VariableChooser.cs

using Microsoft.SqlServer.Dts.Runtime;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
#if LINQ_SUPPORTED
using System.Linq;
#endif

namespace com.webkingsoft.JSONSource_Common
{
    public partial class VariableChooser : Form
    {
        private Variables _vars;
        private Variable _result;


        public VariableChooser(Variables vars) : this(vars, null, null) { }

        public VariableChooser(Variables vars, IEnumerable<TypeCode> validCodes, IEnumerable<string> validScopes)
        {
            if (vars == null)
                throw new ArgumentException("Passed a null variables object to variable chooser.");

            _vars = vars;
            InitializeComponent();
            DialogResult = DialogResult.Cancel;
            varList.Items.Clear();

            foreach (Variable v in _vars)
            {
                // Filter by valid codes and validScopes
                if (validCodes != null && !validCodes.Contains<TypeCode>(v.DataType))
                {
                    continue;
                }
                
                if (validScopes!=null && !validScopes.Contains(v.Namespace)) {
                    continue;
                }

                varList.Items.Add(v.QualifiedName);
            }

            if (varList.Items.Count > 0)
                varList.SelectedIndex = 0;
        }

        public void FilterByTypes(IEnumerable<TypeCode> validCodes)
        {
            foreach (Variable v in _vars)
            {
                if (v.DataType == TypeCode.String)
                {
                    varList.Items.Add(v.QualifiedName);
                }
            }
        }

        private void VariableChooser_Load(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            DialogResult = System.Windows.Forms.DialogResult.Cancel;
            _result = null;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (varList.SelectedIndex != -1)
            {
                string cur = varList.Items[varList.SelectedIndex].ToString();
                foreach (Variable v in _vars)
                    if (v.QualifiedName == cur)
                    {
                        _result = v;
                        DialogResult = DialogResult.OK;
                        return;
                    }
            }

            DialogResult = DialogResult.Cancel;
            _result = null;

        }

        public Variable GetResult()
        {
            return _result;
        }
    }
}