IDataStore.Evaluate<TValue>(string expression, int row) Method

.NET Standard 2.x

Calculates the specified DataWindow expression using the specified row (by the index number) in the primary buffer of the DataStore.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

  public TValue Evaluate<TValue>(string expression, int row);

Type Parameters

TValue

The type of the result value.

Parameters

expression System.String

A DataWindow expression to evaluate.

row System.Int32

Returns

TValue

The result value.

Examples

The following code example demonstrates how to use the Evaluate<TValue>(String, Int32) method.

using DWNet.Data;
using System;

namespace Appeon.ApiDoc.IDataStoreExamples
{
    public class EvaluateExample
    {
        private readonly SchoolContext _context;

        public EvaluateExample(SchoolContext dataContext)
        {
            // Sets the data context
            _context = dataContext;
        }

        public void Example2()
        {
            // Instantiates a DataStore object with dataobject: d_department
            var datastore = new DataStore("d_department", _context);

            datastore.Retrieve();

            // This datastore has 4 records
            // Values of the first record is:
            // Name: Engineering; Budget: 350000.00

            string nameAndBudget = datastore.Evaluate<string>("name +': ' + budget)", 0);

            Console.WriteLine(nameAndBudget);

            /*This code produces the following output:
            
            Engineering: 350000.0000
            */
        }
    }
}

Example Refer To

DataWindow File: d_department

Applies to

.NET Standard

2.x