As alternative solution, I would suggest you the following approach:

public static class Aggregates
{
    public static string RadDG_CustomAgg_CR_DR_SUM<TSource>(IEnumerable<TSource> source, Func<TSource, object> selector)
    {
        if (source.Count() == 0)
            return "Test";
        else
            return "Hello";
    }
}

public class GenericFunction : AggregateFunction<object, string>
{
    public GenericFunction()
    {
        this.AggregationExpression = items => RadDG_CustomAgg_CR_DR_SUM(items);
    }

    private string RadDG_CustomAgg_CR_DR_SUM(IEnumerable<object> source)
    {
        if (source.Count() == 0)
            return "Test";
        else
            return "Hello";
    }
}

Let me know how this works for you.

Regards,
Dimitrina
Telerik

[Jignesh Sodvadiya]

Hi,

I ​check your suggestion and that working Fine.

 

Thanks for your valuable post and suggestion.

 

Thanks,

Jignesh