IDataStoreBase.Validate(Out List<ValidationResult> validationResults) Method

.NET Standard 2.x

Verifies the data using the data validation rules set in the DataStore, and outputs the verification results.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Syntax

  public bool Validate(out List<ValidationResult> validationResults);

Parameters

validationResults System.Collections.Generic.List<System.ComponentModel.DataAnnotations.ValidationResult>

A list of validation results.

Returns

System.Boolean

Returns true if all data meet the validation rule; false if any data does not meet the validation rule.

Examples

The following code example specifies the validation rule (budget > 0), and then modifies one of the budget values to a negative value. The Validate method will display the error message for the data that does not meet the rule.

using DWNet.Data;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace Appeon.ApiDoc.IDataStoreBaseExamples
{
    public class ValidateExample
    {
        private readonly SchoolContext _context;

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

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

            // Retrieves rows from the database for datastore.
            datastore.Retrieve();

            // Sets the validation rule with the third column: value for budget must be 
            // greater than 0.
            datastore.SetValidate("budget", "budget > 0");

            // Sets the vaue for budget in row 1 to -350000.
            datastore.SetItem(0, "budget", -350000m);

            // If all data passes validation, commit data to database,
            // otherwise, display an error.
            bool valid = datastore.Validate(out List<ValidationResult> results);

            if (valid)
            {
                datastore.Update();
            }
            else
            {
                foreach (var validationResult in results)
                {
                    Console.WriteLine("Error Message: {0}",
                                      validationResult.ErrorMessage);
                }
            }

            /*This code produces the following output:
            
            Error Message: Row 0 column Budget data validation failed.
            */
        }
    }
}

Example Refer To

Model Class: D_Department
DataWindow File: d_department

Applies to

.NET Standard

2.x